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Title: Scanning tunneling shot-noise spectroscopy in Kondo systems

Abstract

Using a large- N theory in combination with the Keldysh nonequilibrium Green's function formalism, we investigate the current, differential conductance, zero-frequency shot noise, and Fano factor as measured by scanning tunneling shot-noise spectroscopy (STSNS) using a scanning tunneling microscope (STM) near single Kondo impurities and in Kondo lattices. We show that the Fano factor F exhibits a characteristic bias dependence arising from Kondo screening that is similar to the Kondo resonance observed in the differential conductance. Moreover, the line shape of F is strongly dependent on the ratio of the tunneling amplitudes for electron tunneling from the STM tip into the conduction band and electronic levels of the magnetic adatoms. We demonstrate that the Fano factor can be enhanced or suppressed due to interference effects and as such, is not only a sensitive probe for the correlation effects arising from Kondo screening, but also for quantum interference between tunneling electrons. We identify a correlation between the form of the differential conductance and the Fano factor that could be tested in future STSNS experiments.

Authors:
 [1]; ORCiD logo [1]
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  1. Univ. of Illinois, Chicago, IL (United States)
Publication Date:
Research Org.:
Univ. of Illinois, Chicago, IL (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1618191
Alternate Identifier(s):
OSTI ID: 1563012; OSTI ID: 1609690
Grant/Contract Number:  
FG02-05ER46225
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 12; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Adsorption; Kondo effect; Noise; Nonequilibrium Green's function; Scanning tunneling spectroscopy; Materials Science; Physics

Citation Formats

Cocklin, Sagen, and Morr, Dirk K. Scanning tunneling shot-noise spectroscopy in Kondo systems. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.125146.
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Cocklin, Sagen, & Morr, Dirk K. Scanning tunneling shot-noise spectroscopy in Kondo systems. United States. https://doi.org/10.1103/PhysRevB.100.125146
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Cocklin, Sagen, and Morr, Dirk K. Fri . "Scanning tunneling shot-noise spectroscopy in Kondo systems". United States. https://doi.org/10.1103/PhysRevB.100.125146. https://www.osti.gov/servlets/purl/1618191.
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@article{osti_1618191,
title = {Scanning tunneling shot-noise spectroscopy in Kondo systems},
author = {Cocklin, Sagen and Morr, Dirk K.},
abstractNote = {Using a large-N theory in combination with the Keldysh nonequilibrium Green's function formalism, we investigate the current, differential conductance, zero-frequency shot noise, and Fano factor as measured by scanning tunneling shot-noise spectroscopy (STSNS) using a scanning tunneling microscope (STM) near single Kondo impurities and in Kondo lattices. We show that the Fano factor F exhibits a characteristic bias dependence arising from Kondo screening that is similar to the Kondo resonance observed in the differential conductance. Moreover, the line shape of F is strongly dependent on the ratio of the tunneling amplitudes for electron tunneling from the STM tip into the conduction band and electronic levels of the magnetic adatoms. We demonstrate that the Fano factor can be enhanced or suppressed due to interference effects and as such, is not only a sensitive probe for the correlation effects arising from Kondo screening, but also for quantum interference between tunneling electrons. We identify a correlation between the form of the differential conductance and the Fano factor that could be tested in future STSNS experiments.},
doi = {10.1103/PhysRevB.100.125146},
journal = {Physical Review. B},
number = 12,
volume = 100,
place = {United States},
year = {Fri Sep 20 00:00:00 EDT 2019},
month = {Fri Sep 20 00:00:00 EDT 2019}
}
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https://doi.org/10.1103/PhysRevB.100.125146
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