Evidence of pair-density wave (PDW) in spin-valley locked systems

phys.org | 4/9/2019 | Staff
joseph76 (Posted by) Level 3
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Effect of chemical potential on the simulated PDW phase structure demonstrated in the study. The phase of the bond-centered singlet superconducting order parameter, for nearest-neighbors on the 3 × 36 lattice with random pair-edge-field where a larger chemical potential of µ = 6.0 is used rather than µ = 4.6. Here, the line thickness is proportional to the amplitude. The lattice has periodic boundary conditions along the short direction and open boundary conditions along the long direction. Increasing the chemical potential, μ, from μ = 4.6 to μ = 6.0 only enlarges the unit cell by an additional lattice site. Credit: Science Advances, doi: 10.1126/sciadv.aat4698.

The isolation of graphene more than a decade ago transformed the landscape of condensed-matter physics, as the single-atom-thick, two-dimensional material exhibited high crystal and electronic quality to represent a conceptually new class of quantum materials. Physicists and engineers have since explored a vast family of two-dimensional crystals known as transition metal dichalcogenides (TMDs) in which electrons exist in layers with insulating, conducting or semiconducting properties, although little attention has been directed to investigate superconductivity in the 2-D crystals. Ongoing work in the field continues to provide surprisingly fertile ground for applications in low dimensional physics.

Discoveries - Tc - Superconductors - Interest - Pair-density

Recent discoveries in high Tc superconductors have resulted in an intense interest in a "pair-density wave" (PDW) formed in Cooper pairs (an electron pair bound together at low temperatures), although there is little theoretical understanding on the driving mechanisms of this exotic state. The complexity results from the many competing states that are in close energy in the strongly correlated region within seemingly simple models and phenomena such as the Hubbard model, frustrated magnets and high temperature superconductors. In a recent study, Jordan Venderley and Eun-Ah Kim at the Cornell University, New York, showed that inversion symmetry breaking and resulting spin-valley locking...
(Excerpt) Read more at: phys.org
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