Antimonene

/Tag: Antimonene

Van der Waals heteroepitaxial growth of monolayer Sb in puckered honeycomb structure. (arXiv:1903.00641v1 [cond-mat.mtrl-sci])

2019-03-05T02:29:31+00:00March 5th, 2019|Categories: Publications|Tags: |

Atomically thin two-dimensional (2D) crystals have gained tremendous attentions owing to their potential impacts to the future electronics technologies, as well as the exotic phenomena emerging in these materials. Monolayer of {alpha} phase Sb ({alpha}-antimonene) that shares the same puckered structure as black phosphorous, has been predicted to be stable with precious properties. However, the experimental realization still remains challenging. Here, we successfully grow high-quality monolayer {alpha}-antimonene, with the thickness finely controlled. The {alpha}-antimonene exhibits great stability upon exposure to air. Combining scanning tunneling microscope, density functional theory calculations and transport measurement, it is found that the electron band crossing the Fermi level exhibits a linear dispersion with a fairly small effective mass, and thus a good electrical conductivity. All of these properties make the {alpha}-antimonene promising in the future electronic applications.

Published in: "arXiv Material Science".

Valley-engineering mobilities in 2D materials. (arXiv:1902.11209v1 [cond-mat.mtrl-sci])

2019-03-01T02:29:40+00:00March 1st, 2019|Categories: Publications|Tags: , , |

Two-dimensional materials are emerging as a promising platform for ultrathin channels in field-effect transistors. To this aim, novel high-mobility semiconductors need to be found or engineered. While extrinsic mechanisms can in general be minimized by improving fabrication processes, the suppression of intrinsic scattering (driven e.g. by electron-phonon interactions) requires to modify the electronic or vibrational properties of the material. Since intervalley scattering critically affects mobilities, a powerful approach to enhance transport performance relies on engineering the valley structure. We argue here how uniaxial strain can lift degeneracies and completely suppress scattering into entire valleys, dramatically improving performance. This is shown in detail for arsenene, where a 2% strain blocks scattering into 4 of the 6 valleys, and leads to a 600% increase in mobility. The mechanism is general and applies to other materials, including in particular the isostructural antimonene and blue phosphorene.

Published in: "arXiv Material Science".

Electron-phonon properties, structural stability, and superconductivity of doped antimonene

2019-02-27T14:35:02+00:00February 27th, 2019|Categories: Publications|Tags: |

Author(s): A. V. Lugovskoi, M. I. Katsnelson, and A. N. RudenkoAntimonene is a recently discovered two-dimensional semiconductor with exceptional environmental stability, high carrier mobility, and strong spin-orbit interactions. In combination with an electric field, the latter provides an additional degree of control over the material’s properties because of …[Phys. Rev. B 99, 064513] Published Wed Feb 27, 2019

Published in: "Physical Review B".

Antimonene: Van der Waals Heteroepitaxial Growth of Monolayer Sb in a Puckered Honeycomb Structure (Adv. Mater. 5/2019)

2019-02-04T02:38:46+00:00February 4th, 2019|Categories: Publications|Tags: , |

In article number 1806130, Wenguang Zhu, Shao‐Chun Li, and co‐workers describe the fabrication of monolayer α‐phase antimonene, a structural analog to black phosphorous, on a WTe2 substrate by molecular beam epitaxy. The α‐antimonene exhibits great stability upon exposure to air. Its electron band, crossing the Fermi level, exhibits a linear dispersion with a fairly small effective mass, and thus, a good electrical conductivity. All of these properties make α‐antimonene promising for future electronic applications.

Published in: "Advanced Materials".

Antimonene: Van der Waals Heteroepitaxial Growth of Monolayer Sb in a Puckered Honeycomb Structure (Adv. Mater. 5/2019)

2019-02-02T22:36:40+00:00February 2nd, 2019|Categories: Publications|Tags: , |

In article number 1806130, Wenguang Zhu, Shao‐Chun Li, and co‐workers describe the fabrication of monolayer α‐phase antimonene, a structural analog to black phosphorous, on a WTe2 substrate by molecular beam epitaxy. The α‐antimonene exhibits great stability upon exposure to air. Its electron band, crossing the Fermi level, exhibits a linear dispersion with a fairly small effective mass, and thus, a good electrical conductivity. All of these properties make α‐antimonene promising for future electronic applications.

