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MO: Fachverband Molekülphysik

MO 17: Theory

MO 17.4: Vortrag

Donnerstag, 12. März 2020, 14:45–15:00, f142

Synthetic spin-orbit coupling mediated by a bosonic environment — •Mikhail Maslov, Mikhail Lemeshko, and Enderalp Yakaboylu — Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria

We study a mobile quantum impurity, possessing internal rotational degrees of freedom, confined on a circular ring in the presence of a many-particle bath. By considering the recently introduced rotating polaron problem [1], we define the Hamiltonian and examine the energy spectrum. The weak-coupling regime is studied by means of a variational ansatz in the truncated Fock space. The corresponding spectrum, presented for selected angular quantum numbers of the impurity, indicates the emergence of a coupling between the angular momenta of circular motion and internal impurity rotation due to the phonon exchange mediated by the bosonic environment. We interpret the arising coupling as a phonon-induced spin-orbit coupling, which is quantified by the correlation function between the external and internal angular momentum operators. The same observation in the regime of strong impurity-bath coupling is elaborated within the Pekar approach. The correlation function shows a kink at a critical coupling, which is explained by a sharp transition between the ground state of the system and the states maximizing the interaction with surroundings. This result is of particular interest for the related fields involving the phenomena induced by spin-orbit interaction, such as spintronics and topological insulators.

[1] E. Yakaboylu, et al., Physical Review B 98, 224506 (2018)