Proximity Effect Transfer from NbTi into a Semiconductor Heterostructure via Epitaxial Aluminum

التفاصيل البيبلوغرافية
العنوان: Proximity Effect Transfer from NbTi into a Semiconductor Heterostructure via Epitaxial Aluminum
المؤلفون: Henri J. Suominen, Asbjorn Drachmann, Fabrizio Nichele, Borzoyeh Shojaei, Morten Kjaergaard, Charles Marcus, Chris Palmstrom
المصدر: Nano Letters
سنة النشر: 2016
مصطلحات موضوعية: Josephson effect, Materials science, Quantum point contact, FOS: Physical sciences, Bioengineering, 02 engineering and technology, 01 natural sciences, Superconductivity (cond-mat.supr-con), Condensed Matter::Superconductivity, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Proximity effect (superconductivity), General Materials Science, 010306 general physics, Quantum tunnelling, Superconductivity, Condensed matter physics, Condensed Matter - Mesoscale and Nanoscale Physics, business.industry, Mechanical Engineering, Condensed Matter - Superconductivity, Heterojunction, Niobium-titanium, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Semiconductor, 0210 nano-technology, business
الوصف: We demonstrate the transfer of the superconducting properties of NbTi---a large-gap high-critical-field superconductor---into an InAs heterostructure via a thin intermediate layer of epitaxial Al. Two device geometries, a Josephson junction and a gate-defined quantum point contact, are used to characterize interface transparency and the two-step proximity effect. In the Josephson junction, multiple Andreev reflection reveal near-unity transparency, with an induced gap $\Delta^*=0.50~\mathrm{meV}$ and a critical temperature of $7.8~\mathrm{K}$. Tunneling spectroscopy yields a hard induced gap in the InAs adjacent to the superconductor of $\Delta^*=0.43~\mathrm{meV}$ with substructure characteristic of both Al and NbTi.
اللغة: English
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::284a1b0a184941cbc4f03a3b478855f4
http://arxiv.org/abs/1611.10166
Rights: OPEN
رقم الانضمام: edsair.doi.dedup.....284a1b0a184941cbc4f03a3b478855f4
قاعدة البيانات: OpenAIRE