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

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

Funding

FundersFunder number
Quantum Materials and Future Technologies Program
U.S. Department of Energy
Basic Energy Sciences
Canadian Institute for Advanced Research
Horizon 2020 Framework Programme951541
Division of Materials Sciences and EngineeringDE-SC0006671, DE-SC0020138
Natural Sciences and Engineering Research Council of Canada
Canada Foundation for Innovation
European Research Council
Irish Research CouncilIRCLA/2017/169
Israel Science Foundation3523/2020
Canada First Research Excellence Fund
Stewart Blusson Quantum Matter Institute, University of British Columbia

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