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JSPEC SIGNED

Josephson Junction Spectroscopy of Mesoscopic Systems

Total Cost €

0

EC-Contrib. €

0

Partnership

0

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 JSPEC project word cloud

Explore the words cloud of the JSPEC project. It provides you a very rough idea of what is the project "JSPEC" about.

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Project "JSPEC" data sheet

The following table provides information about the project.

Coordinator
COLLEGE DE FRANCE 

Organization address
address: PLACE MARCELIN BERTHELOT 11
city: PARIS
postcode: 75005
website: www.college-de-france.fr

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country France [FR]
 Project website http://phi0.org
 Total cost 1˙997˙497 €
 EC max contribution 1˙997˙497 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2014-STG
 Funding Scheme ERC-STG
 Starting year 2015
 Duration (year-month-day) from 2015-04-01   to  2020-03-31

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    COLLEGE DE FRANCE FR (PARIS) coordinator 1˙997˙497.00

Map

 Project objective

Spectroscopy is a powerful tool to probe matter. By measuring the spectrum of elementary excitations, one reveals the symmetries and interactions inherent in a physical system. Mesoscopic devices, which preserve quantum coherence over lengths larger than the atomic scale, offer a unique possibility to both engineer and investigate excitations at the single quanta level. Unfortunately, conventional spectroscopy techniques are inadequate for coupling radiation to mesoscopic systems and detecting their small absorption signals. I propose an on-chip, Josephson-junction based spectrometer which surpasses state-of-the-art instruments and is ideally suited for probing elementary excitations in mesoscopic systems. It has an original design providing uniform wideband coupling from 2-2000 GHz, low background noise, high sensitivity, and narrow linewidth.

I describe the operating principle and design of the spectrometer, show preliminary results demonstrating proof-of-concept, and outline three experiments which exploit the spectrometer to address important issues in condensed matter physics. The experiments are: measuring the lifetime of single quasiparticle and excited Cooper pair states in superconductors, a topic relevant for quantum information processing; determining whether graphene has a bandgap, a fundamental yet unresolved question; and recording a clear spectroscopic signature of Majorana bound states in topological superconductor weak links.

Various applications of the superconducting circuits developed for the spectrometer include a Josephson vector network analyzer, a cryogenic mixer, a THz camera, a detector for radioastronomy, and a scanning microwave impedance microscope. In itself the proposed JJ spectrometer is a general purpose tool that will benefit researchers studying mesoscopic systems. Ultimately, Josephson junction spectroscopy should not only be useful to detect existing elementary excitations but also to discover new ones.

 Publications

year authors and title journal last update
List of publications.
2018 J. Griesmar
A mesoscopic spectrometer based on the Josephson effect
published pages: , ISSN: , DOI:
2019-11-07
2019 J.-D. Pillet, V. Benzoni, J. Griesmar, J.-L. Smirr, Ç. Ö. Girit
Nonlocal Josephson Effect in Andreev Molecules
published pages: 7138-7143, ISSN: 1530-6984, DOI: 10.1021/acs.nanolett.9b02686
Nano Letters 19/10 2019-11-07

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