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19 April 2024 |
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Tuning the electronic structure and magnetoresistance in a semi-metallic system by dimensional confinement | | Shouvik Chatterjee
; Shoaib Khalid
; Hadass S. Inbar
; Taozhi Guo
; Yu-Hao Chang
; Elliot Young
; Alexei V. Fedorov
; Dan Read
; Anderson Janotti
; Christopher J. Palmstrøm
; | | Date: |
14 Feb 2020 | | Abstract: | Observation of large, non-saturating magnetoresistance, tunable magnetic
structure and possible realization of topologically non-trivial states make
semi-metallic rare-earth monopnictides an attractive material system for basic
and applied sciences. Here, utilizing a combination of angle-resolved
photoemission spectroscopy, magneto-transport measurements and first-principles
calculations we show that the electronic structure and material properties of
these compounds can be significantly modified in few atomic layer geometries.
Our observation reveals that dimensional confinement in heteroepitaxial LuSb
thin films lifts the carrier compensation and differentially affects the
mobility of the electron and hole-like carriers leading to a strong
modification in the magnetoresistance behavior from its bulk limit, thus
establishing the role of electron-hole compensation in its magnetoresistance
behavior. We unambiguously establish that LuSb remains semi-metallic at least
till the ultra-thin limit of 3 unit cells (1.8 nm). Observed upturn in
resistivity at low temperatures in few atomic layer geometries results from
strong electron-electron interaction effects and should not be construed as
indicative of opening of a bulk band gap. | | Source: | arXiv, 2002.6167 | | Services: | Forum | Review | PDF | Favorites | |
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