Bulletin of the American Physical Society
APS March Meeting 2021
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session M20: Electrons, Phonons, Electron-Phonon Scattering, and Phononics V
11:30 AM–2:30 PM,
Wednesday, March 17, 2021
Sponsoring Units: DCOMP DMP
Chair: David Parker, Oak Ridge National Lab
Abstract: M20.00011 : Oxidation states, Thouless' pumps, and nontrivial transport in nonstoichiometric electrolytes*
1:54 PM–2:06 PM
We show that the topological requirements that allow these conditions to be broken are the same that would determine a Thouless' pump mechanism if the system were subject to a suitably defined time-periodic Hamiltonian. This determines a nontrivial transport regime whereby charge can flow without any ionic convection, even in electronic insulators.
We demonstrate these results on simple molecular models displaying a quantum-pump mechanism; then, we examine nonstoichiometric alkali-halide melts, where the nontrivial transport regime is such that most of the total charge current is uncorrelated from the ionic ones .
 FG and SB, Nat. Phys. 15, 967-972 (2019)
 PP, FG and SB, PRX (in press), arXiv:2006.16749 (2020)
*This work is supported by the EU through the MaX Centre of Excellence (grant #824143) and by the Italian MIUR through the PRIN 2017 FERMAT grant.
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