921 citations · 3.2k across the 35 of their papers we have counts for
35 papers
Weyl phonons in chiral crystals
Tiantian Zhang, Zhiheng Huang, Zitian Pan +3
Chirality is an indispensable concept that pervades fundamental science and nature, manifesting itself in diverse forms such as chiral quasiparticles and chiral structures. Of part…
Polarization Jumps across Topological Phase Transitions in Two-dimensional Systems
Hiroki Yoshida, Tiantian Zhang, Shuichi Murakami
In topological phase transitions involving a change in topological invariants such as the Chern number and the topological invariant, the gap closes, and the electri…
Polarization jumps by breaking symmetries of two-dimensional Weyl semimetals
Hiroki Yoshida, Tiantian Zhang, Shuichi Murakami
The electric polarization as a bulk quantity is described by the modern theory of polarization in insulating systems and cannot be defined in conducting systems. Upon a gradual cha…
A comprehensive study of complex non-adiabatic exciton dynamics in MoSiN
Mingran Kong, Shuichi Murakami, Tiantian Zhang
Excitons, which are composite boson quasi-particles composed of bound electrons and holes, have many fascinating properties and great potential in practical applications. Though ex…
Parallel and anti-parallel helical surface states for topological semimetals
Tiantian Zhang, Shuichi Murakami
Weyl points, carrying a Z-type monopole charge C, have bulk-surface correspondence (BSC) associated with helical surface states (HSSs). When |C| > 1, multi-HSSs can appear in a par…
Physics of Phonons in Systems with Approximate Screw Symmetry
Hisayoshi Komiyama, Tiantian Zhang, Shuichi Murakami
Properties of systems with exact n-fold screw symmetry (n=2, 3, 4, 6) have been well studied because they can be understood in terms of space groups. On the other hand, existence o…
Chiral phonons entangled with multiple Hall effects and unified convention for pseudoangular momentum in 2D materials
Tiantian Zhang, Shuichi Murakami
Recently, a series of two-dimensional (2D) nonmagnetic layered materials XSi2Y4 (X=transition metals; Y=pnictogens) having similar crystal structures with transition-metal dichalco…
Anomalous Crystal Shapes of Topological Crystalline Insulators
Yutaro Tanaka, Tiantian Zhang, Makio Uwaha +1
Understanding crystal shapes is a fundamental subject in surface science. It is now well studied how chemical bondings determine crystal shapes via dependence of surface energies o…
Endless Dirac nodal lines in kagome-metal Ni3In2S2
Tiantian Zhang, T. Yilmaz, E. Vescovo +6
Topological semimetals are a frontier of quantum materials. In multi-band electronic systems, topological band-crossings can form closed curves, known as nodal lines. In the presen…
Degenerate topological line surface phonons in quasi-1D double helix crystal SnIP
Bo Peng, Shuichi Murakami, Bartomeu Monserrat +1
Degenerate points/lines in the bulk band structures of crystals have become a staple of the growing number of topological materials. The bulk-boundary correspondence provides a rel…
Truly chiral phonons in α-HgS
Kyosuke Ishito, Huiling Mao, Yusuke Kousaka +6
Chirality is a manifestation of the asymmetry inherent in nature. It has been defined as the symmetry breaking of the parity of static objects, and the definition was extended to d…
Unique surface-state connection between Weyl and nodal ring fermions in ferromagnetic material Cs2MoCl6
Tiantian Zhang, Daisuke Hara, Shuichi Murakami
For topological materials with coexistence of Weyl nodes and nodal rings, the surface-state configuration and connection are unique yet have never been studied and discussed before…
Predicting topological materials: symmetry-based indicator theories and beyond
Tiantian Zhang, Shuichi Murakami
Though symmetry-based indicators formulae are powerful in diagnosing topological states with a gapped band structure at/between any high-symmetry points, it fails in diagnosing top…
Chiral phonons and pseudo-angular momentum in non-symmorphic systems
Tiantian Zhang, Shuichi Murakami
Chiral phonons are the ones with nonzero polarization and can be observed only via a selective coupling with valley electrons and circularly polarized photons. In such process, a n…
Kinetic magnetoelectric effect in topological insulators
Ken Osumi, Tiantian Zhang, Shuichi Murakami
The kinetic magnetoelectric effect is an orbital analogue of the Edelstein effect and offers an additional degree of freedom to control magnetisation via the charge current. Here w…
General corner charge formula in two-dimensional C_n-symmetric higher-order topological insulators
Ryo Takahashi, Tiantian Zhang, Shuichi Murakami
In this paper, we derive a general formula for the quantized fractional corner charge in two-dimensional C_n-symmetric higher-order topological insulators. We assume that the elect…
Topological phonons in oxide perovskites controlled by light
Bo Peng, Yuchen Hu, Shuichi Murakami +2
Perovskite oxides exhibit a rich variety of structural phases hosting different physical phenomena that generate multiple technological applications. We find that topological phono…
Observation of a Chiral Wave Function in Twofold Degenerate Quadruple Weyl System BaPtGe
Haoxiang Li, Tiantian Zhang, A. Said +10
Topological states in quantum materials are defined by non-trivial topological invariants, such as the Chern number, which are properties of their bulk wave functions. A remarkable…
Crystal and Electronic Structure of GaTaSe From First-Principle Calculations
Shuai Zhang, Tiantian Zhang, Hongshan Deng +3
GaTaSe belongs to the lacunar spinel family. Its crystal structures is still a puzzle though there have been intensive studies on its novel properties, such as the Mott ins…
Theory of inversion- protected topological chiral hinge states and its applications to layered antiferromagnets
Yutaro Tanaka, Ryo Takahashi, Tiantian Zhang +1
We study positions of chiral hinge states in higher-order topological insulators (HOTIs) with inversion symmetry. First, we exhaust all possible configurations of the hinge states…
Twofold quadruple Weyl nodes in chiral cubic crystals
Tiantian Zhang, Ryo Takahashi, Chen Fang +1
Conventional Weyl nodes are twofold band crossings that carry a unit monopole charge, which can exist in condensed matter systems with the protection of translation symmetry. Uncon…
Quasiparticle Interference Evidence of the Topological Fermi Arc States in Chiral Fermionic Semimetal CoSi
Qian-Qian Yuan, Liqin Zhou, Zhi-Cheng Rao +13
Chiral fermions in solid state feature "Fermi arc" states, connecting the surface projections of the bulk chiral nodes. The surface Fermi arc is a signature of nontrivial bulk topo…
Electron-phonon Coupling and Kohn Anomaly due to the Floating 2D Electronic Bands on the Surface of ZrSiS
Siwei Xue, Tiantian Zhang, Changjiang Yi +7
ZrSiS, an intriguing candidate of topological nodal line semimetals, was discovered to have exotic surface floating two-dimensional (2D) electrons [Phys. Rev. X 7, 041073 (2017)],…
A diagnosis scheme for topological degeneracies at high-symmetry momenta
Tiantian Zhang, Ling Lu, Shuichi Murakami +3
Theories of symmetry-based indicators and topological quantum chemistry, while powerful in diagnosing gapped topological materials, cannot be directly applied to diagnosing band de…