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Scanning Tunneling Spectroscopy with Superconducting Junctions

Publications associées (50)

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Quick and Clean: Stencil Lithography for Wafer-Scale Fabrication of Superconducting Tunnel Junctions

Jürgen Brugger, Andreea Veronica Savu

Abstract—This paper presents a resist-less process for parallel fabrication of sub-micrometer Al-AlOx-Al superconducting tunnel junctions. A custom stencil is fabricated containing 200 nm low stress SiN membranes with micro-apertures. The stencil is aligne ...

2009

The discovery of high temperature superconductivity in the cuprates in 1986 has boosted the research in strongly correlated materials. One strong motivation was and stays the understanding the high-Tc phenomenon with the hope that one can ultimately engine ...

EPFL2008

Quick and Clean: Stencil Lithography for Wafer-Scale Fabrication of Superconducting Tunnel Junctions

Jürgen Brugger, Andreea Veronica Savu

This paper presents a resist-less process for parallel fabrication of sub-micrometer Al-AlOx-Al superconducting tunnel junctions. A custom stencil is fabricated containing 200 nm low-stress SiN membranes with micro-apertures. The stencil is aligned and cla ...

2008

We study a diffusive superconductor-ferromagnet-superconductor (SFS) junction with in-plane ferromagnetic domains. Close to the superconducting transition temperature, we describe the proximity effect in the junction with the linearized Usadel equations [P ...

2007

Diffusion engineering has been proposed as an approach to increase the collected charge and energy resolution of a single-photon superconducting tunnel junction (STJ) spectrometer. We present new experimental results confirming this approach. When a photon ...

2007

This thesis reports measurements at the single atom scale by using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Different sample systems where analyzed with normal conducting and superconducting tips. Chapter 2 presents the t ...

EPFL2006

Diffusion-engineered quasiparticle multiplication for STJ single photon detectors

Andreea Veronica Savu

We have designed a diffusion-engineered, singlephoton spectrometer in the optical-UV range using a superconducting tunnel junction. The optical photon is absorbed in a Ta film and creates excess quasiparticles. These trap into an Al tunnel junction. Intern ...

2005

We analyze the transport through a narrow ballistic superconductor–normal-metal–superconductor Josephson contact with nonideal transmission at the superconductor–normal-metal interfaces, e.g., due to insulating layers, effective mass steps, or band misfits ...

2001

We report on the ab-plane polarized reflectance of an untwinned (Bi1.57Pb0.43)Sr2CaCu2O8+delta single crystal over the frequency range from 80 to 32 000 cm(-1) (10 meV-4 eV) at temperatures between 10 and 300 K. We find a clear anisotropy in the ab-plane o ...

1999

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We report on angle-resolved photoemission and superconductor-insulator-superconductor tunneling measurements of the normal and superconducting states of Bi2Sr2CaCu2O8+x single crystal samples and Bi2Sr2CaCu2O8+x - native oxide- lead (S-I-S) tunnel junction ...

Aip Press1999