scholarly journals Prediction of spin polarized Fermi arcs in quasiparticle interference in CeBi

2020 ◽  
Vol 102 (23) ◽  
Author(s):  
Zhao Huang ◽  
Christopher Lane ◽  
Chao Cao ◽  
Guo-Xiang Zhi ◽  
Yu Liu ◽  
...  
Keyword(s):  
Quasiparticle Interference ◽  
Fermi Arcs ◽  
Spin Polarized

scholarly journals Observation of spin-polarized bands and domain-dependent Fermi arcs in polar Weyl semimetal MoTe2

2017 ◽  
Vol 95 (12) ◽  
Author(s):  
M. Sakano ◽  
M. S. Bahramy ◽  
H. Tsuji ◽  
I. Araya ◽  
K. Ikeura ◽  
...  
Keyword(s):  
Weyl Semimetal ◽  
Fermi Arcs ◽  
Spin Polarized

scholarly journals Electrically controlled spin polarized current in Dirac semimetals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Qianqian Lv ◽  
Pei-Hao Fu ◽  
Xiang-Long Yu ◽  
Jun-Feng Liu ◽  
Jiansheng Wu
Keyword(s):  
Coupling Strength ◽  
Gate Voltage ◽  
Chemical Potential ◽  
Density Of State ◽  
Electrical Parameters ◽  
Spintronic Device ◽  
Dirac Semimetal ◽  
Fermi Arcs ◽  
Spin Polarized ◽  
Dirac Semimetals

AbstractWe propose a highly tunable $$100\%$$ 100 % spin-polarized current generated in a spintronic device based on a Dirac semimetal (DSM) under a magnetic field, which can be achieved merely by controlling electrical parameters, i.e. the gate voltage, the chemical potential in the lead and the coupling strength between the leads and the DSM. These parameters are all related to the special properties of a semimetal. The spin polarized current generated by gate voltage is guaranteed by its semimetallic feature, because of which the density of state vanishes near Dirac nodes. The barrier controlled current results from the different distance of Weyl nodes generated by the Zeeman field. And the coupling strength controlled spin polarized current originates from the surface Fermi arcs. This DSM-based spintronic device is expected to be realized in $$\hbox {Cd}_{3}\hbox {As}_{2}$$ Cd 3 As 2 experimentally.

scholarly journals Observation of higher-order non-Hermitian skin effect

2021 ◽  
Author(s):  
Xiujuan Zhang ◽  
Yuan Tian ◽  
Jian-Hua Jiang ◽  
Ming-Hui Lu ◽  
Yan-Feng Chen
Keyword(s):  
Degrees Of Freedom ◽  
Skin Effect ◽  
Higher Order ◽  
Dependent Manner ◽  
Acoustic Metamaterials ◽  
Opposite Edge ◽  
Band Theory ◽  
Acoustic Resonators ◽  
Fermi Arcs ◽  
Spin Polarized

Abstract Hermitian theories play a major role in understanding the physics of most phenomena. It has been found only in the past decade that non-Hermiticity enables unprecedented effects such as exceptional points, spectral singularities and bulk Fermi arcs. Recent studies further show that non-Hermiticity can fundamentally change the topological band theory, leading to the non-Hermitian band topology and non-Hermitian skin effect, as confirmed in one-dimensional (1D) systems. However, in higher dimensions, these non-Hermitian effects remain unexplored in experiments. Here, we demonstrate the spin-polarized, higher-order non-Hermitian skin effect in two-dimensional (2D) acoustic metamaterials. Using a lattice of coupled whisper-gallery acoustic resonators, we realize a spinful 2D higher-order topological insulator (HOTI) where the spin-up and spin-down states are emulated by the anti-clockwise and clockwise modes, respectively. We find that the non-Hermiticity drives wave localizations toward opposite edge boundaries depending on the spin polarizations. More interestingly, for finite systems with both edge and corner boundaries, the higher-order non-Hermitian skin effect leads to wave localizations toward two corner boundaries for the bulk, edge and corner states in a spin-dependent manner. We further show that such a non-Hermitian skin effect enables rich wave manipulation through the loss configuration in each unit-cell. The reported spin-dependent, higher-order non-Hermitian skin effect reveals the interplay between higher-order topology and non-Hermiticity, which is further enriched by the spin degrees of freedom. This unveils a new horizon in the study of non-Hermitian physics and the design of non-Hermitian metamaterials.

