scholarly journals Ideal Weyl semimetal with 3D spin-orbit coupled ultracold quantum gas

2020 ◽  
Vol 65 (24) ◽  
pp. 2080-2085
Author(s):  
Yue-Hui Lu ◽  
Bao-Zong Wang ◽  
Xiong-Jun Liu
Keyword(s):  
Spin Orbit ◽  
Quantum Gas ◽  
Weyl Semimetal

scholarly journals Realization of an ideal Weyl semimetal band in a quantum gas with 3D spin-orbit coupling

Science ◽  
2021 ◽  
Vol 372 (6539) ◽  
pp. 271-276 ◽  
Author(s):  
Zong-Yao Wang ◽  
Xiang-Can Cheng ◽  
Bao-Zong Wang ◽  
Jin-Yi Zhang ◽  
Yue-Hui Lu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Quantum Gas ◽  
Experimental Realization ◽  
Weyl Semimetal ◽  
Minimum Number ◽  
Quench Dynamics ◽  
Bulk Band

Weyl semimetals are three-dimensional (3D) gapless topological phases with Weyl cones in the bulk band. According to lattice theory, Weyl cones must come in pairs, with the minimum number of cones being two. A semimetal with only two Weyl cones is an ideal Weyl semimetal (IWSM). Here we report the experimental realization of an IWSM band by engineering 3D spin-orbit coupling for ultracold atoms. The topological Weyl points are clearly measured via the virtual slicing imaging technique in equilibrium and are further resolved in the quench dynamics. The realization of an IWSM band opens an avenue to investigate various exotic phenomena that are difficult to access in solids.

scholarly journals Low-Energy Optical Conductivity of TaP: Comparison of Theory and Experiment

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 567
Author(s):  
Alexander Yaresko ◽  
Artem V. Pronin
Keyword(s):  
Experimental Data ◽  
Optical Conductivity ◽  
Low Energy ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Natural Explanation ◽  
Weyl Semimetal ◽  
Unintentional Doping ◽  
Mott Formula ◽  
Theory And Experiment

The ab-plane optical conductivity of the Weyl semimetal TaP is calculated from the band structure and compared to the experimental data. The overall agreement between theory and experiment is found to be best when the Fermi level is slightly (20 to 60 meV) shifted upwards in the calculations. This confirms a small unintentional doping of TaP, reported earlier, and allows a natural explanation of the strong low-energy (50 meV) peak seen in the experimental ab-plane optical conductivity: this peak originates from transitions between the almost parallel non-degenerate electronic bands split by spin-orbit coupling. The temperature evolution of the peak can be reasonably well reproduce by calculations using an analog of the Mott formula.

scholarly journals Magnetization switching induced by spin–orbit torque from Co2MnGa magnetic Weyl semimetal thin films

2021 ◽  
Vol 118 (6) ◽  
pp. 062402
Author(s):  
Ke Tang ◽  
Zhenchao Wen ◽  
Yong-Chang Lau ◽  
Hiroaki Sukegawa ◽  
Takeshi Seki ◽  
...  
Keyword(s):  
Thin Films ◽  
Spin Orbit ◽  
Magnetization Switching ◽  
Weyl Semimetal

scholarly journals Sum rules, dipole oscillation and spin polarizability of a spin-orbit coupled quantum gas

2012 ◽  
Vol 99 (5) ◽  
pp. 56008 ◽  
Author(s):  
Yun Li ◽  
Giovanni Italo Martone ◽  
Sandro Stringari
Keyword(s):  
Sum Rules ◽  
Spin Orbit ◽  
Quantum Gas ◽  
Spin Polarizability ◽  
Dipole Oscillation

scholarly journals Strong spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2S2 : Role of spin-orbit coupling

2020 ◽  
Vol 102 (10) ◽  
Author(s):  
Sandeep Howlader ◽  
Surabhi Saha ◽  
Ritesh Kumar ◽  
Vipin Nagpal ◽  
Satyabrata Patnaik ◽  
...  
Keyword(s):  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Weyl Semimetal ◽  
Spin Depolarization ◽  
Strong Spin

scholarly journals New type of Weyl semimetal with quadratic double Weyl fermions

