Controlled Population of Floquet-Bloch States via Coupling to Bose and Fermi Baths

By K. Seetharam, C. Bardyn, N. Lindner, Mark Rudner, G. Refael. 2015

147 citations recorded by the source corpus.

External driving is emerging as a promising tool for exploring new phases in quantum systems. The intrinsically non-equilibrium states that result, however, are challenging to describe and control. We study the steady states of a periodically driven one-dimensional electronic system, including the effects of radiative recombination, electron-phonon interactions, and the coupling to an external fermionic reservoir. Using a kinetic equation for the populations of the Floquet eigenstates, we show that the steady-state distribution can be controlled using the momentum and energy relaxation pathways provided by the coupling to phonon and Fermi reservoirs. In order to utilize the latter, we propose to couple the system and reservoir via an energy filter which suppresses photon-assisted tunneling. Importantly, coupling to these reservoirs yields a steady state resembling a band insulator in the Floquet basis. The system exhibits incompressible behavior, while hosting a small density of excitations. We discuss transport signatures, and describe the regimes where insulating behavior is obtained. Our results give promise for realizing Floquet topological insulators.

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/a58c1855c842c3d9c1278e5a950dd97af6d7720d

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Colloquium: Nonthermal pathways to ultrafast control in quantum materials (2021, background): “tice can act as a ‘thermostat’ for the electronic system due to the large timescale separation between electronic and lattice dynamics, with early works suggesting routes towards the controlled dissipative population of singleparticle Floquet states (Dehghani et al., 2014; Iadecola et al., 2015; See”
Floquet topological transitions in a driven one-dimensional topological insulator (2015, background): “…[19–21] and theories are being developed to unveil the states’ ﬁngerprint of their topology [8,22–25], e.g., the bulk boundary correspondence [26–28], their dynamics [29,30], occupation [31,32], transport properties [33–36], and the connection between the Hall response and the edge states [37].”