The effect of magnetic impurity (Mn-manganese) incorporation in Bi2Se3 topological insulator

2020 ◽  
Author(s):  
Niladri Sekhar Kander ◽  
Sajib Biswas ◽  
Amal Kumar Das
Keyword(s):  
Topological Insulator ◽  
Magnetic Impurity

scholarly journals Coherent spin transport through helical edge states of topological insulator

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
R. A. Niyazov ◽  
D. N. Aristov ◽  
V. Yu. Kachorovskii
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Topological Insulator ◽  
Spin Transport ◽  
Magnetic Impurity ◽  
Quantum Calculations ◽  
Edge States ◽  
Level Spacing ◽  
Aharonov Bohm ◽  
Coherent Spin

AbstractWe study coherent spin transport through helical edge states of topological insulator tunnel-coupled to metallic leads. We demonstrate that unpolarized incoming electron beam acquires finite polarization after transmission through such a setup provided that edges contain at least one magnetic impurity. The finite polarization appears even in the fully classical regime and is therefore robust to dephasing. There is also a quantum magnetic field-tunable contribution to the polarization, which shows sharp identical Aharonov-Bohm resonances as a function of magnetic flux—with the period hc/2e—and survives at relatively high temperature. We demonstrate that this tunneling interferometer can be described in terms of ensemble of flux-tunable qubits giving equal contributions to conductance and spin polarization. The number of active qubits participating in the charge and spin transport is given by the ratio of the temperature and the level spacing. The interferometer can effectively operate at high temperature and can be used for quantum calculations. In particular, the ensemble of qubits can be described by a single Hadamard operator. The obtained results open wide avenue for applications in the area of quantum computing.

scholarly journals Non-Hermitian indirect exchange interaction in a topological insulator coupled to a ferromagnetic metal

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mir Vahid Hosseini ◽  
Mehdi Askari
Keyword(s):  
Decay Rate ◽  
Topological Insulator ◽  
Magnetic Impurity ◽  
Surface States ◽  
Decay Rates ◽  
Ferromagnetic Metal ◽  
Magnetic Impurities ◽  
Indirect Exchange ◽  
Charge Decay ◽  
Spatial Oscillations

AbstractWe theoretically demonstrate non-Hermitian indirect interaction between two magnetic impurities placed at the interface between a 3D topological insulator and a ferromagnetic metal. The coupling of topological insulator and the ferromagnet introduces not only Zeeman exchange field on the surface states but also broadening to transfer the charge and spin between the surface states of the topological insulator and the metallic states of the ferromagnet. While the former provides bandgap at the charge neutrality point, the latter causes non-Hermiticity. Using the Green’s function method, we calculate the range functions of magnetic impurity interactions. We show that the charge decay rate provides a coupling between evanescent modes near the bandgap and traveling modes near the band edge. However, the spin decay rate induces a stronger coupling than the charge decay rate so that higher energy traveling modes can be coupled to lower energy evanescent ones. This results in a non-monotonic behavior of the range functions in terms of distance and decay rates in the subgap regime. In the over gap regime, depending on the type of decay rate and on the distance, the amplitude of spatial oscillations would be damped or promoted.

scholarly journals Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Lin Miao ◽  
Yishuai Xu ◽  
Wenhan Zhang ◽  
Daniel Older ◽  
S. Alexander Breitweiser ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Magnetic Impurity ◽  
Dirac Cone

Magnetic and Electronic Properties of Gd-Doped Topological Insulator Bi1.09Gd0.06Sb0.85Te3

2019 ◽  
Vol 129 (3) ◽  
pp. 404-412 ◽  
Author(s):  
S. O. Filnov ◽  
Yu. A. Surnin ◽  
A. V. Koroleva ◽  
I. I. Klimovskikh ◽  
D. A. Estyunin ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Topological Insulator

scholarly journals Anomalous Hall effect in a magnetically extended topological insulator heterostructure

2020 ◽  
Vol 4 (9) ◽  
Author(s):  
Nan Liu ◽  
Xuefan Niu ◽  
Yuxin Liu ◽  
Qinghua Zhang ◽  
Lin Gu ◽  
...  
Keyword(s):  
Hall Effect ◽  
Topological Insulator ◽  
Anomalous Hall Effect

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
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