scholarly journals Three-dimensional topological semimetal phase in layered TaNiTe5 probed by quantum oscillations

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
Zheng Chen ◽  
Min Wu ◽  
Yong Zhang ◽  
Jinglei Zhang ◽  
Yong Nie ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Quantum Oscillations ◽  
Topological Semimetal

scholarly journals Quantum oscillations in a lead chalcogenide three-dimensional Dirac system

2017 ◽  
Vol 95 (3) ◽  
Author(s):  
Filip Orbanić ◽  
Mario Novak ◽  
Mirko Baćani ◽  
Ivan Kokanović
Keyword(s):  
Three Dimensional ◽  
Dirac System ◽  
Lead Chalcogenide ◽  
Quantum Oscillations

Quantum oscillations and quasilinear magnetoresistance in the topological semimetal candidate ScSn2

2021 ◽  
Vol 104 (16) ◽  
Author(s):  
Y. Chen ◽  
F. Tang ◽  
W. Z. Meng ◽  
X. Shen ◽  
W. Zhao ◽  
...  
Keyword(s):  
Quantum Oscillations ◽  
Topological Semimetal

scholarly journals Magnetic field induced strong valley polarization in the three-dimensional topological semimetal LaBi

2017 ◽  
Vol 96 (16) ◽  
Author(s):  
Nitesh Kumar ◽  
Chandra Shekhar ◽  
J. Klotz ◽  
J. Wosnitza ◽  
Claudia Felser
Keyword(s):  
Magnetic Field ◽  
Three Dimensional ◽  
Topological Semimetal ◽  
Valley Polarization

scholarly journals Confinement Effect Driven Quantum Spin Hall Effect in Monolayer AuTe2Cl

SPIN ◽  
2019 ◽  
Vol 09 (04) ◽  
pp. 1940014
Author(s):  
Guyue Zhong ◽  
Q. Xie ◽  
Gang Xu
Keyword(s):  
First Principles ◽  
Three Dimensional ◽  
Bulk Sample ◽  
Quantum Spin ◽  
Confinement Effect ◽  
First Principles Calculations ◽  
Quantum Spin Hall Effect ◽  
Band Inversion ◽  
Topological Semimetal ◽  
Quantum Spin Hall

Based on first-principles calculations, we predict that the monolayer AuTe2Cl is a quantum spin Hall (QSH) insulator with a topological band gap about 10 meV. The three-dimensional (3D) AuTe2Cl is a topological semimetal that can be viewed as the monolayer stacking along [Formula: see text] axis. By studying the energy-level distribution of [Formula: see text] orbitals of Te atoms for the bulk and the monolayer, we find that the confinement effect driven [Formula: see text] band inversion is responsible for the topological nontrivial nature of monolayer. Since 3D bulk AuTe2Cl has already been experimentally synthesized, we expect that monolayer AuTe2Cl can be exfoliated from a bulk sample and the predicted QSH effect can be observed.

scholarly journals Three-dimensional Dirac semimetal and magnetic quantum oscillations in Cd3As2

2017 ◽  
Vol 903 ◽  
pp. 012038 ◽  
Author(s):  
Filip Orbanić ◽  
Mario Novak ◽  
Nikola Biliškov ◽  
Sanda Pleslić ◽  
Ivan Kokanović
Keyword(s):  
Three Dimensional ◽  
Quantum Oscillations ◽  
Dirac Semimetal ◽  
Magnetic Quantum Oscillations

scholarly journals Experimental observation of hydrodynamic-like behavior in 3D topological semimetal ZrTe5

2021 ◽  
Author(s):  
Chang-woo Cho ◽  
Peipei Wang ◽  
Fangdong Tang ◽  
Sungkyun Park ◽  
Mingquan He ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Wide Temperature Range ◽  
Collective Excitation ◽  
Condensed Matter ◽  
Three Dimensional ◽  
Local Maximum ◽  
Mean Free Path ◽  
Ballistic Regime ◽  
Topological Semimetal

Abstract Hydrodynamic fluidity in condensed matter physics has been experimentally demonstrated only in a limited number of compounds because of the stringent conditions that must be satisfied. Herein, we demonstrate the existence of hydrodynamic-like properties driven by the collective excitation of the Dirac fluid in the three-dimensional topological semimetal ZrTe5. By measuring the electrical and thermal properties in a wide temperature range, we find a regime satisfying phononic hydrodynamic-like characteristics with two representative experimental evidences: a faster evolution of the thermal conductivity than in the ballistic regime and the existence of a local maximum of the effective mean free path. In contrast to phononic hydrodynamics, the Wiedemann-Franz law is violated by about a factor of 100. Moreover, phonon-dragged anomalies are observed, which serve as a signature of the Dirac fluidity in this system.

scholarly journals Orbit topology analyzed from π phase shift of magnetic quantum oscillations in three-dimensional Dirac semimetal

2021 ◽  
Vol 118 (29) ◽  
pp. e2023027118
Author(s):  
Sang-Eon Lee ◽  
Myeong-jun Oh ◽  
Sanghyun Ji ◽  
Jinsu Kim ◽  
Jin-Hyeon Jun ◽  
...  
Keyword(s):  
Phase Shift ◽  
Three Dimensional ◽  
Dirac Fermion ◽  
Quantum Oscillations ◽  
Dirac Semimetal ◽  
Single Orbit ◽  
Dirac Materials ◽  
Dirac Semimetals ◽  
Cyclotron Mass ◽  
Magnetic Quantum Oscillations

With the emergence of Dirac fermion physics in the field of condensed matter, magnetic quantum oscillations (MQOs) have been used to discern the topology of orbits in Dirac materials. However, many previous researchers have relied on the single-orbit Lifshitz–Kosevich (LK) formula, which overlooks the significant effect of degenerate orbits on MQOs. Since the single-orbit LK formula is valid for massless Dirac semimetals with small cyclotron masses, it is imperative to generalize the method applicable to a wide range of Dirac semimetals, whether massless or massive. This report demonstrates how spin-degenerate orbits affect the phases in MQOs of three-dimensional massive Dirac semimetal, NbSb2. With varying the direction of the magnetic field, an abrupt π phase shift is observed due to the interference between the spin-degenerate orbits. We investigate the effect of cyclotron mass on the π phase shift and verify its close relation to the phase from the Zeeman coupling. We find that the π phase shift occurs when the cyclotron mass is half of the electron mass, indicating the effective spin gyromagnetic ratio as gs = 2. Our approach is not only useful for analyzing MQOs of massless Dirac semimetals with a small cyclotron mass but also can be used for MQOs in massive Dirac materials with degenerate orbits, especially in topological materials with a sufficiently large cyclotron mass. Furthermore, this method provides a useful way to estimate the precise gs value of the material.

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