University of Minnesota
School of Physics & Astronomy

Condensed Matter Seminar

Wednesday, October 31st 2018
1:25 pm:
Speaker: Adam Wei Tsen, University of Waterloo, Institute for Quantum Computing
Subject:  New Phase Transitions in Atomically Thin Quantum Materials

We have recently demonstrated an experimental platform to isolate 2D quantum materials that are unstable in the ambient environment. I will discuss our studies of the Weyl semimetal candidate, 1T’-MoTe2, and layered magnetic insulator, CrI3, in the atomically thin limit, made possible using this technique. In MoTe2, lowering dimensionality suppresses the inversion symmetric monoclinic phase, driving the Weyl ground state up to and beyond room temperature. The different electronic structure of thin samples is studied by magnetotransport measurements at low temperature. In CrI3, we observe a very large negative magnetoresistance effect that is quantitatively comparable to colossal magnetoresistance in the manganites. I will explain the origin of this effect and discuss some new opportunities for other 2D magnets.

Faculty Host: Ke Wang

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