Electron conductance and many-body marker of a cavity-embedded topological one-dimensional chain - INSPIRE

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Electron conductance and many-body marker of a cavity-embedded topological one-dimensional chain

Feb 29, 2024

9 pages

Published in:

Phys.Rev.B 110 (2024) 19, 195416

Published: Nov 15, 2024

e-Print:

2402.19244 [cond-mat.mes-hall]

DOI:

10.1103/PhysRevB.110.195416 (publication)

View in:

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Abstract: (APS)

We investigate many-body topological and transport properties of a one-dimensional Su–Schrieffer–Heeger (SSH) topological chain coupled to the quantum field of a cavity mode. The quantum conductance is determined via Green's function formalism in terms of the light-matter eigenstates calculated via exact diagonalization for a finite number of electrons. We show that the topology of the cavity-embedded many-electron system is described by a generalized electron-photon Zak marker. We reveal how the quantization of transport is modified by the cavity vacuum fields for a finite-size chain and how it is impacted by electronic disorder. Moreover, we show that electron-photon entanglement produces dramatic differences with respect to the predictions of mean-field theory, which strongly underestimates cavity-modified transport.

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