Title: Quantum phenomena in the Landau levels of atomically-thin transition metal dicalcogenides

Speaker: Prof. Qianhui Shi, University of California, Los Angeles

Host: Prof. Yangmu Li, Institute of Physics, CAS

Time: 10:00 am, April 21st, 2023

Tencent Meeting ID : 618-123-792

Password: 0421

Abstract: 

Landau levels offer a neat model system to study emergent quantum phases, owing to the dominating Coulomb interactions and tunable orbital wavefunctions. In atomically-thin transition metal dicalcogenide, the well-resolved and -controlled spin, valley and layer degree of freedom further enriches the physics that can be explored. In this talk, I’ll discuss a few examples in WSe2: first, a bilayer WSe2 allows selective carrier population of the individual layers; when the filling factor of the two layers is an integer number, it manifests as a natural platform for interlayer exciton condensate. Second, a large imbalance in the population of two (pseudo)spins gives rise to spin-dependent transport in partially filled Landau levels - the spin-minority carriers are much less mobile than the spin-majority carriers. I’ll discuss how such spin-dependent transport behavior is consistent with a polaron picture.

Reference:

[1] Nat. Nanotechnol. 17, 577 (2022).

[2] Phys. Rev. Lett. 126, 106804 (2021).

[3] Nat. Nanotechnol. 15, 569 (2020).

Brief CV of Prof. Qianhui Shi:

Qianhui Shi got her PhD in physics from University of Minnesota in 2017, did postdoctoral research at University of Columbia, and joined the physics department of UCLA as an assistant professor in Nov 2021. Her research efforts have focused on electronic properties in two dimension systems.

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