scholarly journals Spin–momentum locking induced non-local voltage in topological insulator nanowire

Nanoscale ◽  
2020 ◽  
Vol 12 (45) ◽  
pp. 22958-22962
Author(s):  
Jen-Ru Chen ◽  
Pok Lam Tse ◽  
Ilya N. Krivorotov ◽  
Jia G. Lu
Keyword(s):  
Topological Insulator ◽  
Surface States ◽  
Voltage Signal ◽  
Topological Surface ◽  
Non Local ◽  
Unique Spin ◽  
Spin Momentum

Unique spin–momentum locking in topological surface states of Sb2Te3 nanowires exhibits an unusual symmetry in non-local voltage signal.

scholarly journals Studies on the origin of the interfacial superconductivity of Sb2Te3/Fe1+yTe heterostructures

2019 ◽  
Vol 117 (1) ◽  
pp. 221-227 ◽  
Author(s):  
Jing Liang ◽  
Yu Jun Zhang ◽  
Xiong Yao ◽  
Hui Li ◽  
Zi-Xiang Li ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Topological Insulator ◽  
Surface States ◽  
The Other ◽  
Majorana Fermions ◽  
Bulk Conductivity ◽  
Indirect Coupling ◽  
Topological Surface ◽  
Excess Fe

The recent discovery of the interfacial superconductivity (SC) of the Bi2Te3/Fe1+yTe heterostructure has attracted extensive studies due to its potential as a novel platform for trapping and controlling Majorana fermions. Here we present studies of another topological insulator (TI)/Fe1+yTe heterostructure, Sb2Te3/Fe1+yTe, which also has an interfacial 2-dimensional SC. The results of transport measurements support that reduction of the excess Fe concentration of the Fe1+yTe layer not only increases the fluctuation of its antiferromagnetic (AFM) order but also enhances the quality of the SC of this heterostructure system. On the other hand, the interfacial SC of this heterostructure was found to have a wider-ranging TI-layer thickness dependence than that of the Bi2Te3/Fe1+yTe heterostructure, which is believed to be attributed to the much higher bulk conductivity of Sb2Te3that enhances indirect coupling between its top and bottom topological surface states (TSSs). Our results provide evidence of the interplay among the AFM order, itinerant carries from the TSSs, and the induced interfacial SC of the TI/Fe1+yTe heterostructure system.

scholarly journals Manifestation of axion electrodynamics through magnetic ordering on edges of a topological insulator

2015 ◽  
Vol 112 (37) ◽  
pp. 11514-11518 ◽  
Author(s):  
Yea-Lee Lee ◽  
Hee Chul Park ◽  
Jisoon Ihm ◽  
Young-Woo Son
Keyword(s):  
Electric Field ◽  
Topological Insulator ◽  
Time Reversal ◽  
First Principles ◽  
Surface States ◽  
Magnetic Ordering ◽  
Crystal Face ◽  
Magnetic Dipoles ◽  
Topological Surface ◽  
The Difference

Because topological surface states of a single-crystal topological insulator can exist on all surfaces with different crystal orientations enclosing the crystal, mutual interactions among those states contiguous to each other through edges can lead to unique phenomena inconceivable in normal insulators. Here we show, based on a first-principles approach, that the difference in the work function between adjacent surfaces with different crystal-face orientations generates a built-in electric field around facet edges of a prototypical topological insulator such as Bi2Se3. Owing to the topological magnetoelectric coupling for a given broken time-reversal symmetry in the crystal, the electric field, in turn, forces effective magnetic dipoles to accumulate along the edges, realizing the facet-edge magnetic ordering. We demonstrate that the predicted magnetic ordering is in fact a manifestation of the axion electrodynamics in real solids.

Quantitative Analysis of Weak Antilocalization Effect of Topological Surface States in Topological Insulator BiSbTeSe2

Nano Letters ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 2450-2455 ◽  
Author(s):  
Hui Li ◽  
Huan-Wen Wang ◽  
Yang Li ◽  
Huachen Zhang ◽  
Shuai Zhang ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Topological Insulator ◽  
Surface States ◽  
Weak Antilocalization ◽  
Topological Surface

Spin‐Momentum Locking in the Gate Tunable Topological Insulator BiSbTeSe 2 in Non‐Local Transport Measurements

2019 ◽  
Vol 5 (12) ◽  
pp. 1900334 ◽  
Author(s):  
Joris A. Voerman ◽  
Chuan Li ◽  
Yingkai Huang ◽  
Alexander Brinkman
Keyword(s):  
Topological Insulator ◽  
Transport Measurements ◽  
Non Local ◽  
Local Transport ◽  
Spin Momentum

scholarly journals Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Zilong Jiang ◽  
Cui-Zu Chang ◽  
Massoud Ramezani Masir ◽  
Chi Tang ◽  
Yadong Xu ◽  
...  
Keyword(s):  
Surface States ◽  
Seebeck Effect ◽  
Spin Seebeck Effect ◽  
Topological Surface ◽  
Spin Momentum

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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