Scanning tunneling shot-noise spectroscopy in Kondo systems

Cocklin, Sagen; Morr, Dirk K.

doi:10.1103/PhysRevB.100.125146

Title: Scanning tunneling shot-noise spectroscopy in Kondo systems

Journal Article · 20 September 2019 · Physical Review. B

DOI: https://doi.org/10.1103/PhysRevB.100.125146 · OSTI ID:1618191

Cocklin, Sagen ^[1];

^[1]

Univ. of Illinois, Chicago, IL (United States)

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.

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Research Organization:: Univ. of Illinois, Chicago, IL (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46225

OSTI ID:: 1618191

Alternate ID(s):: OSTI ID: 1563012; OSTI ID: 1609690

Journal Information:: Physical Review. B, Vol. 100, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Title: Scanning tunneling shot-noise spectroscopy in Kondo systems

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