Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Quantum Transport and Quantum Hall effects (joint session HL/TT)
TT 58.3: Vortrag
Mittwoch, 11. März 2026, 15:30–15:45, POT/0006
Phase-coherent autonomous nonequilibrium demon — •José Balduque1,2 and Rafael Sánchez1,2,3 — 1Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain. — 2Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain — 3Instituto Nicolás Cabrera (INC), Universidad Autónoma de Madrid, Madrid, Spain.
Mesoscopic conductors enable the efficient management and useful conversion of not only thermal resources but also nonequilibrium electron distributions. The latter scenario makes it possible to define demonic modes of operation, in which the entropy of a subsystem is autonomously reduced without extracting net particles or energy from the subsystem that provides the nonequilibrium resource [1]. We propose an implementation of such a nonequilibrium demon, or N-demon, in a multiterminal system that exploits carrier coherence. This is achieved by directly coupling the demonic subsystem to an isothermal two-terminal conductor via a scanning tip, enabling the local injection of electrons in a nonthermal distribution that participates in the phase-coherent interference processes governing the system's transport response [2]. In this way, we uncover an extrinsic, nonlocal, and phase-tunable transport response induced by the demon [3].
[1] R. Sánchez, et al., Phys. Rev. Lett. 123, 216801 (2019).
[2] R. Sánchez, et al., Phys. Rev. B, 105, 239903 (2022).
[3] J. Balduque and R. Sánchez, in preparation.
Keywords: Quantum transport; Quantum thermodynamics; Mesoscopics; Maxwell demon; Heat engine