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Valley Carrier Dynamics in Monolayer Molybdenum Disulphide from Helicity Resolved Ultrafast Pump-probe Spectroscopy
Qinsheng Wang, Shaofeng Ge, Xiao Li +4
We investigate the valley related carrier dynamics in monolayer MoS2 using helicity resolved non-degenerate ultrafast pump-probe spectroscopy at the vicinity of the high-symmetry K…
Designer Topological Insulators in Superlattices
Xiao Li, Fan Zhang, Qian Niu +1
Gapless Dirac surface states are protected at the interface of topological and normal band insulators. In a binary superlattice bearing such interfaces, we establish that valley-de…
Emergent topological and half semimetallic Dirac Fermions at oxide interfaces
Tian-Yi Cai, Xiao Li, Fa Wang +3
It is highly desirable to combine recent advances in the topological quantum phases with technologically relevant materials. Chromium dioxide (CrO2) is a half-metallic material, wi…
Zeeman Field-Tuned Transitions for Surface Chern Insulators
Fan Zhang, Xiao Li, Ji Feng +2
Mirror symmetric surfaces of a topological crystalline insulator host even number of Dirac surface states. A surface Zeeman field generically gaps these states leading to a quantiz…
Tailoring exciton dynamics by elastic strain-gradient in semiconductors
Xuewen Fu, Cong Su, Qiang Fu +7
As device miniaturization approaches the atomic limit, it becomes highly desirable to exploit novel paradigms for tailoring electronic structures and carrier dynamics in materials.…