scholarly journals Spin-polarized STM spectra of Dirac electrons on the surface of a topological insulator

2011 ◽  
Vol 84 (16) ◽  
Author(s):  
K. Saha ◽  
Sourin Das ◽  
K. Sengupta ◽  
Diptiman Sen
Keyword(s):  
Topological Insulator ◽  
Spin Polarized

scholarly journals The impact of metallic contacts on spin-polarized photocurrents in topological insulator Bi 2 Se 3 nanowires

2020 ◽  
Vol 117 (26) ◽  
pp. 262401
Author(s):  
N. Meyer ◽  
K. Geishendorf ◽  
J. Walowski ◽  
A. Thomas ◽  
M. Münzenberg
Keyword(s):  
Topological Insulator ◽  
Metallic Contacts ◽  
Spin Polarized ◽  
The Impact

scholarly journals Electrical detection of spin-polarized current in topological insulator Bi1.5Sb0.5Te1.7Se1.3

2019 ◽  
Vol 19 (8) ◽  
pp. 917-923 ◽  
Author(s):  
Tae-Ha Hwang ◽  
Hong-Seok Kim ◽  
Hoil Kim ◽  
Jun Sung Kim ◽  
Yong-Joo Doh
Keyword(s):  
Topological Insulator ◽  
Electrical Detection ◽  
Spin Polarized

scholarly journals Spin-Polarized Angle-Resolved Photoelectron Spectroscopy of the So-Predicted Kondo Topological Insulator SmB6

2014 ◽  
Vol 83 (1) ◽  
pp. 014705 ◽  
Author(s):  
Shigemasa Suga ◽  
Kazuyuki Sakamoto ◽  
Taichi Okuda ◽  
Koji Miyamoto ◽  
Kenta Kuroda ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Photoelectron Spectroscopy ◽  
Spin Polarized

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.

scholarly journals Topological insulator metamaterial with giant circular photogalvanic effect

2021 ◽  
Vol 7 (14) ◽  
pp. eabe5748
Author(s):  
X. Sun ◽  
G. Adamo ◽  
M. Eginligil ◽  
H. N. S. Krishnamoorthy ◽  
N. I. Zheludev ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Structural Design ◽  
Surface States ◽  
Optical Excitation ◽  
Fold Increase ◽  
Photogalvanic Effect ◽  
Spin Electronics ◽  
Spin Polarized ◽  
Polarized Surface ◽  
Spin Momentum

One of the most notable manifestations of electronic properties of topological insulators is the dependence of the photocurrent direction on the helicity of circularly polarized optical excitation. The helicity-dependent photocurrents, underpinned by spin-momentum locking of surface Dirac electrons, are weak and easily overshadowed by bulk contributions. Here, we show that the chiral response can be enhanced by nanostructuring. The tight confinement of electromagnetic fields in the resonant nanostructure enhances the photoexcitation of spin-polarized surface states of topological insulator Bi1.5Sb0.5Te1.8Se1.2, leading to an 11-fold increase of the circular photogalvanic effect and a previously unobserved photocurrent dichroism (ρcirc = 0.87) at room temperature. The control of spin transport in topological materials by structural design is a previously unrecognized ability of metamaterials that bridges the gap between nanophotonics and spin electronics, providing opportunities for developing polarization-sensitive photodetectors.

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