Volume 118, Number 1, April 2017
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 May 2017|
Zeeman- and electric-field control of spin- and valley-polarized transport through biased magnetic junctions on WSe2
1 Department of Physics, College of Science, University of Hafr Al Batin - P.O. Box 1803, Hafr Al Batin 31991, Kingdom of Saudi Arabia
2 Center of Microelectronic Technologies and Single Crystals (IHTM), University of Belgrade Njegoševa 12, 11000 Belgrade, Serbia
3 Department of Physics, Concordia University - 7141 Sherbrooke West, Montreal, Quebec, H4B 1R6, Canada
Received: 27 February 2017
Accepted: 10 May 2017
The electronic properties of WSe2 comprise a huge spin-orbit coupling, a wide direct band gap, and especially a strong anisotropic lifting of the degeneracy of the valley degree of freedom in a magnetic field. We study ballistic electron transport through single or double junctions on monolayer WSe2 in the presence of spin Ms and valley Mv Zeeman fields and of an electric potential U. The conductance vs. the field Ms or Mv decreases in a fluctuating manner. For a single junction the spin Ps and valley Pv polarizations rise with , reach a value of more than 70%, and become perfect above while for a double junction this change can occur for and . Pv increases with U and both polarizations oscillate with the junction width. The results may render WSe2 a promising candidate for new spintronic and valleytronic devices.
PACS: 73.40.Gk – Tunneling / 74.55.+v – Tunneling phenomena: single particle tunneling and STM / 72.25.-b – Spin polarized transport
© EPLA, 2017
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