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MoTe2: An uncompensated semimetal with extremely large magnetoresistance

Thirupathaiah, S and Jha, Rajveer and Pal, Banabir and Matias, JS and Das, P Kumar and Sivakumar, PK and Vobornik, I and Plumb, NC and Shi, M and Ribeiro, RA and Sarma, DD (2017) MoTe2: An uncompensated semimetal with extremely large magnetoresistance. In: Physical Review B, 95 (24). ISSN 2469-9950

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Official URL: https://doi.org/10.1103/PhysRevB.95.241105


Transition-metal dichalcogenides (WTe2 and MoTe2) have recently drawn much attention, because of the nonsaturating extremely large magnetoresistance (XMR) observed in these compounds in addition to the predictions of likely type-II Weyl semimetals. Contrary to the topological insulators or Dirac semimetals where XMR is linearly dependent on the field, in WTe2 and MoTe2 the XMR is nonlinearly dependent on the field, suggesting an entirely different mechanism. Electron-hole compensation has been proposed as a mechanism of this nonsaturating XMR in WTe2, while it is yet to be clear in the case of MoTe2 which has an identical crystal structure of WTe2 at low temperatures. In this Rapid Communication, we report low-energy electronic structure and Fermi surface topology of MoTe2 using angle-resolved photoemission spectrometry (ARPES) technique and first-principles calculations, and compare them with that of WTe2 to understand the mechanism of XMR. Our measurements demonstrate that MoTe2 is an uncompensated semimetal, contrary to WTe2 in which compensated electron-hole pockets have been identified, ruling out the applicability of charge compensation theory for the nonsaturating XMR in MoTe2. In this context, we also discuss the applicability of other existing conjectures on the XMR of these compounds.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright of this article belongs to the author.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 02 Jun 2022 06:44
Last Modified: 02 Jun 2022 06:44
URI: https://eprints.iisc.ac.in/id/eprint/73072

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