التفاصيل البيبلوغرافية
| العنوان: |
Spectroscopy of $NbSe_2$ using Energy-Tunable Defect-Embedded Quantum Dots |
| المؤلفون: |
T. R. Devidas, Itai Keren, Hadar Steinberg |
| بيانات النشر: |
arXiv, 2021. |
| سنة النشر: |
2021 |
| مصطلحات موضوعية: |
Superconductivity, Materials science, Graphene, Mechanical Engineering, Condensed Matter - Superconductivity, FOS: Physical sciences, Bioengineering, Fermi energy, General Chemistry, Condensed Matter Physics, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Molecular physics, law.invention, Superconductivity (cond-mat.supr-con), Atomic orbital, Quantum dot, law, Condensed Matter::Superconductivity, Density of states, General Materials Science, Spectroscopy, Quantum tunnelling |
| الوصف: |
Quantum dots have sharply defined energy levels, which can be used for high resolution energy spectroscopy when integrated in tunneling circuitry. Here we report dot-assisted spectroscopy measurements of the superconductor $NbSe_2$, using a van der Waals device consisting of a vertical stack of $graphene-MoS_2-NbSe_2$. The $MoS_2$ tunnel barriers host naturally occurring defects which function as quantum dots, allowing transport via resonant tunneling. The dot energies are tuned by an electric field exerted by a back-gate, which penetrates the graphene source electrode. Scanning the dot potential across the superconductor Fermi energy, we reproduce the $NbSe_2$ density of states which exhibits a well-resolved two-gap spectrum. Surprisingly, we find that the dot-assisted current is dominated by the lower energy feature of the two $NbSe_2$ gaps, possibly due to a selection rule which favors coupling between the dots and the orbitals which exhibit this gap.
Comment: 22 pages, 6 figures |
| DOI: |
10.48550/arxiv.2106.03047 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f772759bf68d7b48f093f7beab6582b |
| Rights: |
OPEN |
| رقم الانضمام: |
edsair.doi.dedup.....7f772759bf68d7b48f093f7beab6582b |
| قاعدة البيانات: |
OpenAIRE |