Half quantum vortices in a nematic superconductor

Nematic superconductivity in the topological semimetal CaSn3

“…This unexpected behavior could be the fingerprint of a nontrivial vortex phase. Such unconventional picture has been predicted to occur in superconductors with a multicomponent order parameter [48][49][50]. Therefore, the present finding represents additional evidence of nematicity in the superconducting state of CaSn 3 .…”

Shear modulus anomaly of multi-conponent superconductor: the case of Mx Bi2Se3

“…To settle the issue, we believe a directly test for the multi-component nature of the order parameter in some other way is needed. To this end, the present author and collaborator have examined the extended phase diagram of the material under applied stress [18], and the physics of half vortices in such a nematic superconductor [22]. As an s-wave order parameter is forbidden by symmetry to couple linearly couple with shear strain, the shear modulus anomaly may prove to be the most promising test yet.…”

Fractional Skyrmion molecules in a ℂPN−1 model

“…The so-called Feynman-Onsager's quantization condition makes the circulation of superfluids or magnetic flux of superconductors quantized integers due to the singlevaluedness of the wave function, or more mathematically due to fact that they belong to the first homotopy group π 1 . Nevertheless, fractionally quantized vortices are ubiquitously allowed in diverse condensed matter systems with multiple components, such as the A phase of superfluid 3 He [5,6], the uniaxially disordered superfluid 3 He [7,8], unconventional superconductors [9][10][11][12][13][14], multicomponent superconductors [15][16][17][18][19][20][21][22][23][24][25][26], spinor Bose-Einstein condensates (BECs) [27][28][29][30][31][32][33][34], multicomponent BECs [35][36][37][38][39][40][41][42][43][44][45][46][47], 3 P 2 neutron superfluids [48,49], exciton-polarito...…”