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Title: Recent progress of probing correlated electron states by point contact spectroscopy

Authors:
;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1297258
Grant/Contract Number:
AC0298CH1088
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Reports on Progress in Physics
Additional Journal Information:
Journal Volume: 79; Journal Issue: 9; Related Information: CHORUS Timestamp: 2016-09-13 03:17:37; Journal ID: ISSN 0034-4885
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Lee, Wei-Cheng, and Greene, Laura H. Recent progress of probing correlated electron states by point contact spectroscopy. United Kingdom: N. p., 2016. Web. doi:10.1088/0034-4885/79/9/094502.
Lee, Wei-Cheng, & Greene, Laura H. Recent progress of probing correlated electron states by point contact spectroscopy. United Kingdom. doi:10.1088/0034-4885/79/9/094502.
Lee, Wei-Cheng, and Greene, Laura H. 2016. "Recent progress of probing correlated electron states by point contact spectroscopy". United Kingdom. doi:10.1088/0034-4885/79/9/094502.
@article{osti_1297258,
title = {Recent progress of probing correlated electron states by point contact spectroscopy},
author = {Lee, Wei-Cheng and Greene, Laura H.},
abstractNote = {},
doi = {10.1088/0034-4885/79/9/094502},
journal = {Reports on Progress in Physics},
number = 9,
volume = 79,
place = {United Kingdom},
year = 2016,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/0034-4885/79/9/094502

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  • Here, we developed a microscopic theory for the point-contact conductance between a metallic electrode and a strongly correlated material using the nonequilibrium Schwinger-Kadanoff-Baym-Keldysh formalism. We explicitly show that, in the classical limit, contact size shorter than the scattering length of the system, the microscopic model can be reduced to an effective model with transfer matrix elements that conserve in-plane momentum. We found that the conductance dI/dV is proportional to the effective density of states, that is, the integrated single-particle spectral function A(ω = eV) over the whole Brillouin zone. From this conclusion, we are able to establish the conditions undermore » which a non-Fermi liquid metal exhibits a zero-bias peak in the conductance. Lastly, this finding is discussed in the context of recent point-contact spectroscopy on the iron pnictides and chalcogenides, which has exhibited a zero-bias conductance peak.« less
  • Here, we developed a microscopic theory for the point-contact conductance between a metallic electrode and a strongly correlated material using the nonequilibrium Schwinger-Kadanoff-Baym-Keldysh formalism. We explicitly show that, in the classical limit, contact size shorter than the scattering length of the system, the microscopic model can be reduced to an effective model with transfer matrix elements that conserve in-plane momentum. We found that the conductance dI/dV is proportional to the effective density of states, that is, the integrated single-particle spectral function A(ω = eV) over the whole Brillouin zone. From this conclusion, we are able to establish the conditions undermore » which a non-Fermi liquid metal exhibits a zero-bias peak in the conductance. Lastly, this finding is discussed in the context of recent point-contact spectroscopy on the iron pnictides and chalcogenides, which has exhibited a zero-bias conductance peak.« less
    Cited by 9
  • In this paper an overview is given of some recent issues and results concerning the single-particle electronic structure of strongly correlated electron systems. Specific topics include the {alpha} {minus} {gamma} transition in cerium metal, the Kondo resonance in Y{sub 1{minus}x}U{sub x}Pd{sub 3} and the insulator-to-metal transition in superconducting cuprates.