Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W15: Superconductivity in One and Two Dimensions III
3:00 PM–5:00 PM,
Thursday, March 7, 2024
Room: M100F
Sponsoring
Unit:
DCMP
Chair: Gang Qui
Abstract: W15.00003 : Kondo impurity in one dimensional O(3)-invariant Superconductor
3:24 PM–3:36 PM
Presenter:
Pradip Kattel
(Rutgers University)
Authors:
Pradip Kattel
(Rutgers University)
Natan Andrei
(Rutgers University, New Brunswick)
We study a variant of this problem but has an interacting bath and discover using the Bethe-Ansatz that the model is richer with several more phases. For an antiferromagnetic impurity coupling, apart from the usual Kondo screening, there exists a new kind of phase where the impurity is screened by a single particle bound mode formed at the impurity site. Surprisingly, even when the coupling is ferromagnetic, the impurity can be screened – however, this screening occurs not at the ground state but in the high energy excited states.
Using the density matrix renormalization group, we compute various local observables. These behave differently in the various phases[JP2] . We show the implication of the single-particle bound mode in local measurable quantities, in unitary time evolution, and in non-local quantities like the entanglement entropy.
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