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Charge Transport in Hybrid Tunnel Superconductor—Quantum Dot—Superconductor Junctions
- Source :
- IEEE Transactions on Applied Superconductivity. 27:1-7
- Publication Year :
- 2017
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2017.
-
Abstract
- We have studied thin-film superconductor - semiconductor (with quantum dots)—superconductor MоRe–Si(W)—MoRe junctions, where electrons are tunneling through a single or several quantum dots within the Si(W) barrier. Current–voltage characteristics (CVCs) of the samples have been measured in a wide voltage range from –900 to 900 mV at temperatures from 4.2 to 8 K. At relatively high tungsten content in the barrier, we have observed emergence of the Josephson effect. Characteristic voltages I $_{c}$ R $_{N}$ , the product of the critical Josephson supercurrent I $_{c}$ and the normal-state resistance R $_{N}$ , of the samples were unusually high. Simultaneously, we have observed large excess quasiparticle currents I exc in the dissipative part of CVCs, which is a strong evidence of intensive electron-to-hole Andreev reflections in the junctions studied. When the W content in the barrier was decreased, the Josephson current disappeared, and we have observed resonant current peaks in the CVCs at bias voltages from 40 to 300 mV, which were symmetrical for positive and negative voltages. In the studied heterostructures, metal clusters inside the barrier behave as quasi-one-dimensional quantum dots; hence, the charge transport can be adequately described by scattering matrices within the quantum model of one-dimensional charge transport.
- Subjects :
- Josephson effect
Superconductivity
Materials science
Condensed matter physics
business.industry
02 engineering and technology
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Electronic, Optical and Magnetic Materials
Pi Josephson junction
Semiconductor
Quantum dot
Condensed Matter::Superconductivity
0103 physical sciences
Quasiparticle
Superconducting tunnel junction
Electrical and Electronic Engineering
010306 general physics
0210 nano-technology
business
Quantum tunnelling
Subjects
Details
- ISSN :
- 15582515 and 10518223
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Applied Superconductivity
- Accession number :
- edsair.doi...........39c06c12babcd43120ddb2f955425775