Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Spin-Dependent Phenomena in 2D

MA 3.3: Vortrag

Montag, 5. September 2022, 10:00–10:15, H43

Spinon induced drag in quantum spin liquid heterostructures — •Raffaele Mazzilli¹, Alex Levchenko², and Elio Koenig¹ — ¹Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany — ²Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA

Several quantum spin liquid candidate materials, such as αRuCl₃ and 1T-TaSe₂, are exfoliable, so that it is possible to investigate 2D samples which avoid the manifestation of bulk properties that might disrupt the quantum spin liquid phase. In this phase the material is a Mott insulator and therefore it is impenetrable to direct electric probes such as charge currents. Despite this, in this work we propose an experimental setup that will allow to use non-local electrical probes to gain information on the transport properties of a gapless quantum spin liquid. The proposed setup is a spinon induced drag experiment, that consists in interfacing two metallic films separated by a layer of a quantum spin liquid. A current is injected in one of the two layers (active layer) and a voltage is measured on the second (passive) metallic film. The overall momentum transfer mechanism is a two-step process mediated by the Kondo interaction between the local moments in the quantum spin liquid and the spins of the electrons. We calculate, both for a U(1) and a Z₂ spin liquids, the drag resistivity in the framework of the linearized quantum Boltzmann equation derived from the Keldysh formalism. In this framework the three layers are out of thermodynamic equilibrium. We further confront the results obtained with the equilibrium case and with the results of standard Coulomb drag.