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 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 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 Experimental realization of two-dimensional synthetic spin–orbit coupling in ultracold Fermi gases

2016 ◽  
Vol 12 (6) ◽  
pp. 540-544 ◽  
Author(s):  
Lianghui Huang ◽  
Zengming Meng ◽  
Pengjun Wang ◽  
Peng Peng ◽  
Shao-Liang Zhang ◽  
...  
Keyword(s):  
Orbit Coupling ◽  
Fermi Gases ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Two Dimensional ◽  
Experimental Realization ◽  
Ultracold Fermi Gases

Weakly interacting spinor Bose–Einstein condensates with three-dimensional spin–orbit coupling

2016 ◽  
Vol 25 (4) ◽  
pp. 040305 ◽  
Author(s):  
Shu-Wei Song ◽  
Rui Sun ◽  
Hong Zhao ◽  
Xuan Wang ◽  
Bao-Zhong Han
Keyword(s):  
Three Dimensional ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Weakly Interacting ◽  
Bose Einstein

scholarly journals Exotic pairing states in a Fermi gas with three-dimensional spin-orbit coupling

2013 ◽  
Vol 87 (6) ◽  
Author(s):  
Xiang-Fa Zhou ◽  
Guang-Can Guo ◽  
Wei Zhang ◽  
Wei Yi
Keyword(s):  
Three Dimensional ◽  
Fermi Gas ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit
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