Identification of spin, valley and moiré quasi-angular momentum of interlayer excitons

2019-08-26T17:00:00+00:00August 26th, 2019|Categories: Publications|

Nature Physics, Published online: 26 August 2019; doi:10.1038/s41567-019-0631-4Stacked 2D materials can host excitons with distinct valley selection rules due to the spatial variation of the moiré pattern. The authors demonstrate this via optical spectroscopy, opening a route for control of optoelectronic devices.

Published in: "Nature Physics".

Electronic correlations in twisted bilayer graphene near the magic angle

2019-08-05T16:50:12+00:00August 5th, 2019|Categories: Publications|Tags: |

Nature Physics, Published online: 05 August 2019; doi:10.1038/s41567-019-0606-5Scanning tunnelling microscopy shows that electrons in twisted bilayer graphene are strongly correlated for a wide range of density. In particular, a correlated regime appears near charge neutrality and theory suggests nematic ordering.

Published in: "Nature Physics".

A needle in a moiré stack

2019-08-05T16:50:04+00:00August 5th, 2019|Categories: Publications|Tags: |

Nature Physics, Published online: 05 August 2019; doi:10.1038/s41567-019-0645-ySpatially resolved measurements of twisted bilayer graphene reveal more details of the strongly correlated electrons.

Published in: "Nature Physics".

Disorder-induced multifractal superconductivity in monolayer niobium dichalcogenides

2019-07-15T16:38:47+00:00July 15th, 2019|Categories: Publications|Tags: |

Nature Physics, Published online: 15 July 2019; doi:10.1038/s41567-019-0570-0Disorder present in monolayer NbSe2 is found to be able to enhance its superconductivity. A systematic study reveals the origin—disorder-induced multifractality of the electron wavefunctions strengthens the local interactions.

Published in: "Nature Physics".

Pairing states of composite fermions in double-layer graphene

2019-06-24T19:07:55+00:00June 24th, 2019|Categories: Publications|Tags: |

Nature Physics, Published online: 24 June 2019; doi:10.1038/s41567-019-0547-zIt is shown that composite fermions in the fractional quantum Hall regime form paired states in double-layer graphene. Pairing between layers gives a phase similar to an exciton condensate and pairing within a layer may lead to non-abelian states.

Published in: "Nature Physics".

Symmetry-enforced chiral hinge states and surface quantum anomalous Hall effect in the magnetic axion insulator Bi<sub>2–x</sub>Sm<sub>x</sub>Se<sub>3</sub>

2019-03-18T18:34:43+00:00March 18th, 2019|Categories: Publications|Tags: |

Symmetry-enforced chiral hinge states and surface quantum anomalous Hall effect in the magnetic axion insulator Bi2–xSmxSe3Symmetry-enforced chiral hinge states and surface quantum anomalous Hall effect in the magnetic axion insulator Bi<sub>2–x</sub>Sm<sub>x</sub>Se<sub>3</sub>, Published online: 18 March 2019; doi:10.1038/s41567-019-0457-0The second-order topological states—chiral hinge states—are predicted in axion insulators, ferromagnetic insulating materials with quantized electromagnetic response. The authors predict such states to occur in Sm-doped Bi2Se3.

Published in: "Nature Physics".

Acoustic Landau quantization and quantum-Hall-like edge states

2019-03-04T16:34:56+00:00March 4th, 2019|Categories: Publications|Tags: |

Acoustic Landau quantization and quantum-Hall-like edge statesAcoustic Landau quantization and quantum-Hall-like edge states, Published online: 04 March 2019; doi:10.1038/s41567-019-0446-3A graphene-like two-dimensional sonic crystal, under uniaxial deformation, experiences a giant uniform pseudomagnetic field. This leads to the quantization of the cyclotron orbits—a kind of acoustic Landau level—that is observed here.

Published in: "Nature Physics".

Dimensional reduction, quantum Hall effect and layer parity in graphite films

2019-02-25T16:41:31+00:00February 25th, 2019|Categories: Publications|

Dimensional reduction, quantum Hall effect and layer parity in graphite filmsDimensional reduction, quantum Hall effect and layer parity in graphite films, Published online: 25 February 2019; doi:10.1038/s41567-019-0427-6The quantum Hall effect is thought to exist only in two-dimensional materials. Here, transport measurements show that thin graphite slabs have a 2.5-dimensional version, with a parity effect for samples with odd and even number of layers.

Published in: "Nature Physics".

