Towards A Possible Charge-Kondo effect in Optical Lattices

TL;DR

This paper explores the potential realization of the charge Kondo liquid in optical lattices by tuning interactions, highlighting its transient nature and analogies with nuclear matter.

Contribution

It proposes a method to induce the charge Kondo liquid in optical lattices using Feshbach resonances and laser pulses, and analyzes its stability conditions.

Findings

CKL appears only when ordered ground states are destabilized.

CKL is never a stable ground state.

Analogies with nuclear matter are discussed.

Abstract

The Kondo effect underpins a large body of recent developments in the physics of $d$- and $f$-band compounds. Although its {\it charge} analog is a rarity in solids, the recent observations of the charge Kondo effect and the consequent rise in superconducting T$_c$ encourage a search for other accessible systems. Motivated by the possibility of wilfully tuning the {\it sign} of the inter-electronic interaction in optical lattices, we study conditions for the elusive {\it charge Kondo liquid} (CKL) state to manifest. We propose that a combination of Feshbach resonances and sequentially controlled laser pulses may produce the CKL. We show that the CKL is {\it never} a stable ground state, appearing only when the ordered ground states are destabilized. Finally, we discuss interesting analogies with nuclear matter.