Universality and scaling in a charge two-channel Kondo device

A. K. Mitchell, L. A. Landau, L. Fritz, E. Sela

Research output: Contribution to journalArticlepeer-review

Abstract

We study a charge two-channel Kondo model, demonstrating that recent experiments [Z. Iftikhar et al, Nature (London) 526, 233 (2015)] realize an essentially perfect quantum simulation - not just of its universal physics, but also nonuniversal effects away from the scaling limit. Numerical renormalization group (RG) calculations yield conductance line shapes encoding RG flow to a critical point involving a free Majorana fermion. By mimicking the experimental protocol, the experimental curve is reproduced quantitatively over 9 orders of magnitude, although we show that far greater bandwidth/temperature separation is required to obtain the universal result. Fermi liquid instabilities are also studied: In particular, our exact analytic results for nonlinear conductance provide predictions away from thermal equilibrium, in the regime of existing experiments.

Original languageEnglish
Article number157202
JournalPhysical Review Letters
Volume116
Issue number15
DOIs
StatePublished - 13 Apr 2016

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