Tunable Γ- K Valley Populations in Hole-Doped Trilayer WSe₂

2018/01/10 by Hema C. P. Movva, Timothy Lovorn, Babak Fallahazad +7 · 2 citations
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.120.107703

published as Phys. Rev. Lett. 120, 107703 (2018) · 5 pages, 4 figures, includes supplementary material

arxiv created 2018/01/10 · arxiv updated 2018/03/12

Abstract

We present a combined experimental and theoretical study of valley populations in the valence bands of trilayer WSe₂. Shubnikov-de Haas oscillations show that trilayer holes populate two distinct subbands associated with the K and Γ valleys, with effective masses 0.5m_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 Γ orbitals to K orbitals. We are able to explain this behavior in terms of the larger layer polarizability of the K orbital subband.

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