3 years ago

Tunable $\Gamma - K$ Valley Populations in Hole-Doped Trilayer WSe$_2$.

Hema C. P. Movva, Allan H. MacDonald, Babak Fallahazad, Emanuel Tutuc, Takashi Taniguchi, Kenji Watanabe, Timothy Lovorn, Sanjay K. Banerjee, Kyounghwan Kim, Stefano Larentis

We present a combined experimental and theoretical study of valley populations in the valence bands of trilayer WSe$_2$. Shubnikov$-$de Haas oscillations show that trilayer holes populate two distinct subbands associated with the $K$ and $\Gamma$ valleys, with effective masses 0.5$m_e$ and $1.2m_e$, respectively; $m_e$ is the bare electron mass. At a fixed total hole density, an applied transverse electric field transfers holes from $\Gamma$ orbitals to $K$ orbitals. We are able to explain this behavior in terms of the larger layer polarizability of the $K$ orbital subband.

Publisher URL: http://arxiv.org/abs/1801.03474

DOI: arXiv:1801.03474v1

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