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Ideal Weak Topological Insulator and Protected Helical Saddle Points
Ji Seop Oh, Tianyi Xu, Nikhil Dhale +16
The paradigm of classifying three-dimensional (3D) topological insulators into strong and weak ones (STI and WTI) opens the door for the discovery of various topological phases of…
Strong Dzyaloshinskii-Moriya Interaction in Monolayer CrI on Metal Substrates
Fan Zhang, Xueao Li, Yabei Wu +3
Dzyaloshinskii-Moriya interaction (DMI) is the primary mechanism for realizing real-space chiral spin textures, which are regarded as key components for the next-generation spintro…
Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material BiI
Jianwei Huang, Sheng Li, Chiho Yoon +16
Quasi-one-dimensional (1D) materials provide a superior platform for characterizing and tuning topological phases for two reasons: i) existence for multiple cleavable surfaces that…
Inelastic electron tunneling in 2H-TaNbSe evidenced by scanning tunneling spectroscopy
Xing-Yuan Hou, Fan Zhang, Xin-Hai Tu +12
We report a detailed study of tunneling spectra measured on 2H-TaNbSe () single crystals using a low-temperature scanning tunneling microscope. The pro…
Topological negative refraction of surface acoustic waves in a Weyl phononic crystal
Hailong He, Chunyin Qiu, Liping Ye +5
Reflection and refraction occur at interface between two different media. These two fundamental phenomena form the basis of fabricating various wave components. Specifically, refra…
Circular Dichroism and Radial Hall Effects in Topological Materials
Ying Liu, Shengyuan A. Yang, Fan Zhang
Under symmetry breaking, a three-dimensional nodal-line semimetal can turn into a topological insulator or Weyl semimetal, accompanied by the generation of momentum-space Berry cur…
Spin-orbit-free Weyl-loop and Weyl-point semimetals in a stable three-dimensional carbon allotrope
Yuanping Chen, Yuee Xie, Shengyuan A. Yang +4
Topological band theory has revolutionized our understanding of electronic structure of materials, in particular, a novel state - Weyl semimetal - has been predicted for systems wi…
Universal low-temperature Ohmic contacts for quantum transport in transition metal dichalcogenides
Shuigang Xu, Zefei Wu, Huanhuan Lu +14
Low carrier mobility and high electrical contact resistance are two major obstacles prohibiting explorations of quantum transport in TMDCs. Here, we demonstrate an effective method…
surface states of SnTe
Yin Shi, Meng Wu, Fan Zhang +1
The characterization and applications of topological insulators depend critically on their protected surface states, which, however, can be obscured by the presence of trivial dang…
Buckled honeycomb lattice and unconventional magnetic response
Shengyuan A. Yang, Hui Pan, Fan Zhang
We study the magnetic response of buckled honeycomb-lattice materials. The buckling breaks the sublattice symmetry, enhances the spin-orbit coupling, and allows the tuning of a top…
Designer Topological Insulators in Superlattices
Xiao Li, Fan Zhang, Qian Niu +1
Gapless Dirac surface states are protected at the interface of topological and normal band insulators. In a binary superlattice bearing such interfaces, we establish that valley-de…
Band Structure of ABC-Stacked Graphene Trilayers
Fan Zhang, Bhagawan Sahu, Hongki Min +1
The ABC-stacked N-layer-graphene family of two-dimensional electron systems is described at low energies by two remarkably flat bands with Bloch states that have strongly momentum-…