TY - JOUR
T1 - Carrier transport in Bi2Se3 topological insulator slab
AU - Gupta, Gaurav
AU - Lin, Hsin
AU - Bansil, Arun
AU - Jalil, Mansoor Bin Abdul
AU - Liang, Gengchiau
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/7/2
Y1 - 2015/7/2
N2 - Abstractv Electron transport in Bi2Se3 topological insulator slabs is investigated in the thermal activation regime (>50 K) both in the absence (ballistic) and presence of weak and strong acoustic phonon scattering using the non-equilibrium Green function approach. Resistance of the slab is simulated as a function of temperature for a range of slab thicknesses and effective doping in order to gain a handle on how various factors interact and compete to determine the overall resistance of the slab. If the Bi2Se3 slab is biased at the Dirac point, resistance is found to display an insulating trend even for strong electron-phonon coupling strength. However, when the Fermi-level lies close to the bulk conduction band (heavy electron doping), phonon scattering can dominate and result in a metallic behavior, although the insulating trend is retained in the limit of ballistic transport. Depending on values of the operating parameters, the temperature dependence of the slab is found to exhibit a remarkably complex behavior, which ranges from insulating to metallic, and includes cases where the resistance exhibits a local maximum, much like the contradictory behaviors seen experimentally in various experiments.
AB - Abstractv Electron transport in Bi2Se3 topological insulator slabs is investigated in the thermal activation regime (>50 K) both in the absence (ballistic) and presence of weak and strong acoustic phonon scattering using the non-equilibrium Green function approach. Resistance of the slab is simulated as a function of temperature for a range of slab thicknesses and effective doping in order to gain a handle on how various factors interact and compete to determine the overall resistance of the slab. If the Bi2Se3 slab is biased at the Dirac point, resistance is found to display an insulating trend even for strong electron-phonon coupling strength. However, when the Fermi-level lies close to the bulk conduction band (heavy electron doping), phonon scattering can dominate and result in a metallic behavior, although the insulating trend is retained in the limit of ballistic transport. Depending on values of the operating parameters, the temperature dependence of the slab is found to exhibit a remarkably complex behavior, which ranges from insulating to metallic, and includes cases where the resistance exhibits a local maximum, much like the contradictory behaviors seen experimentally in various experiments.
KW - Acoustic Phonons
KW - NEGF
KW - Quantum Transport
KW - Resistance
KW - Topological Insulator
UR - http://www.scopus.com/inward/record.url?scp=84933523571&partnerID=8YFLogxK
U2 - 10.1016/j.physe.2015.06.003
DO - 10.1016/j.physe.2015.06.003
M3 - Article
AN - SCOPUS:84933523571
SN - 1386-9477
VL - 74
SP - 10
EP - 19
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
M1 - 11990
ER -