2.4k citations · 6.4k across the 28 of their papers we have counts for
28 papers
Design monolayer iodinenes based on halogen bond and tiling theory
Kejun Yu, Botao Fu, Runwu Zhang +5
Xenes, two-dimensional (2D) monolayers composed of a single element, with graphene as a typical representative, have attracted widespread attention. Most of the previous Xenes, X f…
Optical bulk-boundary dichotomy in a quantum spin Hall insulator
Junfeng Han, Pengcheng Mao, Hailong Chen +17
The bulk-boundary correspondence is a key concept in topological quantum materials. For instance, a quantum spin Hall insulator features a bulk insulating gap with gapless helical…
2D Ladder polyborane: an ideal Dirac semimetal with a multi-feld-tunable band gap
Botao Fu, Run-Wu Zhang, Xiaotong Fan +3
Hydrogen, a simple and magic element, has attracted increasing attention for its effective incorporation within solids and powerful manipulation of electronic states. Here, we show…
From Atomic Semimetal to Topological Nontrivial Insulator
Xiao-Ping Li, Da-Shuai Ma, Cheng-Cheng Liu +2
Topological band insulators and (semi-) metals can arise out of atomic insulators when the hopping strength between electrons increases. Such topological phases are separated from…
-symmetric higher-order topological crystalline insulators in atomically thin transition-metal dichalcogenides
Shifeng Qian, Gui-bin Liu, Cheng-Cheng Liu +1
Based on first-principles calculations and symmetry analysis, we predict atomically thin ( layers) 2H group-VIB TMDs ( = Mo, W; = S, Se, Te) are large-gap higher…
Second Order Topological Insulator State in Hexagonal Lattices and its Abundant Material Candidates
Shifeng Qian, Cheng-Cheng Liu, Yugui Yao
We propose two mechanisms to realize the second order topological insulator (SOTI) state in spinless hexagonal lattices, viz., chemical modification and anti-Kekulé/Kekulé distorti…
Chiral SO(4) spin-valley density wave and degenerate topological superconductivity in magic-angle-twisted bilayer-graphene
Chen Lu, Yongyou Zhang, Yu Zhang +6
Starting from a realistic extended Hubbard model for a -orbital tight-binding model on the Honeycomb lattice, we perform a thorough investigation on the possible electron…
From Node-Line Semimetals to Large Gap QSH States in New Family of Pentagonal Group-IVA Chalcogenide
Run-Wu Zhang, Cheng-Cheng Liu, Da-Shuai Ma +1
Two-dimensional (2D) topological insulators (TIs) have attracted tremendous research interest from both theoretical and experimental fields in recent years. However, it is much les…
Odd-integer quantum Hall states and giant spin susceptibility in p-type few-layer WSe2
Shuigang Xu, Junying Shen, Gen Long +17
We fabricate high-mobility p-type few-layer WSe2 field-effect transistors and surprisingly observe a series of quantum Hall (QH) states following an unconventional sequence predomi…
Discovery of two-dimensional Dirac nodal line fermions in monolayer Cu2Si
Baojie Feng, Botao Fu, Shusuke Kasamatsu +18
Topological nodal line semimetals, a novel quantum state of materials, possess topologically nontrivial valence and conduction bands that touch at a line near the Fermi level. The…
Floquet High Chern Insulators in Periodically Driven Chirally Stacked Multilayer Graphene
Si Li, Cheng-Cheng Liu, Yugui Yao
Chirally stacked -layer graphene is a semimetal with band-touching at two nonequivalent corners in its Brillioun zone. We predict that an off-resonant circularly polar…
Topological, Valleytronic, and Optical Properties of Monolayer PbS
Wenhui Wan, Yugui Yao, Liangfeng Sun +2
We systematically examine the topological, valleytronic, and optical properties of experimentally accessible PbS (001) few-layers, with a focus on the monolayer. With even-odd laye…
