TY - JOUR
T1 - Entropy Measurement of a Strongly Coupled Quantum Dot
AU - Child, Timothy
AU - Sheekey, Owen
AU - Lüscher, Silvia
AU - Fallahi, Saeed
AU - Gardner, Geoffrey C.
AU - Manfra, Michael
AU - Mitchell, Andrew
AU - Sela, Eran
AU - Kleeorin, Yaakov
AU - Meir, Yigal
AU - Folk, Joshua
N1 - Funding Information:
This project has received funding from European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 951541. Y. M. acknowledges discussions with A. Georges and support by the Israel Science Foundation (Grant No. 3523/2020). Experiments at UBC were undertaken with support from the Stewart Blusson Quantum Matter Institute, the Natural Sciences and Engineering Research Council of Canada, the Canada Foundation for Innovation, the Canadian Institute for Advanced Research, and the Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program. S. F., G. C. G., and M. M. were supported by the US DOE Office of Basic Energy Sciences, Division of Materials Sciences and Engineering award DE-SC0006671 and QIS award DE-SC0020138. A. K. M. acknowledges funding from the Irish Research Council Laureate Awards 2017/2018 through Grant No. IRCLA/2017/169.
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/11/23
Y1 - 2022/11/23
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85143386357&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.129.227702
DO - 10.1103/PhysRevLett.129.227702
M3 - Article
C2 - 36493429
AN - SCOPUS:85143386357
SN - 0031-9007
VL - 129
JO - Physical Review Letters
JF - Physical Review Letters
IS - 22
M1 - 227702
ER -