Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Quantum Dots and Point Contacts (joint session TT/HL)

TT 78.7: Vortrag

Donnerstag, 12. März 2026, 12:30–12:45, HSZ/0101

Readout of multi-level quantum geometry from electronic transport — •Raffael L. Klees and Mónica Benito — Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany

The quantum geometric tensor (QGT) of a quantum system in a given parameter space captures both the geometry of the state manifold and the topology of the system [1]. While the local QGT elements have been successfully measured in various platforms, the challenge of detecting them in electronic transport systems − such as tunnel or molecular junctions − has yet to be resolved. To fill this gap, we propose a measurement protocol based on weak and resonant parameter modulations [2], and theoretically demonstrate how the local QGT in such systems can be directly probed from changes of the tunnel conductance [3]. This approach enables the measurement of both geometrical and topological features of quantum states in a broad class of transport-based quantum systems.
[1] M. Kolodrubetz et al., Phys. Rep. 697, 1 (2017)
[2] T. Ozawa and N. Goldman, Phys. Rev. B 97, 201117(R) (2018)
[3] R. L. Klees and M. Benito, arXiv:2508.08239 (2025)

Keywords: quantum geometric tensor; electronic transport; geometry and topology of quantum systems; nonequilibrium quantum systems; driven quantum systems