Published in: "Advanced Materials".

Atomically Thin 2D‐Arsenene by Liquid‐Phased Exfoliation: Toward Selective Vapor Sensing

2019-02-02T22:32:35+00:00February 2nd, 2019|Categories: Publications|Tags: , , |

A liquid‐phase exfoliation procedure to prepare 2D‐arsenene via sonication is reported, and the formation of high‐quality few‐layer arsenene nanosheets with large lateral dimensions is confirmed. A vapor sensing using arsenene nanosheets is demonstrated, which can selectively detect methanol or acetone vapors depending on the selected resonance frequency. The results are highly reproducible, and the sensor has long‐term stability. Abstract Phosphorene and antimonene, single‐ or few‐layered (FL) semiconductor materials, have recently attracted enormous attention due to their unique properties, provided by their extreme thinness. Here, a liquid‐phase exfoliation (LPE) procedure to prepare FL arsenene, another member of pnictogens, assisted by sonication and without any additional surfactant is reported. The exfoliation process is performed in various solvents. Among those, N‐methylpyrrolidone is found to provide the highest concentration of stable arsenene sheets. Spectroscopic and microscopic analyses confirm the formation of high‐quality few‐layer arsenene nanosheets with large lateral dimensions. An application of this material for construction of vapor sensor based on electrochemical impedance spectroscopy is demonstrated. The device detects selectively methanol or acetone vapors depending on the selected resonance frequency. The results are highly reproducible, and the vapor sensor has long‐term stability.

Published in: "Advanced Functional Materials".

Antimonene: Van der Waals Heteroepitaxial Growth of Monolayer Sb in a Puckered Honeycomb Structure (Adv. Mater. 5/2019)

2019-02-02T08:37:03+00:00February 2nd, 2019|Categories: Publications|Tags: , |

In article number 1806130, Wenguang Zhu, Shao‐Chun Li, and co‐workers describe the fabrication of monolayer α‐phase antimonene, a structural analog to black phosphorous, on a WTe2 substrate by molecular beam epitaxy. The α‐antimonene exhibits great stability upon exposure to air. Its electron band, crossing the Fermi level, exhibits a linear dispersion with a fairly small effective mass, and thus, a good electrical conductivity. All of these properties make α‐antimonene promising for future electronic applications.

Published in: "Advanced Materials".

Ultrafast diffusive cross-sheet motion of lithium through antimonene with a 2+1 dimensional kinetics. (arXiv:1901.07193v1 [cond-mat.mtrl-sci])

2019-01-23T02:29:27+00:00January 23rd, 2019|Categories: Publications|Tags: , , |

Layered two-dimensional materials like graphene are highly appealing for lithium battery applications owing to their high surface-volume ratios. However, a critical issue that limits their practical applications is the confined motion of lithium atoms within their van der Waal’s gaps, which is the leading cause for battery failure due to severe clustering and phase separation. Here we demonstrate that antimonene, an exfoliatable 2D material with a high structural stability, exhibits a highly mobile cross-sheet motion owing to its unique structural features. The advent of the vertically permeable channels opens a new pathway of lithium besides the normal motion along the basal plane, rendering a 2+1 dimensional kinetics. Specifically, our first-principles calculations combined with the discrete geometry analysis revealed that the energy barrier for a lithium atom to diffuse across the antimonene sheet is as low as 0.36 eV, which can be further reduced to 0.18 eV under a tensile strain of 4%. These ultralow diffusion barriers across the sheet can open a new dimension for controlling the motion of lithium atoms, leading to a new paradigm for high-performance lithium batteries or inorganic solid-state lithium-ion conductors.

Published in: "arXiv Material Science".

