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Phase dynamics in an AC-driven multiterminal Josephson junction analog

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [2];  [3]
  1. Appalachian State University, Boone, NC (United States); OSTI
  2. Appalachian State University, Boone, NC (United States)
  3. Appalachian State University, Boone, NC (United States); Duke Univ., Durham, NC (United States)
In the presence of an AC drive, multiterminal Josephson junctions exhibit the inverse AC Josephson effect, where the oscillations of the superconducting phase of each junction can lock onto one another or onto the external drive. The competition between these different phase-locked states results in a complex array of quantized voltage plateaus whose stability strongly depend on the circuit parameters of the shunted junctions. This phase diagram cannot be explored with low-temperature transport experiments alone, given the breadth of the parameter space, so we present an easily tunable analog circuit whose dynamical properties emulate those of a three-terminal junction. We focus on the observation of the multiterminal inverse AC Josephson effect, and we discuss how to identify Shapiro steps associated with each of the three junctions as well as their quartet states. We only observe integer phase-locked states in strongly overdamped networks, but fractional Shapiro steps appear as well when the quality factor of the junctions increases. Finally, we discuss the role of transverse coupling in the synchronization of the junctions.
Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0002765
OSTI ID:
2419647
Alternate ID(s):
OSTI ID: 1898167
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 106; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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