Synthetic spinorbit coupling mediated by a bosonic environment
Abstract
We study a mobile quantum impurity, possessing internal rotational degrees of freedom, confined to a ring in the presence of a manyparticle bosonic bath. By considering the recently introduced rotating polaron problem, we define the Hamiltonian and examine the energy spectrum. The weakcoupling regime is studied by means of a variational ansatz in the truncated Fock space. The corresponding spectrum indicates that there emerges a coupling between the internal and orbital angular momenta of the impurity as a consequence of the phonon exchange. We interpret the coupling as a phononmediated spinorbit coupling and quantify it by using a correlation function between the internal and the orbital angular momentum operators. The strongcoupling regime is investigated within the Pekar approach, and it is shown that the correlation function of the ground state shows a kink at a critical coupling, that is explained by a sharp transition from the noninteracting state to the states that exhibit strong interaction with the surroundings. The results might find applications in such fields as spintronics or topological insulators where spinorbit coupling is of crucial importance.
 Publication:

Physical Review B
 Pub Date:
 May 2020
 DOI:
 10.1103/PhysRevB.101.184104
 arXiv:
 arXiv:1912.03092
 Bibcode:
 2020PhRvB.101r4104M
 Keywords:

 Condensed Matter  Quantum Gases;
 Condensed Matter  Mesoscale and Nanoscale Physics;
 Condensed Matter  Other Condensed Matter;
 Physics  Atomic and Molecular Clusters;
 Physics  Atomic Physics
 EPrint:
 8 pages, 5 figures