Robust Above‐Room‐Temperature Ferromagnetism in Few‐Layer Antimonene Triggered by Nonmagnetic Adatoms

2019-01-21T22:32:56+00:00January 21st, 2019|Categories: Publications|Tags: |

Taking fluorinated antimonene (F‐antimonene) as an example, it is proven that robust ferromagnetic order can be achieved in 2D van der Waals crystals via nonmagnetic doping. The syntheiszed F‐antimonene demostrates a Curie tempearture of up to 717 K, promising for practical spintronic applications. Density functional theory reveals that the long‐range ferromagnetism in F‐antimonene is induced by sp‐electron‐polarized impurity subbands. Abstract 2D ferromagnets have attracted considerable attention due to their strong potential in the post‐Moore Law era. However, intrinsic 2D ferromagnetic materials typically suffer from suppressed Curie temperature due to thermal fluctuation, magnetic order instability in the 2D limit, and others. Herein, a nonmagnetic fluorine modification strategy is proposed to control the ferromagnetism of air‐stable antimonene. It is demonstrated that fluorinated antimonene (F‐antimonene), synthesized via an electrochemical exfoliation and synchronous fluorination method, exhibits robust ferromagnetism with a Curie temperature of up to 717 K (compared with a Curie temperature of 220 K for pristine antimonene) and a saturation magnetization of ≈0.1 emu g−1 (determined by the fluorination degree). First‐principles simulations confirm that the robust long‐range ferromagnetic order in the half‐metallic F‐antimonene is induced by the low‐density sp‐electron‐polarized impurity subbands. The study constitutes a nonmagnetic control of robust above‐room‐temperature ferromagnetism in monoelemental 2D semiconductors and paves a new route toward 2D atomic layer‐based spin devices.

Published in: "Advanced Functional Materials".

Robust Above‐Room‐Temperature Ferromagnetism in Few‐Layer Antimonene Triggered by Nonmagnetic Adatoms

2019-01-21T20:33:20+00:00January 21st, 2019|Categories: Publications|Tags: |

Taking fluorinated antimonene (F‐antimonene) as an example, it is proven that robust ferromagnetic order can be achieved in 2D van der Waals crystals via nonmagnetic doping. The syntheiszed F‐antimonene demostrates a Curie tempearture of up to 717 K, promising for practical spintronic applications. Density functional theory reveals that the long‐range ferromagnetism in F‐antimonene is induced by sp‐electron‐polarized impurity subbands. Abstract 2D ferromagnets have attracted considerable attention due to their strong potential in the post‐Moore Law era. However, intrinsic 2D ferromagnetic materials typically suffer from suppressed Curie temperature due to thermal fluctuation, magnetic order instability in the 2D limit, and others. Herein, a nonmagnetic fluorine modification strategy is proposed to control the ferromagnetism of air‐stable antimonene. It is demonstrated that fluorinated antimonene (F‐antimonene), synthesized via an electrochemical exfoliation and synchronous fluorination method, exhibits robust ferromagnetism with a Curie temperature of up to 717 K (compared with a Curie temperature of 220 K for pristine antimonene) and a saturation magnetization of ≈0.1 emu g−1 (determined by the fluorination degree). First‐principles simulations confirm that the robust long‐range ferromagnetic order in the half‐metallic F‐antimonene is induced by the low‐density sp‐electron‐polarized impurity subbands. The study constitutes a nonmagnetic control of robust above‐room‐temperature ferromagnetism in monoelemental 2D semiconductors and paves a new route toward 2D atomic layer‐based spin devices.

Published in: "Advanced Functional Materials".

Robust Above‐Room‐Temperature Ferromagnetism in Few‐Layer Antimonene Triggered by Nonmagnetic Adatoms