Quasiparticle interference scattering of spin-polarized Shockley-like surface state electrons: Ni(111)

2014 ◽  
Vol 89 (15) ◽  
Author(s):  
Andreas Krönlein ◽  
Jeannette Kemmer ◽  
Pin-Jui Hsu ◽  
Matthias Bode
Keyword(s):  
Surface State ◽  
Quasiparticle Interference ◽  
Spin Polarized

scholarly journals Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Davide Iaia ◽  
Guoqing Chang ◽  
Tay-Rong Chang ◽  
Jin Hu ◽  
Zhiqiang Mao ◽  
...  
Keyword(s):  
Type Ii ◽  
Quasiparticle Interference ◽  
Weyl Semimetal ◽  
Fermi Arcs

scholarly journals Quasiparticle interference of the Fermi arcs and surface-bulk connectivity of a Weyl semimetal

Science ◽  
2016 ◽  
Vol 351 (6278) ◽  
pp. 1184-1187 ◽  
Author(s):  
Hiroyuki Inoue ◽  
András Gyenis ◽  
Zhijun Wang ◽  
Jian Li ◽  
Seong Woo Oh ◽  
...  
Keyword(s):  
Quasiparticle Interference ◽  
Weyl Semimetal ◽  
Fermi Arcs

Revealing Fermi arcs and Weyl nodes in MoTe2 by quasiparticle interference mapping

2017 ◽  
Vol 95 (24) ◽  
Author(s):  
Peng Deng ◽  
Zhilin Xu ◽  
Ke Deng ◽  
Kenan Zhang ◽  
Yang Wu ◽  
...  
Keyword(s):  
Quasiparticle Interference ◽  
Fermi Arcs ◽  
Interference Mapping

scholarly journals Observation of backscattering induced by magnetism in a topological edge state

2020 ◽  
Vol 117 (28) ◽  
pp. 16214-16218 ◽  
Author(s):  
Berthold Jäck ◽  
Yonglong Xie ◽  
B. Andrei Bernevig ◽  
Ali Yazdani
Keyword(s):  
Time Reversal ◽  
Edge State ◽  
Quantum Spin ◽  
Scanning Tunneling ◽  
Edge States ◽  
Quantum Spin Hall Effect ◽  
Quasiparticle Interference ◽  
Spin Polarized ◽  
Ferromagnetic Iron ◽  
Bilayer Edge

The boundary modes of topological insulators are protected by the symmetries of the nontrivial bulk electronic states. Unless these symmetries are broken, they can give rise to novel phenomena, such as the quantum spin Hall effect in one-dimensional (1D) topological edge states, where quasiparticle backscattering is suppressed by time-reversal symmetry (TRS). Here, we investigate the properties of the 1D topological edge state of bismuth in the absence of TRS, where backscattering is predicted to occur. Using spectroscopic imaging and spin-polarized measurements with a scanning tunneling microscope, we compared quasiparticle interference (QPI) occurring in the edge state of a pristine bismuth bilayer with that occurring in the edge state of a bilayer, which is terminated by ferromagnetic iron clusters that break TRS. Our experiments on the decorated bilayer edge reveal an additional QPI branch, which can be associated with spin-flip scattering across the Brioullin zone center between time-reversal band partners. The observed QPI characteristics exactly match with theoretical expectations for a topological edge state, having one Kramer’s pair of bands. Together, our results provide further evidence for the nontrivial nature of bismuth and in particular, demonstrate backscattering inside a helical topological edge state induced by broken TRS through local magnetism.

scholarly journals Universal signatures of Fermi arcs in quasiparticle interference on the surface of Weyl semimetals

2016 ◽  
Vol 93 (4) ◽  
Author(s):  
Stefanos Kourtis ◽  
Jian Li ◽  
Zhijun Wang ◽  
Ali Yazdani ◽  
B. Andrei Bernevig
Keyword(s):  
Quasiparticle Interference ◽  
Fermi Arcs ◽  
Weyl Semimetals

scholarly journals Electrically controlled spin polarized current in Dirac semimetals

2021 ◽  
Author(s):  
Qianqian Lv ◽  
Pei-Hao Fu ◽  
Xiang-Long Yu ◽  
Jun-Feng Liu ◽  
Jiansheng Wu
Keyword(s):  
Coupling Strength ◽  
Gate Voltage ◽  
Density Of State ◽  
Spintronic Devices ◽  
Dirac Semimetal ◽  
Weyl Semimetal ◽  
Fermi Arcs ◽  
Spin Polarized ◽  
Electric Parameters ◽  
Spintronics Device

Abstract We propose a highly tunable 100% spin-polarized current generated in a spintronics device based on Dirac semimetal under a magnetic field, which can be achieved merely by controlling electric parameters, i.e. the gate voltage, the barrier in the lead and the coupling strength between the leads and Dirac semimetal. These parameters are all related to the special properties of Dirac semimetal and Weyl semimetal. The spin polarized current generated by gate voltage is guaranteed by its semimetallic feature, because of which the density of state vanishes near Dirac nodes. The barrier controlled current results from the different distance of Weyl nodes generated by the Zeeman field. And the coupling strength controlled spin polarized current originate from the surface Fermi arcs. All these features make a great potential to realized Dirac semimetal based spintronic devices.

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