Towards an ohmic contact to the Type-II Dirac Semimetal Platinum Ditelluride (PtTe2) and its magnetic alloys for Electronic Transport Measurements at Low Temperatures
ORAL
Abstract
PtTe2 is a van der Waals material that hosts type-II Dirac fermions, exotic particles that have no counterpart in free space. When alloyed with Cr, PtTe2 leads to the family of materials Cr_xPt_(1-x)Te_2. These Cr alloys are ferromagnetic at high temperatures (220 K for x=0.45) and retain the air stability and some of the topological properties of their parent crystal, PtTe2 [1]. Here, we look at different alternatives to contact a single layer of these materials with the aim of performing electronic transport measurements at low temperatures. We start our investigation with PtTe2, that is known to act like a semiconductor when stripped down to a single layer using mechanical exfoliation. We show preliminary sample fabrication results that make use of polycarbonate stamps to contact PtTe2 thin crystals with graphene. This sample fabrication method aims at tuning the Fermi level of the graphene electrodes to achieve an ohmic, barrier-free contact to PtTe2.
*Funding for this project was provided by the Cal State Long Beach and Ohio State University Partnership for Education and Research in Hard and Soft Materials, a National Science Foundation PREM, under Grant No. 2122199, and the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DESC0018154.
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Publication: [1] Warren, A. M. Ochs, A. J. Williams, Y. Zhang, Simo Kraguljac, Z. Deng, C. E. Moore, Wolfgang Windl, Chun Ning Lau, and J. E. Goldberger, CrxPt1–xTe2 (X ≤ 0.45): A Family of Air-Stable and Exfoliatable van Der Waals Ferromagnets, ACS Nano 16, 3852 (2022).
Presenters
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Movindu K Dissanayake Mudiyanselage
- California State University, Long Beach