Topological Dirac semimetal BaAuSb

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Topological Dirac semimetal BaAuSb

Zhixiang Hu (胡之翔), Jahyun Koo, Yong Hu (胡勇), Qi Wang (王琦), Milinda Abeykoon, D. Graf, Yu Liu (刘育), Hechang Lei (雷和畅), Junzhang Ma (馬均章), Ming Shi (史明), Binghai Yan (颜丙海), and C. Petrovic

Phys. Rev. Research 5, 013079 – Published 3 February 2023

Abstract

Dirac semimetals feature Dirac cones with topologically nontrivial states in the bulk that are protected by crystalline symmetries. They attract considerable attention due to rich quantum states and properties of interest, such as high Fermi velocities, mobility, and small effective masses. Here, we show that a ternary intermetallic BaAuSb crystal hosts both trivial and nontrivial topological Dirac states in the bulk. The nontrivial Fermi-surface pocket at the Brillouin zone center is characterized with only a few hundredths of a bare electron mass and with very high mobility. All parts of the Fermi surface detected by quantum oscillations, topologically trivial or nontrivial, have carriers with unusually high Fermi velocities and small masses. These conducting states may be coupled with magnetic moments in materials where Ba is replaced by magnetic rare-earth atoms.

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Received 5 September 2022
Revised 9 January 2023
Accepted 11 January 2023

DOI:https://doi.org/10.1103/PhysRevResearch.5.013079

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Electrical properties Electronic structure Fermi surface First-principles calculations Topological materials Transport phenomena

Dirac semimetal

Angle-resolved photoemission spectroscopy Band structure methods Density functional theory Quantum oscillation techniques Resistivity measurements Specific heat measurements de Haas-van Alphen effect

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Zhixiang Hu (胡之翔)^1,2, Jahyun Koo³, Yong Hu (胡勇)⁴, Qi Wang (王琦)^1,5,*, Milinda Abeykoon⁶, D. Graf⁷, Yu Liu (刘育)^1,†, Hechang Lei (雷和畅)⁵, Junzhang Ma (馬均章)⁸, Ming Shi (史明)⁴, Binghai Yan (颜丙海)^3,‡, and C. Petrovic ^1,2,§

¹Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
²Department of Material Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11790, USA
³Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
⁴Photon Science Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
⁵Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
⁶Photon Science Division, National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
⁷National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA
⁸Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, China

^*Present address: School of Physical Science and Technology, Shanghai Tech University, Shanghai 201210, China.
^†Present address: Los Alamos National Laboratory, MS K764, Los Alamos, New Mexico 87545, USA.
^‡binghai.yan@weizmann.ac.il
^§petrovic@bnl.gov

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Vol. 5, Iss. 1 — February - April 2023

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