journal article·2023-11-01Open access

Tuning the band topology of GdSb by epitaxial strain

Hadass S. Inbar, Dai Q. Ho, Shouvik Chatterjee, Aaron N. Engel, Shoaib Khalid, Connor P. Dempsey, Mihir Pendharkar, Yu Hao Chang, Shinichi Nishihaya, Alexei V. Fedorov, Donghui Lu, Makoto Hashimoto, Dan Read, Anderson Janotti, Christopher J. Palmstrøm

APL Materials· Volume 11· Issue 11

Abstract

Rare-earth monopnictide (RE-V) semimetal crystals subjected to hydrostatic pressure have shown interesting trends in magnetoresistance, magnetic ordering, and superconductivity, with theory predicting pressure-induced band inversion. Yet, thus far, there have been no direct experimental reports of interchanged band order in RE-Vs due to strain. This work studies the evolution of band topology in biaxially strained GdSb(001) epitaxial films using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT). As biaxial strain is tuned from tensile to compressive strain, the gap between the hole and the electron bands dispersed along [001] decreases. The conduction and valence band shifts seen in DFT and ARPES measurements are explained by a tight-binding model that accounts for the orbital symmetry of each band. Finally, we discuss the effect of biaxial strain on carrier compensation and magnetic ordering temperature.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Iron-based superconductors research · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Materials Department, University of California Santa Barbara 1 , Santa Barbara, California 93106, USA

Department of Materials Science and Engineering, University of Delaware 2 , Newark, Delaware 19716, USA

Faculty of Natural Sciences, Quy Nhon University 3 , Quy Nhon 59000, Vietnam

Electrical and Computer Engineering Department, University of California Santa Barbara 4 , Santa Barbara, California 93106, USA

5 Department of Physics, School of Natural Sciences, National University of Science and Technology, Islamabad 44000, Pakistan

Advanced Light Source, Lawrence Berkeley National Laboratory 6 , Berkeley, California 94720, USA

Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory 7 , Menlo Park, California 94025, USA

School of Physics and Astronomy, Cardiff University 8 , Cardiff CF24 3AA, United Kingdom

Funding

U.S. Department of Energy · Office of Naval Research · National Science Foundation

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