2019-01-21T20:33:21+00:00January 21st, 2019|Categories: Publications|Tags: |

Taking fluorinated antimonene (F‐antimonene) as an example, it is proven that robust ferromagnetic order can be achieved in 2D van der Waals crystals via nonmagnetic doping. The syntheiszed F‐antimonene demostrates a Curie tempearture of up to 717 K, promising for practical spintronic applications. Density functional theory reveals that the long‐range ferromagnetism in F‐antimonene is induced by sp‐electron‐polarized impurity subbands. Abstract 2D ferromagnets have attracted considerable attention due to their strong potential in the post‐Moore Law era. However, intrinsic 2D ferromagnetic materials typically suffer from suppressed Curie temperature due to thermal fluctuation, magnetic order instability in the 2D limit, and others. Herein, a nonmagnetic fluorine modification strategy is proposed to control the ferromagnetism of air‐stable antimonene. It is demonstrated that fluorinated antimonene (F‐antimonene), synthesized via an electrochemical exfoliation and synchronous fluorination method, exhibits robust ferromagnetism with a Curie temperature of up to 717 K (compared with a Curie temperature of 220 K for pristine antimonene) and a saturation magnetization of ≈0.1 emu g−1 (determined by the fluorination degree). First‐principles simulations confirm that the robust long‐range ferromagnetic order in the half‐metallic F‐antimonene is induced by the low‐density sp‐electron‐polarized impurity subbands. The study constitutes a nonmagnetic control of robust above‐room‐temperature ferromagnetism in monoelemental 2D semiconductors and paves a new route toward 2D atomic layer‐based spin devices.

Published in: "Advanced Functional Materials".

Robust Above‐Room‐Temperature Ferromagnetism in Few‐Layer Antimonene Triggered by Nonmagnetic Adatoms

2019-01-21T10:33:11+00:00January 21st, 2019|Categories: Publications|Tags: |

Taking fluorinated antimonene (F‐antimonene) as an example, it is proven that robust ferromagnetic order can be achieved in 2D van der Waals crystals via nonmagnetic doping. The syntheiszed F‐antimonene demostrates a Curie tempearture of up to 717 K, promising for practical spintronic applications. Density functional theory reveals that the long‐range ferromagnetism in F‐antimonene is induced by sp‐electron‐polarized impurity subbands. Abstract 2D ferromagnets have attracted considerable attention due to their strong potential in the post‐Moore Law era. However, intrinsic 2D ferromagnetic materials typically suffer from suppressed Curie temperature due to thermal fluctuation, magnetic order instability in the 2D limit, and others. Herein, a nonmagnetic fluorine modification strategy is proposed to control the ferromagnetism of air‐stable antimonene. It is demonstrated that fluorinated antimonene (F‐antimonene), synthesized via an electrochemical exfoliation and synchronous fluorination method, exhibits robust ferromagnetism with a Curie temperature of up to 717 K (compared with a Curie temperature of 220 K for pristine antimonene) and a saturation magnetization of ≈0.1 emu g−1 (determined by the fluorination degree). First‐principles simulations confirm that the robust long‐range ferromagnetic order in the half‐metallic F‐antimonene is induced by the low‐density sp‐electron‐polarized impurity subbands. The study constitutes a nonmagnetic control of robust above‐room‐temperature ferromagnetism in monoelemental 2D semiconductors and paves a new route toward 2D atomic layer‐based spin devices.

Published in: "Advanced Functional Materials".

Atomically Thin 2D‐Arsenene by Liquid‐Phased Exfoliation: Toward Selective Vapor Sensing

2018-12-20T04:32:38+00:00December 20th, 2018|Categories: Publications|Tags: , , |

A liquid‐phase exfoliation procedure to prepare 2D‐arsenene via sonication is reported, and the formation of high‐quality few‐layer arsenene nanosheets with large lateral dimensions is confirmed. A vapor sensing using arsenene nanosheets is demonstrated, which can selectively detect methanol or acetone vapors depending on the selected resonance frequency. The results are highly reproducible, and the sensor has long‐term stability. Abstract Phosphorene and antimonene, single‐ or few‐layered (FL) semiconductor materials, have recently attracted enormous attention due to their unique properties, provided by their extreme thinness. Here, a liquid‐phase exfoliation (LPE) procedure to prepare FL arsenene, another member of pnictogens, assisted by sonication and without any additional surfactant is reported. The exfoliation process is performed in various solvents. Among those, N‐methylpyrrolidone is found to provide the highest concentration of stable arsenene sheets. Spectroscopic and microscopic analyses confirm the formation of high‐quality few‐layer arsenene nanosheets with large lateral dimensions. An application of this material for construction of vapor sensor based on electrochemical impedance spectroscopy is demonstrated. The device detects selectively methanol or acetone vapors depending on the selected resonance frequency. The results are highly reproducible, and the vapor sensor has long‐term stability.

