Publications (20)
Dissipative transverse-field Ising model: steady-state correlations and spin squeezing
Tony E. Lee, Ching-Kit Chan
We study the transverse-field Ising model with infinite-range coupling and spontaneous emission on every site. We find that there is spin squeezing in steady state due to the prese…
Type-II Weyl cone transitions in driven semimetals
Ching-Kit Chan, Yun-Tak Oh, Jung Hoon Han +1
Periodically driven systems provide tunable platforms to realize interesting Floquet topological phases and phase transitions. In electronic systems with Weyl dispersions, the band…
Direct optical detection of Weyl fermion chirality in a topological semimetal
Qiong Ma, Su-Yang Xu, Ching-Kit Chan +10
A Weyl semimetal (WSM) is a novel topological phase of matter, in which Weyl fermions (WFs) arise as pseudo-magnetic monopoles in its momentum space. The chirality of the WFs, give…
Dissipative phase transitions: Independent versus collective decay and spin squeezing
Tony E. Lee, Ching-Kit Chan, Susanne F. Yelin
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 d…
Precision of electromagnetic control of a quantum system
Ching-Kit Chan, L. J. Sham
Coherent control of a spin is limited by both the decoherence due to coupling with the environment and noise coming from the quantized control. The quantum noise study of this syst…
Magnetism and orbital-ordering in an interacting three band model: a dynamical mean field study
Ching-Kit Chan, Philipp Werner, Andrew J. Millis
Single-site dynamical mean field theory is used to determine the magnetic and orbital-ordering phase diagram for a model of electrons moving on a lattice with three orbital states…
Adiabatic Green's function technique and the transient behavior in time-dependent fermion-boson coupled models
Yun-Tak Oh, Yoichi Higashi, Ching-Kit Chan +1
The Lang-Firsov Hamiltonian, a well-known solvable model of interacting fermion-boson system with sideband features in the fermion spectral weight, is generalized to have the time-…
Robust Distant Entanglement Generation Using Coherent Multiphoton Scattering
Ching-Kit Chan, L. J. Sham
We describe a protocol to entangle two qubits at a distance by using resonance fluorescence. The scheme makes use of the postselection of large and distinguishable fluorescence sig…
Anisotropic Fermi liquid theory of the ultra cold fermionic polar molecules: Landau parameters and collective modes
Ching-Kit Chan, Congjun Wu, Wei-cheng Lee +1
We study the Fermi liquid properties of the cold atomic dipolar Fermi gases with the explicit dipolar anisotropy using perturbative approaches. Due to the explicit dipolar anisotro…
Selective scattering between Floquet-Bloch and Volkov states in a topological insulator
Fahad Mahmood, Ching-Kit Chan, Zhanybek Alpichshev +4
The coherent optical manipulation of solids is emerging as a promising way to engineer novel quantum states of matter. The strong time periodic potential of intense laser light can…
Photocurrents in Weyl semimetals
Ching-Kit Chan, Netanel H. Lindner, Gil Refael +1
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 s…
Fermi liquid behavior and spin-charge separation in underdoped cuprates
Ching-Kit Chan, Tai-Kai Ng
The Gaussian fluctuations in slave-boson mean-field theory of model is analyzed in this paper in the low-doping regime where the superconducting to normal (pseudo-gap phase)…
Limit cycle phase in driven-dissipative spin systems
Ching-Kit Chan, Tony E. Lee, Sarang Gopalakrishnan
We explore the phase diagram of interacting spin- systems in the presence of anisotropic interactions, spontaneous decay and driving. We find a rich phase diagram featuring a…
Quantum correlation of an optically controlled quantum system
Ching-Kit Chan, L. J. Sham
A precise time-dependent control of a quantum system relies on an accurate account of the quantum interference among the system, the control and the environment. A diagrammatic tec…
Quantum interference between independent reservoirs in open quantum systems
Ching-Kit Chan, Guin-Dar Lin, Susanne F. Yelin +1
When a quantum system interacts with multiple reservoirs, the environmental effects are usually treated in an additive manner. We show that this assumption breaks down for non-Mark…
Entanglement tongue and quantum synchronization of disordered oscillators
Tony E. Lee, Ching-Kit Chan, Shenshen Wang
We study the synchronization of dissipatively-coupled van der Pol oscillators in the quantum limit, when each oscillator is near its quantum ground state. Two quantum oscillators w…
When chiral photons meet chiral fermions - Photoinduced anomalous Hall effects in Weyl semimetals
Ching-Kit Chan, Patrick A. Lee, Kenneth S. Burch +2
The Weyl semimetal is characterized by three-dimensional linear band touching points called Weyl nodes. These nodes come in pairs with opposite chiralities. We show that the coupli…
Electrically switchable Berry curvature dipole in the monolayer topological insulator WTe2
Su-Yang Xu, Qiong Ma, Huitao Shen +16
Recent experimental evidence for the quantum spin Hall (QSH) state in monolayer WTe has bridged two of the most active fields of condensed matter physics, 2D materials and topo…
Emergence of Gapped Bulk and Metallic Side Walls in the Zeroth Landau level in Dirac and Weyl semimetals
Ching-Kit Chan, Patrick A. Lee
Recent transport experiments have revealed the activation of longitudinal magnetoresistance of Weyl semimetals in the quantum limit, suggesting the breakdown of chiral anomaly in a…
Heralded magnetism in non-Hermitian atomic systems
Tony E. Lee, Ching-Kit Chan
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…