Band Structure engineering in epitaxial LuSb thin films via dimensional confinement and bi-axial strain

ORAL

Abstract

Observation of extreme magnetoresistance (XMR) in rare-earth monopnictides has raised strong interest in understanding the role of its electronic structure. Here, the first demonstration of epitaxial synthesis of LuSb thin films on GaSb (001) substrates will be presented. Combining the techniques of molecular-beam epitaxy, low-temperature magnetotransport, angle-resolved photoemission spectroscopy, and hybrid density functional theory, we have unveiled the bandstructure of LuSb, where electron-hole compensation is identified as a mechanism responsible for XMR. However, by fabricating ultra-thin films, it is possible to controllably create an imbalance in the band fillings of electron and hole-like carriers in this otherwise compensated semimetal. Moreover, magnetoresistance behavior can also be tuned by application of bi-axial strain by synthesizing thin films of LuSb on lattice mis-matched substrates. Our work demonstrates the efficacy of epitaxial synthesis of rare-earth monopnictides to control its electronic structure, and thereby its physical properties

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Presenters

  • Shouvik Chatterjee

    Electrical & Computer Engineering, University of California, Santa Barbara, UCSB, Materials Department, University of California, Santa Barbara

Authors

  • Shouvik Chatterjee

    Electrical & Computer Engineering, University of California, Santa Barbara, UCSB, Materials Department, University of California, Santa Barbara

  • Hadass Inbar

    Materials Department, University of California, Santa Barbara

  • Shoaib Khalid

    Department of Physics and Astronomy, University of Delaware, Department of Physics & Astronomy, University of Delaware, University of Delaware

  • Aranya Goswami

    Electrical & Computer Engineering, University of California, Santa Barbara

  • Felipe Crasto de Lima

    Department of Physics & Astronomy, University of Delaware

  • Abhishek Sharan

    Department of Physics & Astronomy, University of Delaware, University of Delaware

  • Fernando Sabino

    Department of Material science and Engineering, University of Delaware, Department of Physics & Astronomy, University of Delaware, Materials Science and Engineering, University of Delaware

  • Tobias L Brown-Heft

    Materials Department, University of California, Santa Barbara

  • Yu-Hao Chang

    Materials Department, University of California, Santa Barbara

  • Alexei V Fedorov

    Lawrence Berkeley Natl Lab, Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory

  • Daniel Read

    School of Physics & Astronomy, University of Cardiff

  • Anderson Janotti

    Department of Material science and Engineering, University of Delaware, Department of Physics & Astronomy, University of Delaware, Materials Science and Engineering, University of Delaware, University of Delaware, Department of Materials Science & Engineering, University of Delaware, Department of Materials Science and Engineering, University of Delaware

  • Chris Palmstrom

    University of California, Santa Barbara, University of California - Santa Barbara, University of California Santa Barbara, Electrical & Computer Engineering, University of California, Santa Barbara, ECE and Materials, University of California, Santa Barbara, Dept. of ECE, University of California Santa Barbara, Materials Department, University of California, Santa Barbara, Materials Engineering, University of California, Santa Barbara, University of California Santa Barbara, Materials Engineering, Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara