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TT: Fachverband Tiefe Temperaturen
TT 73: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 2
TT 73.4: Vortrag
Donnerstag, 23. März 2017, 15:45–16:00, HSZ 304
Transport dynamics in a quenched tunnel-coupled Luttinger liquid — •Filippo M. Gambetta1, Fabio Cavaliere1, Maura Sassetti1, Alessio Calzona1,2, Roberta Citro3, and Matteo Carrega4 — 1Università di Genova and SPIN-CNR, Genova, Italy — 2University of Luxembourg, Luxembourg — 3Università di Salerno and SPIN-CNR, Fisciano (SA), Italy — 4NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Pisa, Italy
The transport dynamics of a quenched Luttinger liquid tunnel-coupled to a fermionic non-interacting probe is investigated. In the transient dynamics, we show that for a sudden quench of the electron interaction universal power-law decay in time of the tunneling current occurs, ascribed to the presence of entangled compound excitations created by the quench. In sharp contrast to the usual nonuniversal power-law behavior of a zero-temperature nonquenched Luttinger liquid, the steady-state tunneling current is Ohmic and can be explained in terms of an effective quench-activated heating of the system. Furthermore, by studying the fractionalization of charge and energy injected through the tunneling junction, we demonstrate that in the steady state the charge fractionalization ratio is unaffected by the pre-quenched parameters. On the contrary, due to the post-quench non-equilibrium spectral function, the energy partitioning ratio is strongly modified, reaching values even larger than one. This is a peculiar feature of the non-equilibrium dynamics of the quench process and it is in sharp contrast with the non-quenched case, where the ratio is bounded by one.