Superconductivity
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Control of Disorder and Superconductivity in TiN films
Superconducting titanium nitride thin films are used in many quantum applications due to their large kinetic inductance. Here we prepared thin films using DC reactive magnetron sputtering at room temperature, with an RF bias applied to the substrate to systematically control film growth. By adjusting the substrate RF bias, the degree and length scale of…
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Electron and photon induced selenium migration in single crystal 2H-NbSe2
Transition metal dichalcogenides like 2H-NbSe₂ exhibit remarkable electronic properties, but their performance is highly sensitive to defects, particularly selenium vacancies. Here, we demonstrate controlled migration of Se atoms from the bulk to the surface of NbSe₂ single crystal, induced by heat, electron beam irradiation, and laser excitation. Using Raman spectroscopy, atomic force microscopy, and energy-dispersive…