scholarly journals Spin-polarized tunneling current through a thin film of a topological insulator in a parallel magnetic field

2012 ◽  
Vol 86 (16) ◽  
Author(s):  
Sergey S. Pershoguba ◽  
Victor M. Yakovenko
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Topological Insulator ◽  
Tunneling Current ◽  
Parallel Magnetic Field ◽  
Spin Polarized ◽  
Spin Polarized Tunneling

Detecting Larmor Precession of a Single Spin with a Spin-Polarized Tunneling Current

2013 ◽  
Vol 30 (1) ◽  
pp. 017601 ◽  
Author(s):  
Xiao-Dong Guo ◽  
Li Dong ◽  
Yang Guo ◽  
Xin-Yan Shan ◽  
Ji-Min Zhao ◽  
...  
Keyword(s):  
Tunneling Current ◽  
Larmor Precession ◽  
Single Spin ◽  
Spin Polarized ◽  
Spin Polarized Tunneling

NUMERICAL STUDY OF TRANSPORT PROPERTIES IN TOPOLOGICAL INSULATOR QUANTUM DOTS UNDER MAGNETIC FIELD

2013 ◽  
Vol 27 (14) ◽  
pp. 1350104 ◽  
Author(s):  
SHENG-NAN ZHANG ◽  
HUA JIANG ◽  
HAIWEN LIU
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Transport Properties ◽  
Topological Insulator ◽  
Numerical Study ◽  
Spin Polarized ◽  
Full Band ◽  
Spin Degeneracy ◽  
Aharonov Bohm ◽  
The Magnetic Field

In this paper, we investigate the transport properties of HgTe / CdTe -based topological insulator quantum dots (TIQDs) under magnetic field. Both disk and square shaped TIQDs are considered and the magneto-conductance are calculated numerically for various magnetic field strength. The magnetic field lifts the spin degeneracy, leading to spin polarized current at given Fermi energy. Meanwhile, the magneto-conductance demonstrates the Aharonov–Bohm (AB) oscillation with a period of one flux quantum [Formula: see text]. Numerical results for AB oscillation features indicate the mismatch between electron (e) and hole (h) doping conditions, which can be attributed to the e–h asymmetry in the full band Hamiltonian. Further, interference effect emerges around bulk and edge energy degenerate points, subsequently suppressing the magneto-conductance in both shaped systems. All these physical characteristics are qualitatively consistent for disk and square shaped TIQDs due to the topological nature of edge modes.

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