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MON: Monday Contributed Sessions

MON 23: Poster Session: Fundamental Aspects and Model Systems

MON 23.44: Poster

Monday, September 8, 2025, 18:30–20:30, ZHG Foyer 1. OG

Minimal quantum models and non-standard heat transport — Helen Dorausch and •Carsten Henkel — Universität Potsdam, Institut für Physik und Astronomie

As the building blocks of coupled thermodynamical systems get smaller, quantum physics introduces curious challenges. We study simple examples based on oscillators coupled to heat baths. (1) A single, strongly damped oscillator driven by a laser provides a model for the plasmon resonance of a single particle. We study it with a quantum jump simulation that provides a quite different steady-state picture with strong spikes in the local bath temperature (the electron gas in the particle itself). (2) A two-site oscillator chain connected to baths with different temperatures permits to dis-spell a purported violation of the second law [1, 2]. We analyse carefully the role of the rotating-wave approximation adopted in the coupling (or not). The symplectic (canonical) group Sp(4) is instrumental in getting a global picture.

[1] A. Levy and R. Kosloff, Europhys. Lett. 107 (2014) 20004

[2] C. Henkel, Ann. Phys. (Berlin) 533 (2021) 2100089

Keywords: anomalous heat transport; canonical transformation; quantum jump simulation