147 citations · 642 across the 27 of their papers we have counts for
27 papers
Phase Transitions in Disordered Altermagnetic Josephson Junctions
Chang-An Li
Altermagnetic Josephson junctions (AMJJs) can host unconventional phase and phase despite vanishing net magnetizations. Whether these phases are stable against disorder exi…
Regularized universal topological markers for Dirac systems
Yulin Qin, Chang-An Li, Jian Li
Topological markers provide an efficient and powerful characterization of topological features of many systems, especially when the translation symmetry is broken. Recently, a univ…
Altermagnetism Induced Bogoliubov Fermi Surfaces Form Topological Superconductivity
Bo Fu, Chang-An Li, Björn Trauzettel
We propose a novel type of topological superconductivity based on Bogoliubov Fermi surfaces (BFSs) in an altermagnetic topological insulator proximitized by an s-wave superconducto…
Inner non-Hermitian skin effect on Bethe lattice
Junsong Sun, Chang-An Li, Shiping Feng +1
We investigate the non-Hermitian Su-Schrieffer-Heeger (SSH) model on Bethe lattice, revealing a novel localization phenomenon coined inner non-Hermitian skin effect. This effect is…
Tunable second harmornic in altermagnetic Josephson junctions
Hai-Peng Sun, Song-Bo Zhang, Chang-An Li +1
We study the influence of external electric and Zeeman fields on the Josephson effect in a planar superconductor/altermagnet/superconductor junction. Remarkably, we find that the c…
Klein-bottle quadrupole insulators and Dirac semimetals
Chang-An Li, Junsong Sun, Song-Bo Zhang +2
The Benalcazar-Bernevig-Hughes (BBH) quadrupole insulator model is a cornerstone model for higher-order topological phases. It requires π-flux threading through each plaquette of t…
Nonlinear planar magnetotransport due to tilted Dirac cones in topological materials
Arya Thenapparambil, Graciely Elias dos Santos, Chang-An Li +7
Nonlinear planar magnetotransport is ubiquitous in topological HgTe structures, both in tensile (topological insulator) or compressively strained layers (Weyl semimetal phase). We…
Anomalous Andreev Spectrum and Transport in Non-Hermitian Josephson Junctions
Chang-An Li, Hai-Peng Sun, Björn Trauzettel
We propose a phase-biased non-Hermitian Josephson junction (NHJJ) composed of two superconductors mediated by a short non-Hermitian link. Such a NHJJ is described by an effective n…
Hybrid higher-order skin-topological effect in hyperbolic lattices
Junsong Sun, Chang-An Li, Shiping Feng +1
We investigate the non-Hermitian Haldane model on hyperbolic and lattices, and showcase its intriguing topological properties in the simultaneous presence of…
Enhancement of Second-Order Non-Hermitian Skin Effect by Magnetic Fields
Chang-An Li, Björn Trauzettel, Titus Neupert +1
The non-Hermitian skin effect is a unique phenomenon in which an extensive number of eigenstates are localized at the boundaries of a non-Hermitian system. Recent studies show that…
Helical Topological Superconducting Pairing at Finite Excitation Energies
Masoud Bahari, Song-Bo Zhang, Chang-An Li +4
We propose helical topological superconductivity away from the Fermi surface in three-dimensional time-reversal-symmetric odd-parity multiband superconductors. In these systems, pa…
Topological States in Two-Dimensional Su-Schrieffer-Heeger Models
Chang-An Li
We study the topological properties of the generalized two-dimensional (2D) Su-Schrieffer-Heeger (SSH) models. We show that a pair of Dirac points appear in the Brillouin zone (BZ)…
Magnetic topological transistor exploiting layer-selective transport
Hai-Peng Sun, Chang-An Li, Sang-Jun Choi +3
We propose a magnetic topological transistor based on MnBiTe, in which the "on" state (quantized conductance) and the "off" state (zero conductance) can be easily switc…
Dirac States in an Inclined Two-Dimensional Su-Schrieffer-Heeger Model
Chang-An Li, Sang-Jun Choi, Song-Bo Zhang +1
We propose to realize Dirac states in an inclined two-dimensional Su-Schrieffer-Heeger model on a square lattice. We show that a pair of Dirac points protected by space-time invers…
Transition from metal to higher-order topological insulator driven by random flux
Chang-An Li, Song-Bo Zhang, Jan Carl Budich +1
Random flux is commonly believed to be incapable of driving full metal-insulator transitions in non-interacting systems. Here we show that random flux can after all induce a full m…
Super-resonant transport of topological surface states subjected to in-plane magnetic fields
Song-Bo Zhang, Chang-An Li, Francisco Peña-Benitez +4
Magnetic oscillations of Dirac surface states of topological insulators are expected to be associated with the formation of Landau levels or the Aharonov-Bohm effect. We instead st…
Higher-order Fabry-Pérot Interferometer from Topological Hinge States
Chang-An Li, Song-Bo Zhang, Jian Li +1
We propose an intrinsic 3D Fabry-Pérot type interferometer, coined "higher-order interferometer", that utilizes the chiral hinge states of second-order topological insulators and c…
Chiral Majorana Hinge Modes in Superconducting Dirac Materials
Bo Fu, Zi-Ang Hu, Chang-An Li +2
Chiral Majorana hinge modes are characteristic of a second-order topological superconductor in three dimensions. Here we systematically study pairing symmetry in the point group D_…
Quantum Monte Carlo study of topological phases on a spin analogue of Benalcazar-Bernevig-Hughes model
Jiaojiao Guo, Junsong Sun, Xingchuan Zhu +3
We study the higher-order topological spin phases based on a spin analogue of Benalcazar-Bernevig-Hughes model in two dimensions using large-scale quantum Monte Carlo simulations.…
Topological Phase Transitions in Disordered Electric Quadrupole Insulators
Chang-An Li, Bo Fu, Zi-Ang Hu +2
We investigate disorder-driven topological phase transitions in quantized electric quadrupole insulators. We show that chiral symmetry can protect the quantization of the quadrupol…
Topological States in Generalized Electric Quadrupole Insulators
Chang-An Li, Shu-Shan Wu
The modern theory of electric polarization has recently been extended to higher multipole moments, such as quadrupole and octupole moments. The higher electric multipole insulators…
Pseudo chiral anomaly in zigzag graphene ribbons
Chang-An Li
As the three-dimensional analogs of graphene, Weyl semimetals display signatures of chiral anomaly which arises from charge pumping between the lowest chiral Landau levels of the W…
Majorana-Josephson Interferometer
Chang-An Li, Jian Li, Shun-Qing Shen
We propose an interferometer for chiral Majorana modes where the interference effect is caused and controlled by a Josephson junction of proximity-induced topological superconducto…
Hidden edge Dirac point and robust quantum edge transport in InAs/GaSb quantum wells
Chang-An Li, Song-Bo Zhang, Shun-Qing Shen
The robustness of quantum edge transport in InAs/GaSb quantum wells in the presence of magnetic fields raises an issue on the fate of topological phases of matter under time-revers…