Far out-of-equilibrium spin populations trigger giant spin injection into atomically thin MoS<sub>2</sub>

2019-01-21T18:36:40+00:00January 21st, 2019|Categories: Publications|Tags: |

Far out-of-equilibrium spin populations trigger giant spin injection into atomically thin MoS2Far out-of-equilibrium spin populations trigger giant spin injection into atomically thin MoS<sub>2</sub>, Published online: 21 January 2019; doi:10.1038/s41567-018-0406-3Efficient spin injection across ferromagnet/semiconductor interfaces is a major goal for future spintronic approaches. Ultrafast spectroscopy now reveals strong spin currents to be inducible in monolayer MoS2 by ultralow-intensity laser pulses.

Published in: "Nature Physics".

Evidence of a gate-tunable Mott insulator in a trilayer graphene moiré superlattice

2019-01-21T15:43:53+00:00January 21st, 2019|Categories: Publications|Tags: |

Evidence of a gate-tunable Mott insulator in a trilayer graphene moiré superlatticeEvidence of a gate-tunable Mott insulator in a trilayer graphene moiré superlattice, Published online: 21 January 2019; doi:10.1038/s41567-018-0387-2Report of the likely observation of a Mott insulator in trilayer graphene with a moiré potential. The Mott state can be tuned between different filling fractions via gating, which will enable the careful study of this paradigmatic many-body state.

Published in: "Nature Physics".

Exchange-driven intravalley mixing of excitons in monolayer transition metal dichalcogenides

2018-12-10T16:34:40+00:00December 10th, 2018|Categories: Publications|Tags: |

Exchange-driven intravalley mixing of excitons in monolayer transition metal dichalcogenidesExchange-driven intravalley mixing of excitons in monolayer transition metal dichalcogenides, Published online: 10 December 2018; doi:10.1038/s41567-018-0362-yTwo-dimensional electronic spectroscopy experiments and first-principles many-electron calculations demonstrate the quantum mixing of different exciton states in monolayer MoS2. This reveals the many-body effects and dynamics of exciton formation in 2D materials.

Published in: "Nature Physics".

Entanglement of single-photons and chiral phonons in atomically thin WSe<sub>2</sub>

2018-12-10T16:34:38+00:00December 10th, 2018|Categories: Publications|Tags: |

Entanglement of single-photons and chiral phonons in atomically thin WSe2Entanglement of single-photons and chiral phonons in atomically thin WSe<sub>2</sub>, Published online: 10 December 2018; doi:10.1038/s41567-018-0366-7A ‘which-way’ scattering process can generate entanglement between single photons and collective chiral vibrations in two-dimensional tungsten diselenide. The result opens up ways for engineering non-reciprocal interactions at the quantum level.

Published in: "Nature Physics".

Even denominator fractional quantum Hall states in higher Landau levels of graphene

2018-11-26T18:34:49+00:00November 26th, 2018|Categories: Publications|Tags: |

Even denominator fractional quantum Hall states in higher Landau levels of grapheneEven denominator fractional quantum Hall states in higher Landau levels of graphene, Published online: 26 November 2018; doi:10.1038/s41567-018-0355-xNew fractional quantum Hall states are observed in a higher Landau level in graphene. Calculations indicate that a non-Abelian parton state is the most likely candidate state, which has implications for topological quantum computation.

Published in: "Nature Physics".

Author Correction: Even-denominator fractional quantum Hall states at an isospin transition in monolayer graphene

2018-10-29T16:35:25+00:00October 29th, 2018|Categories: Publications|Tags: |

Author Correction: Even-denominator fractional quantum Hall states at an isospin transition in monolayer grapheneAuthor Correction: Even-denominator fractional quantum Hall states at an isospin transition in monolayer graphene, Published online: 29 October 2018; doi:10.1038/s41567-018-0344-0Author Correction: Even-denominator fractional quantum Hall states at an isospin transition in monolayer graphene

Published in: "Nature Physics".

Excess resistivity in graphene superlattices caused by umklapp electron–electron scattering

2018-10-15T16:38:58+00:00October 15th, 2018|Categories: Publications|Tags: |

Excess resistivity in graphene superlattices caused by umklapp electron–electron scatteringExcess resistivity in graphene superlattices caused by umklapp electron–electron scattering, Published online: 15 October 2018; doi:10.1038/s41567-018-0278-6An increase in electrical resistance caused by the fundamental process of electrons scattering off of each other (umklapp scattering) is observed in graphene superlattice devices. This will limit the electrical properties of such devices.

Published in: "Nature Physics".

Biexcitonic optical Stark effects in monolayer molybdenum diselenide

2018-07-30T16:34:21+00:00July 30th, 2018|Categories: Publications|Tags: |

Biexcitonic optical Stark effects in monolayer molybdenum diselenideBiexcitonic optical Stark effects in monolayer molybdenum diselenide, Published online: 30 July 2018; doi:10.1038/s41567-018-0216-7Light–matter interactions in monolayer MoSe2 can be dramatically modified by the interactions between the excitonic states, leading to a rich set of light-driven coherent phenomena.

Published in: "Nature Physics".

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