Entropy of a double quantum dot
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912912472276992 |
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| author | Kealhofer, David Adam, Christoph Ruckriegel, Max J. Tomić, Petar Kratochwil, Benedikt Reichl, Christian Meir, Yigal Wegscheider, Werner Ihn, Thomas Ensslin, Klaus |
| author_facet | Kealhofer, David Adam, Christoph Ruckriegel, Max J. Tomić, Petar Kratochwil, Benedikt Reichl, Christian Meir, Yigal Wegscheider, Werner Ihn, Thomas Ensslin, Klaus |
| contents | We use charge sensing to detect entropy changes in a double quantum dot defined by electrostatic gating of a GaAs/AlGaAs heterostructure. This system can be tuned to be two separate systems, like two independent, artificial atoms, or a single coherent system, like a molecule. We study entropy changes in both regimes due to changes in the occupation of the system. First we recover the single-dot result for each dot, that the occupation of the dot by a single electron corresponds to an increase in the entropy of $k_{\mathrm{B}} \log 2$. Next we examine two different charge transitions in the "molecular" regime, and how it reveals itself in terms of the measured entropy. We also uncover a realization of Pauli blockade that clutters the entropy signal. By applying a rate equation model, we demonstrate the effect's nonequilibrium origins and exclude it from the analysis of the system's entropy. Understanding these experiments in this simplest coupled system enables the study of the entropy in other, more complicated coupled quantum systems, such as ones with topological or highly entangled ground states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_09481 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Entropy of a double quantum dot Kealhofer, David Adam, Christoph Ruckriegel, Max J. Tomić, Petar Kratochwil, Benedikt Reichl, Christian Meir, Yigal Wegscheider, Werner Ihn, Thomas Ensslin, Klaus Mesoscale and Nanoscale Physics We use charge sensing to detect entropy changes in a double quantum dot defined by electrostatic gating of a GaAs/AlGaAs heterostructure. This system can be tuned to be two separate systems, like two independent, artificial atoms, or a single coherent system, like a molecule. We study entropy changes in both regimes due to changes in the occupation of the system. First we recover the single-dot result for each dot, that the occupation of the dot by a single electron corresponds to an increase in the entropy of $k_{\mathrm{B}} \log 2$. Next we examine two different charge transitions in the "molecular" regime, and how it reveals itself in terms of the measured entropy. We also uncover a realization of Pauli blockade that clutters the entropy signal. By applying a rate equation model, we demonstrate the effect's nonequilibrium origins and exclude it from the analysis of the system's entropy. Understanding these experiments in this simplest coupled system enables the study of the entropy in other, more complicated coupled quantum systems, such as ones with topological or highly entangled ground states. |
| title | Entropy of a double quantum dot |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2508.09481 |