Development of a Nb-based semiconductor-superconductor hybrid 2DEG platform
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00644978" target="_blank" >RIV/68378271:_____/25:00644978 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0374815" target="_blank" >https://hdl.handle.net/11104/0374815</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/aelm.202400687" target="_blank" >10.1002/aelm.202400687</a>
Alternative languages
Result language
angličtina
Original language name
Development of a Nb-based semiconductor-superconductor hybrid 2DEG platform
Original language description
Semiconductor-superconductor hybrid materials are used as a platform torealize Andreev bound states, which hold great promise for quantumapplications. These states require transparent interfaces between thesemiconductor and superconductor, which are typically realized by in-situdeposition of an Al superconducting layer. Here a hybrid material ispresented, based on an InAs 2D electron gas (2DEG) combined with in-situdeposited Nb and NbTi superconductors, which offer a larger operating rangein temperature and magnetic field due to their larger superconducting gap.The inherent difficulty associated with the formation of an amorphousinterface between III-V semiconductors and Nb-based superconductors isaddressed by introducing a 7 nm Al interlayer. The Al interlayer provides anepitaxial connection between an in-situ magnetron sputtered Nb or NbTi thinfilm and a shallow InAs 2DEG. This metal-to-metal epitaxy is achieved byoptimization of the material stack and results in an induced superconductinggap of approximately 1 meV, determined from transport measurements ofsuperconductor-semiconductor Josephson junctions. This induced gap isapproximately five times larger than the values reported for Al-based hybridmaterials and indicates the formation of highly-transparent interfaces that arerequired in high-quality hybrid material platforms.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Advanced Electronic Materials
ISSN
2199-160X
e-ISSN
2199-160X
Volume of the periodical
11
Issue of the periodical within the volume
7
Country of publishing house
DE - GERMANY
Number of pages
12
Pages from-to
2400687
UT code for WoS article
001396664700001
EID of the result in the Scopus database
2-s2.0-85215127580