Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G29: Strongly Correlated Systems, Including Quantum Fluids and Solids V
11:30 AM–2:30 PM,
Tuesday, March 7, 2023
Room: Room 221
Sponsoring
Unit:
DCMP
Chair: Sanu Mishra, Los alamos National Lab
Abstract: G29.00002 : Spin Fractionalization in a Kondo Lattice Heterostructure
11:42 AM–11:54 AM
Presenter:
Ethan J Huecker
(University of Cincinnati)
Authors:
Ethan J Huecker
(University of Cincinnati)
Yashar Komijani
(University Of Cincinnati)
To shed more light on the phenomena of spin fractionalization, we study the dynamical spin susceptibility in a Kondo lattice using strong Kondo coupling expansion which reduces the problem to the solution of a multi-particle Schrodinger equation. The spin excitations can be described as a simultaneous formation of a pair of spin-1/2 doublon and a spin-1/2 holon, with some residual attractive interaction between the two that naturally leads to the formation of a bound-state.
The computed susceptibility exhibits a sharp spin-1 para-magnon excitation at low energies and a continuum of excitations into fractionalized spinons at higher energies. We show that spin fractionalization can be achieved by placing the Kondo lattice in proximity to a superconductor, where the condensate of Cooper pairs within the superconductor can tunnel into/out of the Kondo lattice, transforming holons and doublons into one another, and lowering the energy of the fractionalized regime compared to the magnon bound states. We present a long-wavelength continuum model description that enables us to generalize our result to two-dimensional systems, applicable to epitaxially grown Kondo heterostructure. Such fractionalization can in principle be detected using neutron scattering.
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