Published in: "Advanced Functional Materials".

Van der Waals Heteroepitaxial Growth of Monolayer Sb in a Puckered Honeycomb Structure

2018-12-15T22:33:29+00:00December 15th, 2018|Categories: Publications|Tags: , |

Monolayer α‐phase antimonene, a structural analog to black phosphorous, is fabricated on a WTe2 substrate. The α‐antimonene exhibits great stability upon exposure to air. Its electron band crossing the Fermi level exhibits a linear dispersion with a fairly small effective mass, and thus a good electrical conductivity. All of these properties make α‐antimonene promising in the future electronic applications. Abstract Atomically thin 2D crystals have gained tremendous attention owing to their potential impact on future electronics technologies, as well as the exotic phenomena emerging in these materials. Monolayers of α‐phase Sb (α‐antimonene), which shares the same puckered structure as black phosphorous, are predicted to be stable with precious properties. However, the experimental realization still remains challenging. Here, high‐quality monolayerα‐antimonene is successfully grown, with the thickness finely controlled. The α‐antimonene exhibits great stability upon exposure to air. Combining scanning tunneling microscopy, density functional theory calculations, and transport measurements, it is found that the electron band crossing the Fermi level exhibits a linear dispersion with a fairly small effective mass, and thus a good electrical conductivity. All of these properties make the α‐antimonene promising for future electronic applications.

Published in: "Advanced Materials".

Atomically Thin 2D‐Arsenene by Liquid‐Phased Exfoliation: Toward Selective Vapor Sensing

2018-12-13T10:32:11+00:00December 13th, 2018|Categories: Publications|Tags: , , |

A liquid‐phase exfoliation procedure to prepare 2D‐arsenene via sonication is reported, and the formation of high‐quality few‐layer arsenene nanosheets with large lateral dimensions is confirmed. A vapor sensing using arsenene nanosheets is demonstrated, which can selectively detect methanol or acetone vapors depending on the selected resonance frequency. The results are highly reproducible, and the sensor has long‐term stability. Abstract Phosphorene and antimonene, single‐ or few‐layered (FL) semiconductor materials, have recently attracted enormous attention due to their unique properties, provided by their extreme thinness. Here, a liquid‐phase exfoliation (LPE) procedure to prepare FL arsenene, another member of pnictogens, assisted by sonication and without any additional surfactant is reported. The exfoliation process is performed in various solvents. Among those, N‐methylpyrrolidone is found to provide the highest concentration of stable arsenene sheets. Spectroscopic and microscopic analyses confirm the formation of high‐quality few‐layer arsenene nanosheets with large lateral dimensions. An application of this material for construction of vapor sensor based on electrochemical impedance spectroscopy is demonstrated. The device detects selectively methanol or acetone vapors depending on the selected resonance frequency. The results are highly reproducible, and the vapor sensor has long‐term stability.

Published in: "Advanced Functional Materials".

Protective layer enhanced the stability and superconductivity of tailored antimonene bilayer. (arXiv:1812.04927v1 [cond-mat.mtrl-sci])

2018-12-13T02:29:27+00:00December 13th, 2018|Categories: Publications|Tags: , , |

For two-dimensional superconductors, the high stability in ambient conditions is critical for experiments and applications. Few-layer antimonene can be non-degradative over a couple of months, which is superior to the akin black phosphorus. Based on the anisotropic Migdal-Eliashberg theory and maximally-localised Wannier functions, this work predicts that electron-doping and Ca-intercalation can transform $beta$-Sb bilayer from a semimetal to a superconductor. However, the stability of antimonene bilayer in air trends to be decreased due to the electron doping. To overcome this drawback, two kinds of protective layers (graphene and $h$-BN) are proposed to enhance the stability. Interestingly, the superconducting transition temperature will also be enhanced to $9.6$ K, making it a promising candidate as nanoscale superconductor.

Published in: "arXiv Material Science".

