Entropy Measurement of a Strongly Coupled Quantum Dot

Timothy Child, Owen Sheekey, Silvia Lüscher, Saeed Fallahi, Geoffrey C. Gardner, Michael Manfra, Andrew Mitchell, Eran Sela, Yaakov Kleeorin, Yigal Meir, Joshua Folk

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The spin 1/2 entropy of electrons trapped in a quantum dot has previously been measured with great accuracy, but the protocol used for that measurement is valid only within a restrictive set of conditions. Here, we demonstrate a novel entropy measurement protocol that is universal for arbitrary mesoscopic circuits and apply this new approach to measure the entropy of a quantum dot hybridized with a reservoir. The experimental results match closely to numerical renormalization group (NRG) calculations for small and intermediate coupling. For the largest couplings investigated in this Letter, NRG calculations predict a suppression of spin entropy at the charge transition due to the formation of a Kondo singlet, but that suppression is not observed in the experiment.

Original languageEnglish
Article number227702
JournalPhysical Review Letters
Volume129
Issue number22
DOIs
StatePublished - 23 Nov 2022

ASJC Scopus subject areas

  • General Physics and Astronomy

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