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Exploring bound states of NbSe₂ van der Waals superconductor probed by tunneling spectroscopy

Mingazheva, Zarina. Exploring bound states of NbSe₂ van der Waals superconductor probed by tunneling spectroscopy. 2024, Doctoral Thesis, University of Basel, Faculty of Science.

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Official URL: https://edoc.unibas.ch/96702/

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Abstract

This thesis investigates the properties of the unconventional superconductor NbSe₂, focusing specifically on the origins of sub-gap excitations observed in NbSe₂-based van der Waals heterostructures. The work is structured as follows: following the introduction in Chapter 1, Chapter 2 provides the theoretical background of superconductors (SC), quantum dots (QD), and hybrid QD-SC devices, including the concept of forming Andreev bound states. Additionally, Chapter 2 covers tunneling spectroscopy techniques and the properties of van der Waals materials, specifically superconducting NbSe₂. Chapter 3 describes the fabrication processes of the devices and the experimental setup, detailing mechanical exfoliation, the dry stacking technique for forming heterostructures, and the electronics and cryogenic systems used for measurements. Chapter 4 explores the macroscopic properties of NbSe₂, such as the critical transition temperature and critical magnetic field values, and presents tunneling spectra data with fitting to investigate the nature of superconductivity in NbSe₂. Chapter 5 presents experimental results and a discussion of subgap states observed in NbSe₂-based tunnel junctions. Finally, Chapter 6 summarizes the thesis and suggests possible directions for future experiments.
Advisors:Schönenberger, Christian
Committee Members:Meyer, Ernst and Gröning, Oliver
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Meyer, Ernst
Item Type:Thesis
Thesis Subtype:Doctoral Thesis
Thesis no:15511
Thesis status:Complete
Number of Pages:iv, 82
Language:English
Identification Number:
  • urn: urn:nbn:ch:bel-bau-diss155115
edoc DOI:
Last Modified:16 Nov 2024 05:30
Deposited On:15 Nov 2024 15:01

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