Selective scattering between Floquet–Bloch and Volkov states in a topological insulator
- F. Mahmood, Ching-Kit Chan, N. Gedik
- Physics
- 17 December 2015
Time- and angle-resolved photoelectron spectroscopy experiments are used to monitor the transition between Floquet–Bloch and Volkov states in the topological insulator Bi2Se3. The coherent optical…
Direct optical detection of Weyl fermion chirality in a topological semimetal
- Q. Ma, Su-Yang Xu, N. Gedik
- Physics
- 1 May 2017
Measuring the photocurrent response to circularly polarized mid-infrared light provides direct access to the chirality of Weyl fermions in Weyl semimetals — the property responsible for a range of…
Photocurrents in Weyl semimetals
- Ching-Kit Chan, N. Lindner, G. Refael, P. Lee
- Physics
- 26 July 2016
The generation of photocurrent in an ideal two-dimensional Dirac spectrum is symmetry forbidden. In sharp contrast, we show that three-dimensional Weyl semimetals can generically support significant…
Electrically switchable Berry curvature dipole in the monolayer topological insulator WTe2
- Su-Yang Xu, Q. Ma, P. Jarillo-Herrero
- PhysicsNature Physics
- 6 March 2018
Recent experimental evidence for the quantum spin Hall (QSH) state in monolayer WTe2 has linked the fields of two-dimensional materials and topological physics1–7. This two-dimensional topological…
Entanglement tongue and quantum synchronization of disordered oscillators.
- Tony E. Lee, Ching-Kit Chan, Shenshen Wang
- PhysicsPhysical review. E, Statistical, nonlinear, and…
- 12 December 2013
The synchronization of dissipatively coupled van der Pol oscillators in the quantum limit is studied, when each oscillator is near its quantum ground state and the critical coupling increases with detuning.
Dissipative phase transitions: Independent versus collective decay and spin squeezing
- Tony E. Lee, Ching-Kit Chan, S. Yelin
- Physics
- 28 August 2014
We study the XY model with infinite-range interactions (Lipkin-Meshkov-Glick model) in the presence of dissipation from spontaneous decay. We show that independent and collective decay lead to…
Limit-cycle phase in driven-dissipative spin systems
- Ching-Kit Chan, Tony E. Lee, S. Gopalakrishnan
- Physics
- 5 January 2015
We explore the phase diagram of interacting spin-$1/2$ systems in the presence of anisotropic interactions, spontaneous decay and driving. We find a rich phase diagram featuring a limit cycle phase…
Anticrossing of chiral Landau levels in Dirac and Weyl semimetals
- Ching-Kit Chan, P. Lee
- Physics
- 22 August 2017
Heralded Magnetism in Non-Hermitian Atomic Systems
- Tony E. Lee, Ching-Kit Chan
- Physics
- 26 February 2014
Quantum phase transitions are usually studied in terms of Hermitian Hamiltonians. However, cold-atom experiments are intrinsically non-Hermitian due to spontaneous decay. Here, we show that…
When Chiral Photons Meet Chiral Fermions: Photoinduced Anomalous Hall Effects in Weyl Semimetals.
- Ching-Kit Chan, P. Lee, K. Burch, J. Han, Ying Ran
- PhysicsPhysical Review Letters
- 17 September 2015
Application of the proposal to the recently discovered TaAs family of Weyl semimetals leads to an order-of-magnitude estimate of the photoinduced Hall conductivity which is within the experimentally accessible range.
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