Tunable Γ-K Valley Populations in Hole-Doped Trilayer WSe_{2}.

Autor: Movva HCP; Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA., Lovorn T; Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA., Fallahazad B; Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA., Larentis S; Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA., Kim K; Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA., Taniguchi T; National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan., Watanabe K; National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan., Banerjee SK; Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA., MacDonald AH; Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA., Tutuc E; Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2018 Mar 09; Vol. 120 (10), pp. 107703.
DOI: 10.1103/PhysRevLett.120.107703
Abstrakt: 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 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.
Databáze: MEDLINE