Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4903248
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Funding
- Canadian NSERC [OGP0121756]
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We study ballistic electron transport through silicene barriers, of width d and height U, in the presence of an exchange field M and a normal electric field E-z. Away from the Dirac point (DP), the spin- and valley-resolved conductances, as functions of U, exhibit resonances while close to it there is a pronounced dip that can be transformed into a transport gap by varying E-z. The charge conductance g(c) changes from oscillatory to a monotonically decreasing function of d beyond a critical E-z and this can be used to realize electric-field-controlled switching. Further, the field M splits each resonance of gc into two spin-resolved peaks. The spin polarization near the DP increases with E-z or M and becomes nearly perfect above certain of their values. Similar results hold for double barriers. (C) 2014 AIP Publishing LLC.
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