Entropy Measurement of a Strongly Coupled Quantum Dot

Timothy Child^{1

2}, Owen Sheekey^{1

2}, Silvia Lüscher^{1

2}, Saeed Fallahi^{3

4}, Geoffrey C Gardner^{4

5}, Michael Manfra^{3

4

5

6}, Andrew Mitchell^{7

8}, Eran Sela⁹, Yaakov Kleeorin¹⁰, Yigal Meir^{11

12}, Joshua Folk^{1

2}

Affiliations

¹ Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia, V6T1Z4, Canada.
² Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, V6T1Z1, Canada.
³ Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.
⁴ Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA.
⁵ School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
⁶ Elmore Family School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
⁷ School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.
⁸ Centre for Quantum Engineering, Science, and Technology, University College Dublin, Dublin 4, Ireland.
⁹ Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, IL-69978 Tel Aviv, Israel.
¹⁰ Center for the Physics of Evolving Systems, University of Chicago, Chicago, Illinois 60637, USA.
¹¹ Department of Physics, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.
¹² The Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.

PMID: 36493429
DOI: 10.1103/PhysRevLett.129.227702

Entropy Measurement of a Strongly Coupled Quantum Dot

Timothy Child et al. Phys Rev Lett. 2022.

. 2022 Nov 23;129(22):227702.

doi: 10.1103/PhysRevLett.129.227702.

Authors

Affiliations

¹ Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia, V6T1Z4, Canada.
² Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, V6T1Z1, Canada.
³ Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.
⁴ Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA.
⁵ School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
⁶ Elmore Family School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
⁷ School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.
⁸ Centre for Quantum Engineering, Science, and Technology, University College Dublin, Dublin 4, Ireland.
⁹ Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, IL-69978 Tel Aviv, Israel.
¹⁰ Center for the Physics of Evolving Systems, University of Chicago, Chicago, Illinois 60637, USA.
¹¹ Department of Physics, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.
¹² The Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.

PMID: 36493429
DOI: 10.1103/PhysRevLett.129.227702

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.

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Entropy Measurement of a Strongly Coupled Quantum Dot

Affiliations

Entropy Measurement of a Strongly Coupled Quantum Dot

Authors

Affiliations

Abstract

MeSH terms

LinkOut - more resources

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