Van der Waals Heteroepitaxial Growth of Monolayer Sb in a Puckered Honeycomb Structure

2018-12-13T00:34:12+00:00December 12th, 2018|Categories: Publications|Tags: , |

Monolayer α‐phase antimonene, a structural analog to black phosphorous, is fabricated on a WTe2 substrate. The α‐antimonene exhibits great stability upon exposure to air. Its electron band crossing the Fermi level exhibits a linear dispersion with a fairly small effective mass, and thus a good electrical conductivity. All of these properties make α‐antimonene promising in the future electronic applications. Abstract Atomically thin 2D crystals have gained tremendous attention owing to their potential impact on future electronics technologies, as well as the exotic phenomena emerging in these materials. Monolayers of α‐phase Sb (α‐antimonene), which shares the same puckered structure as black phosphorous, are predicted to be stable with precious properties. However, the experimental realization still remains challenging. Here, high‐quality monolayerα‐antimonene is successfully grown, with the thickness finely controlled. The α‐antimonene exhibits great stability upon exposure to air. Combining scanning tunneling microscopy, density functional theory calculations, and transport measurements, it is found that the electron band crossing the Fermi level exhibits a linear dispersion with a fairly small effective mass, and thus a good electrical conductivity. All of these properties make the α‐antimonene promising for future electronic applications.

Published in: "Advanced Materials".

Van der Waals Heteroepitaxial Growth of Monolayer Sb in a Puckered Honeycomb Structure

2018-12-05T18:34:36+00:00December 5th, 2018|Categories: Publications|Tags: , |

Monolayer α‐phase antimonene, a structural analog to black phosphorous, is fabricated on a WTe2 substrate. The α‐antimonene exhibits great stability upon exposure to air. Its electron band crossing the Fermi level exhibits a linear dispersion with a fairly small effective mass, and thus a good electrical conductivity. All of these properties make α‐antimonene promising in the future electronic applications. Abstract Atomically thin 2D crystals have gained tremendous attention owing to their potential impact on future electronics technologies, as well as the exotic phenomena emerging in these materials. Monolayers of α‐phase Sb (α‐antimonene), which shares the same puckered structure as black phosphorous, are predicted to be stable with precious properties. However, the experimental realization still remains challenging. Here, high‐quality monolayerα‐antimonene is successfully grown, with the thickness finely controlled. The α‐antimonene exhibits great stability upon exposure to air. Combining scanning tunneling microscopy, density functional theory calculations, and transport measurements, it is found that the electron band crossing the Fermi level exhibits a linear dispersion with a fairly small effective mass, and thus a good electrical conductivity. All of these properties make the α‐antimonene promising for future electronic applications.

Published in: "Advanced Materials".

Gate-tunable infrared plasmons in electron-doped single-layer antimony

2018-11-09T16:34:02+00:00November 9th, 2018|Categories: Publications|Tags: |

Author(s): D. A. Prishchenko, V. G. Mazurenko, M. I. Katsnelson, and A. N. RudenkoWe report on a theoretical study of collective electronic excitations in single-layer antimony crystals (antimonene), a novel two-dimensional semiconductor with strong spin-orbit coupling. Based on a tight-binding model, we consider electron-doped antimonene and demonstrate that the combination of s…[Phys. Rev. B 98, 201401(R)] Published Fri Nov 09, 2018

Published in: "Physical Review B".

Testing topological protection of edge states in hexagonal quantum spin Hall candidate materials

2018-10-23T16:34:39+00:00October 23rd, 2018|Categories: Publications|Tags: , |

Author(s): Fernando Dominguez, Benedikt Scharf, Gang Li, Jörg Schäfer, Ralph Claessen, Werner Hanke, Ronny Thomale, and Ewelina M. HankiewiczWe analyze the detailed structure of topological edge mode protection occurring in hexagonal quantum spin Hall (QSH) materials. We focus on bismuthene, antimonene, and arsenene on a SiC substrate, which, due to their large bulk gap, may offer new opportunities for room-temperature QSH applications. …[Phys. Rev. B 98, 161407(R)] Published Tue Oct 23, 2018

Published in: "Physical Review B".

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