Regular Article

Spin dynamics in lattices of spinor atoms with quadratic Zeeman effect

¹ Bogolubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141980, Russia
² Instituto de Fisica de São Carlos, Universidade de São Paulo, CP 369, São Carlos 13560-970, São Paulo, Brazil
³ Laboratory of Information Technologies, Joint Institute for Nuclear Research, Dubna 141980, Russia

^a e-mail: yukalov@theor.jinr.ru

Received: 10 July 2018
Published online: 1 November 2018

Abstract

A lattice system of spinor atoms or molecules experiencing quadratic Zeeman effect is considered. This can be an optical lattice with sufficiently deep wells at lattice sites, so that the system is in an isolating state, where atoms are well localized. But their effective spins can move in the presence of external magnetic fields. The dynamics of spins, starting from an initial nonequilibrium state, is investigated. The system is immersed into a magnetic coil of an electric circuit, creating a magnetic feedback field. Two types of quadratic Zeeman effect are treated, a nonresonant, so-called static-current quadratic Zeeman effect and a quasi-resonant alternating-current quadratic Zeeman effect. Spin dynamics in these conditions is highly nonlinear. Different regimes of spin dynamics, starting from a strongly nonequilibrium state, are studied. Conditions for realizing fast spin reversal are found, which can be used in quantum information processing and spintronics.