2016 ◽  
Vol 113 (5) ◽  
pp. 1180-1185 ◽  
Author(s):  
Shin-Ming Huang ◽  
Su-Yang Xu ◽  
Ilya Belopolski ◽  
Chi-Cheng Lee ◽  
Guoqing Chang ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Experimental Realization ◽  
Weyl Semimetal ◽  
Chiral Magnetic Effect ◽  
Wide Range ◽  
Weyl Semimetals ◽  
Weyl Fermions

Weyl semimetals have attracted worldwide attention due to their wide range of exotic properties predicted in theories. The experimental realization had remained elusive for a long time despite much effort. Very recently, the first Weyl semimetal has been discovered in an inversion-breaking, stoichiometric solid TaAs. So far, the TaAs class remains the only Weyl semimetal available in real materials. To facilitate the transition of Weyl semimetals from the realm of purely theoretical interest to the realm of experimental studies and device applications, it is of crucial importance to identify other robust candidates that are experimentally feasible to be realized. In this paper, we propose such a Weyl semimetal candidate in an inversion-breaking, stoichiometric compound strontium silicide, SrSi2, with many new and novel properties that are distinct from TaAs. We show that SrSi2 is a Weyl semimetal even without spin–orbit coupling and that, after the inclusion of spin–orbit coupling, two Weyl fermions stick together forming an exotic double Weyl fermion with quadratic dispersions and a higher chiral charge of ±2. Moreover, we find that the Weyl nodes with opposite charges are located at different energies due to the absence of mirror symmetry in SrSi2, paving the way for the realization of the chiral magnetic effect. Our systematic results not only identify a much-needed robust Weyl semimetal candidate but also open the door to new topological Weyl physics that is not possible in TaAs.

scholarly journals Spin-momentum locking and spin-orbit torques in magnetic nano-heterojunctions composed of Weyl semimetal WTe2

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Peng Li ◽  
Weikang Wu ◽  
Yan Wen ◽  
Chenhui Zhang ◽  
Junwei Zhang ◽  
...  
Keyword(s):  
Spin Orbit ◽  
Weyl Semimetal ◽  
Spin Momentum

scholarly journals Kramers Weyl semimetals as quantum solenoids and their applications in spin-orbit torque devices

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Wen-Yu He ◽  
Xiao Yan Xu ◽  
K. T. Law
Keyword(s):  
Time Reversal ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Orbit ◽  
Longitudinal Magnetization ◽  
Spin Magnetization ◽  
Weyl Semimetal ◽  
Electric Control ◽  
Lattice Symmetry ◽  
Weyl Semimetals ◽  
Chiral Crystals

AbstractKramers Weyl semimetals are Weyl semimetals that have Weyl points pinned at the time reversal invariant momenta. Recently it has been discovered that all chiral crystals host Weyl points at time reversal invariant momenta, so metals with chiral lattice symmetry all belong to the category of Kramers Weyl semimetals. In this work, we show that due to the chiral lattice symmetry, Kramers Weyl semimetals have the unique longitudinal magnetoelectric effect in which the charge current induced spin and orbital magnetization is parallel to the direction of the current. This feature allows Kramers Weyl semimetals to act as nanoscale quantum solenoids with both orbital and spin magnetization. As the moving electrons of Kramers Weyl semimetal can generate longitudinal magnetization, Kramers Weyl semimetals can be used for new designs of spin-orbit torque devices with all electric control of magnetization switching for magnets with perpendicular magnetic anisotropy.

scholarly journals Raman-dressed spin-1 spin-orbit-coupled quantum gas

2014 ◽  
Vol 89 (2) ◽  
Author(s):  
Zhihao Lan ◽  
Patrik Öhberg
Keyword(s):  
Spin Orbit ◽  
Quantum Gas

scholarly journals Quantum transport in Weyl semimetal thin films in the presence of spin-orbit coupled impurities

2017 ◽  
Vol 96 (4) ◽  
Author(s):  
Weizhe Edward Liu ◽  
Ewelina M. Hankiewicz ◽  
Dimitrie Culcer
Keyword(s):  
Thin Films ◽  
Quantum Transport ◽  
Spin Orbit ◽  
Weyl Semimetal
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