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Multiterminal Inverse AC Josephson Effect

Journal Article · · Nano Letters
 [1];  [2];  [3];  [2];  [4];  [4];  [5];  [5];  [6];  [4];  [2]
  1. Duke Univ., Durham, NC (United States); Duke University
  2. Duke Univ., Durham, NC (United States)
  3. Duke Univ., Durham, NC (United States); Wentworth Inst. of Technology, Boston, MA (United States)
  4. Appalachian State Univ., Boone, NC (United States)
  5. Advanced Materials Lab., NIMS, Tsukuba (Japan)
  6. City Univ. of Hong Kong, Kowloon (Hong Kong); Texas A & M Univ., College Station, TX (United States)
When a Josephson junction is exposed to microwave radiation, it undergoes the inverse AC Josephson effect–the phase of the junction locks to the drive frequency. As a result, the I–V curves of the junction acquire “Shapiro steps” of quantized voltage. If the junction has three or more superconducting contacts, coupling between different pairs of terminals must be taken into account and the state of the junction evolves in a phase space of higher dimensionality. Here, we study the multiterminal inverse AC Josephson effect in a graphene sample with three superconducting terminals. We observe robust fractional Shapiro steps and correlated switching events, which can only be explained by considering the device as a completely connected Josephson network. We successfully simulate the observed behaviors using a modified two-dimensional RCSJ model. Our results suggest that multiterminal Josephson junctions are a playground to study highly connected nonlinear networks with novel topologies.
Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0002765
OSTI ID:
1846860
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 22 Vol. 21; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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