Show simple item record

dc.contributor Manucharyan, Vladimir E
dc.contributor Digital Repository at the University of Maryland
dc.contributor University of Maryland (College Park, Md.)
dc.contributor Physics
dc.creator Pankratova, Natalia
dc.date 2021-07-07T05:39:31Z
dc.date 2021-07-07T05:39:31Z
dc.date 2021
dc.date.accessioned 2022-05-20T08:38:38Z
dc.date.available 2022-05-20T08:38:38Z
dc.identifier https://doi.org/10.13016/cyj6-jngw
dc.identifier http://hdl.handle.net/1903/27258
dc.identifier.uri http://localhost:8080/xmlui/handle/CUHPOERS/117640
dc.description Conventionally, a Josephson junction is an ubiquitous quantum device formed by a weak link between a pair of superconductors. In this work, we demonstrate the dc Josephson effect in mesoscopic junctions of more than two superconducting terminals. We report fabrication and characterization of the 3- and 4-terminal Josephson junctions built in a top-down fashion from hybrid semiconductor-superconductor InAs/Al epitaxial heterostructures. In general, the critical current of an N-terminal junction is an (N-1)-dimensional hypersurface in the space of bias currents, which can be reduced to a set of critical current contours (CCCs). The CCC is a key ground state characteristic of a multi-terminal Josephson junction, which is readily available from regular electron transport measurements. We investigate nontrivial modifications of the CCC's geometry in response to electrical gating, magnetic field, and phase bias. All observed effects are described by the scattering formulation of the Josephson effect generalized to the case of N>2. Our observations indicate superconducting phase coherence between all the terminals which establishes the Josephson effect in mesoscopic junctions of more than two superconductors. Such multi-terminal junctions could find their applications in a broad range of fields from topologically protected quantum computation to quantum metrology and others.
dc.format application/pdf
dc.language en
dc.subject Quantum physics
dc.subject Condensed matter physics
dc.subject Josephson
dc.subject junction
dc.subject multi-ABS
dc.subject multi-SQUID
dc.subject multi-terminal
dc.subject topological
dc.title Multi-terminal Josephson effect
dc.type Dissertation


Files in this item

Files Size Format View
Pankratova_umd_0117E_21398.pdf 78.36Mb application/pdf View/Open

This item appears in the following Collection(s)

Show simple item record

Search DSpace


Advanced Search

Browse