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Room-temperature Strong Coupling of Au Nanorod-WSe2 Heterostructures. (arXiv:1704.08094v1 [cond-mat.mes-hall])

April 27th, 2017|Publications|

By Jinxiu Wen, Hao Wang, Huanjun Chen, Shaozhi Deng, Ningsheng Xu

All-solid-state strong light-matter coupling systems with large vacuum Rabi splitting are great important for quantum information application, such as quantum manipulation, quantum information storage and processing. The monolayer transition metal dichalcogenides (TMDs) have been explored as excellent candidates for the strong light-matter interaction, due to their extraordinary exciton binding energies and remarkable optical properties. Here, for both of experimental and theoretical aspects, we explored resonance coupling effect between exciton and plasmonic nanocavity in heterostructures consisting of monolayer tungsten diselenide (WSe2) and an individual Au nanorod. We also study the influences on the resonance coupling of various parameters, including localized surface plasmon resonances of Au nanorods with varied topological aspects, separation between Au nanorod and monolayer WSe2 surface, and the thickness of WSe2. More importantly, the resonance coupling can approach the strong coupling regime at room-temperature by selecting appropriate parameters, where an anti-crossing behavior with the vacuum Rabi splitting strength of 98 meV was observed on the energy diagram.

Published : "arXiv Mesoscale and Nanoscale Physics".

Paths to collapse for isolated skyrmions in few-monolayer ferromagnetic films. (arXiv:1704.08025v1 [cond-mat.mes-hall])

April 27th, 2017|Publications|

By Dusan Stosic, Jeroen Mulkers, Bartel Van Waeyenberge, Teresa Ludermir, Milorad V. Milošević

Magnetic skyrmions are topological spin configurations in materials with chiral Dzyaloshinskii-Moriya interaction (DMI), that are potentially useful for storing or processing information. To date, DMI has been found in few bulk materials, but can also be induced in atomically thin magnetic films in contact with surfaces with large spin-orbit interactions. Recent experiments have reported that isolated magnetic skyrmions can be stabilized even near room temperature in few-atom thick magnetic layers sandwiched between materials that provide asymmetric spin-orbit coupling. Here we present the minimum-energy path analysis of three distinct mechanisms for the skyrmion collapse, based on ab initio input and the performed atomic-spin simulations. We focus on the stability of a skyrmion in three atomic layers of Co, either epitaxial on the Pt(111) surface, or within a hybrid multilayer where DMI nontrivially varies per monolayer due to competition between different symmetry-breaking from two sides of the Co film. In laterally finite systems, their constrained geometry causes poor thermal stability of the skyrmion toward collapse at the boundary, which we show to be resolved by designing the high-DMI structure within an extended film with lower or no DMI.

Published : "arXiv Mesoscale and Nanoscale Physics".

Multilayered intercalation of 1-octanol into Brodie graphite oxide

April 26th, 2017|Publications|

Nanoscale, 2017, Accepted ManuscriptDOI: 10.1039/C7NR01792H, PaperAlexey Klechikov, Jinhua Sun, Igor Baburin, Gottard Seifert, Anastasiya Rebrikova, Natalya V. Avramenko, Mikhail V. Korobov, Alexandr TalyzinMultilayered intercalation of 1-octanol into the structure of Brodie graphite oxide (B-GO) was studied as function of temperature and pressure. Reversible

Published in: "RSC Nanoscale".

Quantum imaging of current flow in graphene

April 26th, 2017|Publications|

By Tetienne, J.-P., Dontschuk, N., Broadway, D. A., Stacey, A., Simpson, D. A., Hollenberg, L. C. L.

Since its first discovery in 2004, graphene has been found to host a plethora of unusual electronic transport phenomena, making it a fascinating system for fundamental studies in condensed matter physics as well as offering tremendous opportunities for future electronic and sensing devices. Typically, electronic transport in graphene has been

Published in: "Science Advances".

Anisotropic Andreev reflection and Josephson effect in ballistic phosphorene

April 26th, 2017|Publications|

By Jacob Linder and Takehito Yokoyama

Author(s): Jacob Linder and Takehito YokoyamaWe study Andreev reflection and the Josephson effect in a ballistic monolayer of black phosphorous, known as phosphorene. Due to the anisotropic band structure of this system, the supercurrent changes with an order of magnitude when comparing tunneling along two perpendicular directions in the monol…[Phys. Rev. B 95, 144515] Published Wed Apr 26, 2017

Published in: "Physical Review B".