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Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides.
- Di Xiao, Gui-Bin Liu, W. Feng, Xiaodong Xu, W. Yao
- Physics, MedicinePhysical review letters
- 14 December 2011
We show that inversion symmetry breaking together with spin-orbit coupling leads to coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides, making possible controls…
Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides
We present a three-band tight-binding (TB) model for describing the low-energy physics in monolayers of group-VIB transition metal dichalcogenides MX2 (M = Mo, W; X = S, Se, Te). As the conduction-…
Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides
The efficiency of second harmonic generation shows a dramatic even-odd oscillation with the number of layers, consistent with the presence (absence) of inversion symmetry in even-layer (odd-layer) and the giant spin-valley coupling which fully suppresses interlayer hopping at valence band edge near K points.
Moiré excitons: From programmable quantum emitter arrays to spin-orbit–coupled artificial lattices
- Hongyi Yu, Gui-Bin Liu, Jianju Tang, Xiaodong Xu, W. Yao
- Physics, MedicineScience Advances
- 19 October 2017
It is found that the moiré hosts complex hopping honeycomb superlattices, where exciton bands feature a Dirac node and two Weyl nodes, connected by spin-momentum–locked topological edge modes, which underlies the SOC when hopping couples nanodots into superlATTices.
Magnetoelectric effects and valley-controlled spin quantum gates in transition metal dichalcogenide bilayers.
It is shown how to realize quantum gates on the spin qubit controlled by the valley bit, making an interplay between the spin and valley as information carriers possible for potential valley-spintronic applications.
Dirac cones and Dirac saddle points of bright excitons in monolayer transition metal dichalcogenides.
- Hongyi Yu, Gui-Bin Liu, Pu Gong, Xiaodong Xu, W. Yao
- Physics, MedicineNature communications
- 12 May 2014
The strain-tunable valley-orbit coupling implies new structures of exciton condensates, new functionalities of excitonic circuits and mechanical control of valley pseudospin, which point to unique opportunities to study Dirac physics.
Electronic structures and theoretical modelling of two-dimensional group-VIB transition metal dichalcogenides.
- Gui-Bin Liu, Di Xiao, Yugui Yao, Xiaodong Xu, W. Yao
- Physics, MedicineChemical Society reviews
- 28 April 2015
The bulk electronic structures of these new 2D TMD materials as well as the theoretical models developed at different levels are reviewed, along which the understanding of the origins of a variety of properties observed or predicted is sort out.
Observation of intervalley quantum interference in epitaxial monolayer tungsten diselenide
This work reports the experimental observation of quasi-particle interference patterns in monolayer WSe2 using low-temperature scanning tunnelling spectroscopy, and establishes unequivocally the presence of spin–valley coupling and affirm the large spin splitting at the Q valleys.
Brightened spin-triplet interlayer excitons and optical selection rules in van der Waals heterobilayers
We investigate the optical properties of spin-triplet interlayer excitons in heterobilayer transition metal dichalcogenides in comparison with the spin-singlet ones. Surprisingly, the optical…