Practical Guide to Quantum Phase Transitions in Quantum-Dot-Based Tunable Josephson Junctions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10396378" target="_blank" >RIV/00216208:11320/19:10396378 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=6SXDF.0aet" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=6SXDF.0aet</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevApplied.11.044094" target="_blank" >10.1103/PhysRevApplied.11.044094</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Practical Guide to Quantum Phase Transitions in Quantum-Dot-Based Tunable Josephson Junctions

Popis výsledku v původním jazyce

Quantum dots attached to BCS superconducting leads exhibit a 0-π impurity quantum phase transition, which can be experimentally controlled either by the gate voltage or by the superconducting phase difference. For the pertinent superconducting single-impurity Anderson model, we present two simple analytical formulae describing the position of the phase boundary in parameter space for the weakly correlated and Kondo regime, respectively. Furthermore, we show that the two-level approximation provides an excellent description of the low-temperature physics of superconducting quantum dots near the phase transition. We discuss reliability and mutual agreement of available finite-temperature numerical methods (numerical renormalization group and quantum Monte Carlo) and suggest an alternative approach for efficient determination of the quantum phase boundary from measured finite-temperature data. Our results enable fast and efficient, yet reliable characterization and design of such nanoscopic tunable Josephson-junction devices. (C) 2019 American Physical Society.

Název v anglickém jazyce

Practical Guide to Quantum Phase Transitions in Quantum-Dot-Based Tunable Josephson Junctions

Popis výsledku anglicky

Quantum dots attached to BCS superconducting leads exhibit a 0-π impurity quantum phase transition, which can be experimentally controlled either by the gate voltage or by the superconducting phase difference. For the pertinent superconducting single-impurity Anderson model, we present two simple analytical formulae describing the position of the phase boundary in parameter space for the weakly correlated and Kondo regime, respectively. Furthermore, we show that the two-level approximation provides an excellent description of the low-temperature physics of superconducting quantum dots near the phase transition. We discuss reliability and mutual agreement of available finite-temperature numerical methods (numerical renormalization group and quantum Monte Carlo) and suggest an alternative approach for efficient determination of the quantum phase boundary from measured finite-temperature data. Our results enable fast and efficient, yet reliable characterization and design of such nanoscopic tunable Josephson-junction devices. (C) 2019 American Physical Society.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/GA16-19640S" target="_blank" >GA16-19640S: Vibrační efekty v nerovnovážném elektronovém transportu přes nanosystémy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review Applied

ISSN

2331-7019

e-ISSN

—

Svazek periodika

11

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

044094

Kód UT WoS článku

000466447500003

EID výsledku v databázi Scopus

2-s2.0-85065490521