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h/e Superconducting Quantum Interference through Trivial Edge States in InAs
Folkert K de Vries1, Tom Timmerman1, Viacheslav P Ostroukh2
1QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Physical Review Letters
|February 14, 2018
Summary
Researchers investigated trivial edge states in indium arsenide (InAs) Josephson junctions. They observed superconducting quantum interference device (SQUID) patterns and a unique h/e SQUID signal, indicating crossed Andreev states in nontopological systems.
Area of Science:
- Condensed Matter Physics
- Quantum Information Science
Background:
- Josephson junctions in strong spin-orbit semiconductors are crucial for topological quantum systems.
- Nontopological edge states can coexist with topological states, complicating their study.
Purpose of the Study:
- To investigate the characteristics of trivial edge states in nontopological indium arsenide (InAs) Josephson junctions.
- To understand the origin of observed superconducting quantum interference patterns.
Main Methods:
- Fabrication of InAs Josephson junctions with strong spin-orbit coupling.
- Superconducting quantum interference measurements to probe edge transport phenomena.
Main Results:
- Observation of a clear superconducting quantum interference device (SQUID) pattern, confirming edge transport.
- Detection of a distinct h/e SQUID signal, distinct from the typical 2e-flux quantum.
Conclusions:
- The observed h/e SQUID signal originates from crossed Andreev states within the nontopological InAs Josephson junctions.
- This study provides insights into the behavior of trivial edge states and their unique superconducting signatures.
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