A new kind of 2D topological insulators BiCN with a giant gap and its substrate effects
Botao Fu, Yanfeng Ge, Wenyong Su +2
Based on DFT calculation, we predict that BiCN, i.e., bilayer Bi films passivated with -CN group, is a novel 2D Bi-based material with highly thermodynamic stability, and demonstra…
van der Waals Heterostructures of Germanene, Stanene and Silicene with Hexagonal Boron Nitride and Their Topological Domain Walls
Maoyuan Wang, Liping Liu, Cheng-Cheng Liu +1
We investigate van der Waals (vdW) heterostructures made of germanene, stanene or silicene with hexagonal Boron Nitride (h-BN). The intriguing topological properties of these buckl…
Weak Topological Insulators and Composite Weyl Semimetals: -BiX (X=Br, I)
Cheng-Cheng Liu, Jin-Jian Zhou, Yugui Yao +1
While strong topological insulators (STI) have been experimentally realized soon after their theoretical predictions, a weak topological insulator (WTI) has yet to be unambiguously…
Valley-polarized quantum anomalous Hall phases and tunable topological phase transitions in half-hydrogenated Bi honeycomb monolayers
Cheng-Cheng Liu, Jin-Jian Zhou, Yugui Yao
Based on first-principles calculations, we find novel valley-polarized quantum anomalous Hall (VP-QAH) phases with a large gap-0.19 eV at an appropriate buckled angle and tunable t…
Time-reversal-invariant topological superconductivity in n-doped BiH
Fan Yang, Cheng-Cheng Liu, Yu-Zhong Zhang +2
Intrinsic and symmetry protected topological states have attracted lots of interest in condensed matter physics recently. In particular, time reversal symmetry protected fermion to…
Large-Gap Quantum Spin Hall Insulator in single layer bismuth monobromide BiBr
Jin-Jian Zhou, Wanxiang Feng, Cheng-Cheng Liu +2
Quantum spin Hall (QSH) insulators have gapless topological edge states inside the bulk band gap, which can serve as dissipationless spin current channels protected by the time-rev…
Topological metallic states in spin-orbit coupled bilayer systems
Hui Pan, Xin Li, Zhenhua Qiao +3
We investigate the influence of different spin-orbit couplings on topological phase transitions in the bilayer Kane-Mele model. We find that the competition between intrinsic spin-…
Low-Energy Effective Hamiltonian for Giant-Gap Quantum Spin Hall Insulators in Honeycomb X-Hydride/Halide (X=N-Bi) Monolayers
Cheng-Cheng Liu, Shan Guan, Zhigang Song +3
Using the tight-binding method in combination with first-principles calculations, we systematically derive a low-energy effective Hilbert subspace and Hamiltonian with spin-orbit c…
Quantum spin Hall insulators and quantum valley Hall insulators of BiX/SbX (X = H, F, Cl, and Br) monolayers with a record bulk band gap
Zhigang Song, Cheng-Cheng Liu, Jinbo Yang +7
Large bulk band gap is critical for application of the quantum spin Hall (QSH) insulator or two dimensional (2D) topological insulator (TI) in spintronic device operating at room t…
Valley-Polarized Quantum Anomalous-Hall Effects in Silicene
Hui Pan, Zhenshan Li, Cheng-Cheng Liu +3
We demonstrate a new quantum state of matter---valley-polarized quantum anomalous Hall effect in monolayer silicene. In the presence of extrinsic Rashba spin-orbit coupling and exc…
Observation of Dirac cone warping and chirality effects in silicene
Baojie Feng, Hui Li, Cheng-Cheng Liu +6
We performed low temperature scanning tunneling microscopy (STM) and spectroscopy (STS) studies on the electronic properties of (R3xR3)R30° phase of silicene on Ag(111) surface. We…
Electronic Structures of Graphene Layers on Metal Foil: Effect of Point Defects
Hui Yan, Cheng-Cheng Liu, Ke-Ke Bai +9
Here we report a facile method to generate a high density of point defects in graphene on metal foil and show how the point defects affect the electronic structures of graphene lay…