skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: High-resolution tunnel fluctuoscopy

Abstract

Electron tunneling spectroscopy pioneered by Esaki and Giaever offered a powerful tool for studying electronic spectra and density of states (DOS) in superconductors. This led to important discoveries that revealed, in particular, the pseudogap in the tunneling spectrum of superconductors above their critical temperatures. However, the phenomenological approach of Giaever and Megerle does not resolve the fine structure of low-bias behavior carrying significant information about electron scattering, interactions, and decoherence effects. Here we construct a complete microscopic theory of electron tunneling into a superconductor in the fluctuation regime. We reveal a non-trivial low-energy anomaly in tunneling conductivity due to Andreev-like reflections of injected electrons from superconducting fluctuations. Our findings enable real-time observation of fluctuating Cooper pairs dynamics by time-resolved scanning tunneling microscopy measurements and open new horizons for quantitative analysis of the fluctuation electronic spectra of superconductors.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1357765
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Europhysics Letters; Journal Volume: 107; Journal Issue: 4
Country of Publication:
United States
Language:
English

Citation Formats

Glatz, A., Varlamov, A. A., and Vinokur, V. M. High-resolution tunnel fluctuoscopy. United States: N. p., 2014. Web. doi:10.1209/0295-5075/107/47004.
Glatz, A., Varlamov, A. A., & Vinokur, V. M. High-resolution tunnel fluctuoscopy. United States. doi:10.1209/0295-5075/107/47004.
Glatz, A., Varlamov, A. A., and Vinokur, V. M. Fri . "High-resolution tunnel fluctuoscopy". United States. doi:10.1209/0295-5075/107/47004.
@article{osti_1357765,
title = {High-resolution tunnel fluctuoscopy},
author = {Glatz, A. and Varlamov, A. A. and Vinokur, V. M.},
abstractNote = {Electron tunneling spectroscopy pioneered by Esaki and Giaever offered a powerful tool for studying electronic spectra and density of states (DOS) in superconductors. This led to important discoveries that revealed, in particular, the pseudogap in the tunneling spectrum of superconductors above their critical temperatures. However, the phenomenological approach of Giaever and Megerle does not resolve the fine structure of low-bias behavior carrying significant information about electron scattering, interactions, and decoherence effects. Here we construct a complete microscopic theory of electron tunneling into a superconductor in the fluctuation regime. We reveal a non-trivial low-energy anomaly in tunneling conductivity due to Andreev-like reflections of injected electrons from superconducting fluctuations. Our findings enable real-time observation of fluctuating Cooper pairs dynamics by time-resolved scanning tunneling microscopy measurements and open new horizons for quantitative analysis of the fluctuation electronic spectra of superconductors.},
doi = {10.1209/0295-5075/107/47004},
journal = {Europhysics Letters},
number = 4,
volume = 107,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}