Volume 87, Number 4, August 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 September 2009|
Spin-orbit effects in a graphene bipolar pn junction
Department of Physics, Tohoku University - Sendai, 980-8578, Japan
2 Condensed Matter Theory Group, CPMOH, UMR 5798, Université Bordeaux I - 33405 Talence, France, EU
Corresponding author: firstname.lastname@example.org
Accepted: 7 August 2009
A graphene pn junction is studied theoretically in the presence of both intrinsic and Rashba spin-orbit couplings. We show that a crossover from perfect reflection to perfect transmission is achieved at normal incidence by tuning the perpendicular electric field. By further studying angular-dependent transmission, we demonstrate that perfect reflection at normal incidence can be clearly distinguished from trivial band gap effects. We also investigate how spin-orbit effects modify the conductance and the Fano factor associated with a potential step in both nn and np cases.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 73.63.-b – Electronic transport in nanoscale materials and structures / 73.40.-c – Electronic transport in interface structures
© EPLA, 2009
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