DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2024 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

DY: Fachverband Dynamik und Statistische Physik

DY 56: Many-body Quantum Dynamics II (joint session DY/TT)

DY 56.4: Talk

Friday, March 22, 2024, 10:00–10:15, A 151

Real-time transport of short electron pulses trough an impurity on a 1D quantum wire — •Thomas Kloss1,2, Yuriel Nunez Fernandez1,2, and Xavier Waintal21Univ. Grenoble Alpes, CNRS, Institut Néel, 38000 Grenoble, France — 2Université Grenoble Alpes, CEA, Grenoble INP, IRIG, Pheliqs, F-38000 Grenoble, France

We study the transmission of pulses which are propagating through a weakly coupled impurity site, which is located on an infinitely long 1D tight-binding chain. For short pulses, the number of transmitted charges deviates from the adiabatic regime and shows a periodic dependence on the number of injected charges. In the limit of ultrashort pulses an analytic formula can be derived which matches perfectly the results obtained by numerical simulations using the Tkwant software. In a next step, a Hubbard-like interaction with strength U is added on the impurity site. Onside density and currents are obtained in a perturbative expansion in U using a real-time Green function approach. We apply a tensor-train technique to integrate over the high-dimensional integrals, which has been shown to outperform diagrammatic quantum Monte Carlo by orders of magnitude in speed an accuracy. The results are compared to self-consistent mean-field calculations and to the non-interacting limit.

Keywords: Pulses; Impurity; Tensor train; interacting; real-time

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2024 > Berlin