Comment on "Absence versus Presence of Dissipative Quantum Phase Transition in Josephson Junctions''
Fuente:
arXiv
Salvato in:
| Autori principali: | , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2022
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866909481075474432 |
|---|---|
| author | Sépulcre, Théo Florens, Serge Snyman, Izak |
| author_facet | Sépulcre, Théo Florens, Serge Snyman, Izak |
| contents | In a recent Letter [Phys. Rev. Lett. 129, 087001, (2022)], Masuki, Sudo, Oshikawa, and Ashida studied a Josephson junction, with Josephson energy $E_{\rm J}$ and charging energy $E_{\rm C}$, shunted by an ohmic transmission line with conductance $α(2e)^2/h$. Their model includes a realistic high frequency cutoff of order $αE_c$, that is typically smaller than the plasma frequency $W$. The authors present a phase diagram showing surprising features, not anticipated in the established literature [eg. Schön and Zaikin, Phys. Reports 198, 237, (1990)]. For $E_{\rm J}/E_{\rm C}$ above a certain value, they find that the junction remains superconducting for all $α$, while below this value, they find that the insulating phase leads to re-entrant superconductivity at small $α$. In this Comment, we show that their Numerical Renormalization Group (NRG) implementation is uncontrolled, and that there is no evidence for the re-entrant superconductivity in the phase diagram presented in Fig. 1a of PRL 129, 087001. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2210_00742 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Comment on "Absence versus Presence of Dissipative Quantum Phase Transition in Josephson Junctions'' Sépulcre, Théo Florens, Serge Snyman, Izak Superconductivity Mesoscale and Nanoscale Physics In a recent Letter [Phys. Rev. Lett. 129, 087001, (2022)], Masuki, Sudo, Oshikawa, and Ashida studied a Josephson junction, with Josephson energy $E_{\rm J}$ and charging energy $E_{\rm C}$, shunted by an ohmic transmission line with conductance $α(2e)^2/h$. Their model includes a realistic high frequency cutoff of order $αE_c$, that is typically smaller than the plasma frequency $W$. The authors present a phase diagram showing surprising features, not anticipated in the established literature [eg. Schön and Zaikin, Phys. Reports 198, 237, (1990)]. For $E_{\rm J}/E_{\rm C}$ above a certain value, they find that the junction remains superconducting for all $α$, while below this value, they find that the insulating phase leads to re-entrant superconductivity at small $α$. In this Comment, we show that their Numerical Renormalization Group (NRG) implementation is uncontrolled, and that there is no evidence for the re-entrant superconductivity in the phase diagram presented in Fig. 1a of PRL 129, 087001. |
| title | Comment on "Absence versus Presence of Dissipative Quantum Phase Transition in Josephson Junctions'' |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2210.00742 |