Speaker: Masaya Nakagawa (Univ. Tokyo)

Date and time : Nov. 2nd, 17:00-

Style: Webinar with ZOOM

Title:Dissipative quantum many-body physics in ultracold atoms

Abstract: Since quantum systems are always surrounded by their environment, understanding of dissipation caused by an environment has been a central problem in quantum physics. Recently, the high controllability of quantum simulators using atoms, molecules, and ions has enabled us to introduce controllable dissipation in quantum many-body systems. Such dissipative systems undergo nonunitary quantum dynamics and provide an emerging new class of quantum many-body physics governed by non-Hermitian operators. In this talk, we discuss how dissipation fundamentally alters the quantum many-body physics in ultracold atoms on the basis of several paradigmatic models of strongly correlated systems. Specifically, we show an exotic circular renormalization-group flow in the Kondo effect [1], dissipation-induced reversal of magnetism [2], and an exact Bethe-ansatz solution of a one-dimensional dissipative Hubbard model [3].

[1] M. Nakagawa, N. Kawakami, and M. Ueda, Phys. Rev. Lett. 121, 203001 (2018).

[2] M. Nakagawa, N. Tsuji, N. Kawakami, and M. Ueda, Phys. Rev. Lett. 124, 147203 (2020).

[3] M. Nakagawa, N. Kawakami, and M. Ueda, arXiv:2003.14202.