337 citations · 1.5k across the 24 of their papers we have counts for
24 papers
Stripe charge order driven manipulation of Majorana bound states in 2M-WS2 topological superconductor
Xuemin Fan, Xiaoqi Sun, Penghao Zhu +8
Majorana bound states (MBSs) are building blocks for topological quantum computing. They can be generated via the combination of electronic topology and superconductivity. To achie…
Observation of the massive Lee-Fukuyama phason in a charge density wave insulator
Soyeun Kim, Yinchuan Lv, Xiao-Qi Sun +10
The lowest-lying fundamental excitation of an incommensurate charge density wave (CDW) material is widely believed to be a massless phason -- a collective modulation of the phase o…
Higher rank chirality and non-Hermitian skin effect in a topolectrical circuit
Penghao Zhu, Xiao-Qi Sun, Taylor L. Hughes +1
While chirality imbalances are forbidden in conventional lattice systems, non-Hermiticity can effectively avoid the chiral-doubling theorem to facilitate 1D chiral dynamics. Indeed…
Signatures of Majorana bound states and parity effects in two-dimensional chiral p-wave Josephson junctions
Nick Abboud, Varsha Subramanyan, Xiao-Qi Sun +3
We characterize topological features of Josephson junctions formed by coupled mesoscopic chiral -wave superconducting islands. Through analytic and numerical studies of the low-…
Thermalization of Randomly Coupled SYK Models
Ramanjit Sohal, Laimei Nie, Xiao-Qi Sun +1
We investigate the thermalization of Sachdev-Ye-Kitaev (SYK) models coupled via random interactions following quenches from the perspective of entanglement. Previous studies have s…
Multi-gap topology of the Wilson loop operator in mirror symmetric insulators
Penghao Zhu, Taylor L. Hughes, Xiao-Qi Sun
We study the multi-gap topology of the periodic spectra of Wilson loop operators (WLOs) in mirror symmetric insulators. We develop two topological invariants each associated with a…
Large extrinsic phonon thermal Hall effect from resonant scattering
Xiao-Qi Sun, Jing-Yuan Chen, Steven A. Kivelson
Recent experimental observations of unexpectedly large thermal Hall conductivities, , in insulating materials, including the parent compounds of the high temperature supercond…
Topological gauge theory for mixed Dirac stationary states in all dimensions
Ze-Min Huang, Xiao-Qi Sun, Sebastian Diehl
We derive the universal real time topological gauge field action for mixed quantum states of weakly correlated fermions in all dimensions, and demonstrate its independence o…
Torsion, energy magnetization and thermal Hall effect
Ze-Min Huang, Bo Han, Xiao-Qi Sun
We study the effective action of hydrostatic response to torsion in the absence of spin connections in gapped -dimensional topological phases. In previous studies…
Geometric Response and Disclination-Induced Skin Effects in Non-Hermitian Systems
Xiao-Qi Sun, Penghao Zhu, Taylor L. Hughes
We study the geometric response of three-dimensional non-Hermitian crystalline systems with nontrivial point-gap topology. For systems with fourfold rotation symmetry, we show that…
Quantum entanglement and modulation enhancement of free-electron-bound-electron interaction
Zhexin Zhao, Xiao-Qi Sun, Shanhui Fan
The modulation and engineering of the free-electron wave function bring new ingredients to the electron-matter interaction. We study the dynamics of a free-electron passing by a tw…
Topological Classification of Non-Hermitian Hamiltonians
Charles C. Wojcik, Xiao-Qi Sun, Tomáš Bzdušek +1
We revisit the problem of classifying topological band structures in non-Hermitian systems. Recently, a solution has been proposed, which is based on redefining the notion of energ…
-Symmetric Topological Edge-Gain Effect
Alex Y. Song, Xiao-Qi Sun, Avik Dutt +6
We demonstrate a non-Hermitian topological effect that is characterized by having complex eigenvalues only in the edge states of a topological material, despite the fact that the m…
Enhanced thermal Hall effect in nearly ferroelectric insulators
Jing-Yuan Chen, Steven A. Kivelson, Xiao-Qi Sun
In the context of recent experimental observations of an unexpectedly large thermal Hall conductivity, , in insulating (LCO) and (STO),…
Alice string in Non-Hermitian Systems
Xiao-Qi Sun, Charles C. Wojcik, Shanhui Fan +1
Alice string is a topological defect with a very peculiar feature. When a defect with a monopole charge encircles an Alice string, the monopole charge changes sign. In this work, w…
Three-dimensional Chiral Lattice Fermion in Floquet Systems
Xiao-Qi Sun, Meng Xiao, Tomáš Bzdušek +2
We show that the Nielsen-Ninomiya no-go theorem still holds on Floquet lattice: there is an equal number of right-handed and left-handed Weyl points in 3D Floquet lattice. However,…
Phases of a phenomenological model of twisted bilayer graphene
John F. Dodaro, Steven A. Kivelson, Yoni Schattner +2
We propose a lattice scale two-band generalized Hubbard model as a caricature of the electronic structure of twisted bilayer graphene. Various possible broken symmetry phases can a…
Conversion rules for Weyl points and nodal lines in topological media
Xiao-Qi Sun, Shou-Cheng Zhang, Tomáš Bzdušek
According to a widely-held paradigm, a pair of Weyl points with opposite chirality mutually annihilate when brought together. In contrast, we show that such a process is strictly f…
Constructing three-dimensional photonic topological insulator using two-dimensional ring resonator lattice with a synthetic frequency dimension
Qian Lin, Xiao-Qi Sun, Meng Xiao +2
In the development of topological photonics, achieving three dimensional topological insulators is of significant interest since it enables the exploration of new topological physi…
Topological Quantum Computation Based on Chiral Majorana Fermions
Biao Lian, Xiao-Qi Sun, Abolhassan Vaezi +2
Chiral Majorana fermion is a massless self-conjugate fermion which can arise as the edge state of certain two-dimensonal topological matters. It has been theoretically predicted an…
Quantum phase transition of chiral Majorana fermion in the presence of disorder
Biao Lian, Jing Wang, Xiao-Qi Sun +2
We study the quantum phase transitions of a disordered two-dimensional quantum anomalous Hall insulator with -wave superconducting proximity, which are governed by the percolati…
Double helix nodal line superconductor
Xiao-Qi Sun, Biao Lian, Shou-Cheng Zhang
Time-reversal invariant superconductors in three dimensions may contain nodal lines in the Brillouin zone, which behave exactly as Wilson loops of 3d momentum-space Chern-Simons th…
Helical Spin Order from Topological Dirac and Weyl Semimetals
Xiao-Qi Sun, Shou-Cheng Zhang, Zhong Wang
We study dynamical mass generation and the resultant helical spin orders in topological Dirac and Weyl semimetals, including the edge states of quantum spin Hall insulators, the su…
Superfluidity of Bosons in Kagome Lattices with Frustration
Yi-Zhuang You, Zhu Chen, Xiao-Qi Sun +1
In this letter we consider spinless bosons in a Kagome lattice with nearest-neighbor hopping and on-site interaction, and the sign of hopping is inverted by insetting a π flux in e…