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arXiv · 1804.10104

Large effective mass and interaction-enhanced Zeeman splitting of $K$-valley electrons in MoSe$_2$

Stefano Larentis·Hema C. P. Movva·Babak Fallahazad·Kyoughwan Kim·Armad Behroozi·Takashi Taniguchi·Kenji Watanabe·Sanjay K. Banerjee·Emanuel Tutuc
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Abstract

We study the magnetotransport of high-mobility electrons in monolayer and bilayer MoSe$_2$, which show Shubnikov-de Haas (SdH) oscillations and quantum Hall states in high magnetic fields. An electron effective mass of 0.8$m_e$ is extracted from the SdH oscillations' temperature dependence; $m_e$ is the bare electron mass. At a fixed electron density the longitudinal resistance shows minima at filling factors (FFs) that are either predominantly odd, or predominantly even, with a parity that changes as the density is tuned. The SdH oscillations are insensitive to an in-plane magnetic field, consistent with an out-of-plane spin orientation of electrons at the $K$-point. We attribute the FFs parity transitions to an interaction enhancement of the Zeeman energy as the density is reduced, resulting in an increased Zeeman-to-cyclotron energy ratio.

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Stefano Larentis, Hema C. P. Movva, Babak Fallahazad, Kyoughwan Kim, Armad Behroozi, Takashi Taniguchi, Kenji Watanabe, Sanjay K. Banerjee, Emanuel Tutuc. 2018-05-16. Large effective mass and interaction-enhanced Zeeman splitting of $K$-valley electrons in MoSe$_2$. https://doi.org/10.1103/physrevb.97.201407

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