Absence versus Presence of Dissipative Quantum Phase Transition in Josephson Junctions
| Autor: | Kanta Masuki, Hiroyuki Sudo, Masaki Oshikawa, Yuto Ashida |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Superconductivity (cond-mat.supr-con)
Quantum Physics Statistical Mechanics (cond-mat.stat-mech) Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter::Superconductivity Condensed Matter - Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) FOS: Physical sciences General Physics and Astronomy Quantum Physics (quant-ph) Condensed Matter - Statistical Mechanics |
| Zdroj: | Physical Review Letters. 129 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | Dissipative quantum phase transition has been widely believed to occur in a Josephson junction coupled to a resistor despite a lack of concrete experimental evidence. Here, on the basis of both numerical and analytical nonperturbative renormalization group (RG) analyses, we reveal breakdown of previous perturbative arguments and defy the common wisdom that the transition always occurs at the quantum resistance $R_{Q} \!=\! h/(4e^2)$. We find that RG flows in nonperturbative regimes induce nonmonotonic renormalization of the charging energy and lead to a qualitatively different phase diagram, where the insulator phase is strongly suppressed to the deep charge regime (Cooper pair box), while the system is always superconducting in the transmon regime. We identify a previously overlooked dangerously irrelevant term as an origin of the failure of conventional understandings. Our predictions can be tested in recent experiments realizing high-impedance long superconducting waveguides and would provide a solution to the long-standing controversy about the fate of dissipative quantum phase transition in the resistively shunted Josephson junction. 6+12 pages, 4+6 figures, to appear in PRL |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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