Approaching multichannel Kondo physics using correlated bosons: Quantum phases and how to realize them

Siddhartha Lal, Sarang Gopalakrishnan, Paul M. Goldbart

Research output: Contribution to journalArticlepeer-review

Abstract

We discuss how multichannel Kondo physics can arise in the setting of a localized level coupled to several bosonic Tomonaga-Luttinger liquid leads. We propose one physical realization involving ultracold bosonic atoms coupled to an atomic quantum dot, and a second, based on superconducting nanowires coupled to a Cooper-pair box. The corresponding zero-temperature phase diagram is determined via an interplay between Kondo-type phenomena arising from the dot and the consequences of direct interlead hopping, which can destabilize the Kondo ground state, thus suppressing the Kondo effect. We demonstrate that the multichannel Kondo state is stable over a wide range of parameters. We establish the existence of two nontrivial phase transitions, involving a competition between Kondo screening at the dot and strong correlations either within or between the leads (which, respectively, promote local number and phase pinning). These transitions coalesce at a self-dual multicritical point.

Original languageEnglish (US)
Article number245314
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number24
DOIs
StatePublished - Jun 16 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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