Phase-dependent supercurrent and microwave dissipation of HgTe quantum well Josephson junctions
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929759966986240 |
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| author | Liu, Wei Piatrusha, Stanislau U. Fürst, Lena Lunczer, Lukas Borzenko, Tatiana Stehno, Martin P. Molenkamp, Laurens W. |
| author_facet | Liu, Wei Piatrusha, Stanislau U. Fürst, Lena Lunczer, Lukas Borzenko, Tatiana Stehno, Martin P. Molenkamp, Laurens W. |
| contents | We measured the microwave response of a HgTe quantum well Josephson junction embedded into an RF SQUID loop which is inductively coupled to a superconducting resonator. The side-contacted devices studied here operate in bulk transport mode, with a separation between the superconducting contacts smaller than both the estimated carrier mean free path and superconducting coherence length. We extract the current-phase relation and the phase-dependent microwave dissipation, that, at low temperature, primarily is related to photon-induced transitions between the Andreev bound states. We study the effects of gate voltage and temperature on our devices and compare the measurements with a tight-binding model based on the Bogoliubov-de Gennes equations. A combined analysis of both microwave admittance components allows us to confirm the presence of a small gap in the Andreev bound state spectrum at phase $π$, indicating high interface transparency, matching our observations in DC measurements of a similar device. Our work demonstrates the versatility of microwave measurements as a tool for Josephson junction characterization and highlights the importance of the interface properties for side-contacted Josephson devices. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_17550 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Phase-dependent supercurrent and microwave dissipation of HgTe quantum well Josephson junctions Liu, Wei Piatrusha, Stanislau U. Fürst, Lena Lunczer, Lukas Borzenko, Tatiana Stehno, Martin P. Molenkamp, Laurens W. Superconductivity Mesoscale and Nanoscale Physics We measured the microwave response of a HgTe quantum well Josephson junction embedded into an RF SQUID loop which is inductively coupled to a superconducting resonator. The side-contacted devices studied here operate in bulk transport mode, with a separation between the superconducting contacts smaller than both the estimated carrier mean free path and superconducting coherence length. We extract the current-phase relation and the phase-dependent microwave dissipation, that, at low temperature, primarily is related to photon-induced transitions between the Andreev bound states. We study the effects of gate voltage and temperature on our devices and compare the measurements with a tight-binding model based on the Bogoliubov-de Gennes equations. A combined analysis of both microwave admittance components allows us to confirm the presence of a small gap in the Andreev bound state spectrum at phase $π$, indicating high interface transparency, matching our observations in DC measurements of a similar device. Our work demonstrates the versatility of microwave measurements as a tool for Josephson junction characterization and highlights the importance of the interface properties for side-contacted Josephson devices. |
| title | Phase-dependent supercurrent and microwave dissipation of HgTe quantum well Josephson junctions |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2412.17550 |