Low Temperature Physics: 46, 507 (2020); https://doi.org/10.1063/10.0001055
Persistent currents in the two-chain correlated electron model
Max-Planck-Institut für Physik komplexer Systeme, 38 Nöthnitzer Str., Dresden D-01187, Germany
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
V.N. Karazin Kharkiv National University, 4 Svoboda Sq., Kharkiv 61022, Ukraine
Received November 8, 2019, published online March 24, 2020
For the recently proposed exactly solvable two-chain correlated electron model with the anisotropic spin-spin interaction between electrons and the spin-orbit interaction the ground state persistent currents are calculated. The model describes the quasi-one-dimensional type II superconductor. It is shown, that the spin-orbit coupling determines the initial phase of oscillations of charge and spin persistent currents, related to unbound electron states. On the other hand, Cooper-like singlet pairs define oscillations of only charge persistent currents with the period, characteristic to pairs. Depending on the value of the external magnetic field and the band filling, the system can reveal the complicated picture of the interference of several kinds of oscillations.
Key words: integrable models, anisotropy, persistent currents.