Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 11: Focus Session: Single Particle Sources for Electronic Devices II
(Joint session of HL and TT organized by HL)

TT 11.8: Vortrag

Montag, 7. März 2016, 17:45–18:00, H10

Exact duality for open system time-evolution and surprises in the heat current relaxation of an interacting quantum dot — •Roman Saptsov^1,2, Jens Schulenborg³, Federica Haupt⁴, Janine Splettstoesser³, and Maarten Wegewijs^1,2,5 — ¹Institute for Theory of Statistical Physics, RWTH Aachen University, Aachen, Germany — ²JARA - FIT — ³Chalmers University of Thechnology, Götenborg, Sweden — ⁴JARA Institute for Quantum Information, RWTH Aachen, Aachen, Germany — ⁵Peter Grünberg Institut, FZ-Jülich, Jülich, Germany

Recent progress in nanoelectronics has brought the experimental detection and manipulation of few-electron heat currents in nanodevices within reach. However, a straightforward theoretical calculation of the heat-current relaxation – already for the simplest model of an Anderson quantum dot – exhibits a surprising behavior. More precisely, the contribution to the heat-current relaxation arising from the decay of the repulsive Coulomb interaction energy exhibits signatures of electron-electron attraction, and is governed by an interaction-independent decay rate [1]. The surprising behavior of the interaction-induced dissipation mode can only be understood with the help of a new duality relating the nonunitary evolution of an open quantum system to that of dual model with inverted energies [1]. Deriving from the fermion-parity superselection postulate, this duality applies to a large class of open systems, allowing for new general insights beyond the quantum-dot heat-current problem presented here.
J.Schulenborg, R. B. Saptsov, F. Haupt, J. Splettstoesser,

M.R. Wegewijs, arXiv: 1508.06145