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Article: Frequency-dependent transport properties in disordered systems: A generalized coherent potential approximation approach

TitleFrequency-dependent transport properties in disordered systems: A generalized coherent potential approximation approach
Authors
Issue Date2019
PublisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/
Citation
Physical Review B: covering condensed matter and materials physics, 2019, v. 99 n. 15, article no. 155406 , p. 1-10 How to Cite?
AbstractTo predict transport properties of disordered systems, especially ac transport properties, one has to calculate the disorder average of the correlation of the multiple Green's function at different energies. To avoid brute force calculation, diagrammatic perturbation expansion must be used along with the coherent potential approximation (CPA). In this paper, we develop a theoretical formalism based on the nonequilibrium Green's function that maps the average of the correlation of the multiple Green's function into an average over a single generalized Green's function. After the mapping, this formalism is structurally very similar to the CPA and completely eliminates the need to perform diagrammatic expansion. As a demonstration of our theory, the dynamic conductance, frequency-dependent shot noise under dc bias, and frequency-dependent noise spectrum under ac bias in the presence of Anderson disorder are calculated by directly taking the disorder average of the generating function of full counting statistics (FCS) within the CPA. Our numerical results on dynamic conductance, frequency-dependent shot noise under dc bias, and frequency-dependent noise spectrum under ac bias show remarkable agreement with that obtained by the brute force calculation. The phase diagram in the frequency versus disorder strength plane has been efficiently calculated using the generalized FCS-CPA method.
Persistent Identifierhttp://hdl.handle.net/10722/270092
ISSN
2017 Impact Factor: 3.813
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhang, L-
dc.contributor.authorFu, B-
dc.contributor.authorWang, B-
dc.contributor.authorWei, YD-
dc.contributor.authorWang, J-
dc.date.accessioned2019-05-20T05:09:25Z-
dc.date.available2019-05-20T05:09:25Z-
dc.date.issued2019-
dc.identifier.citationPhysical Review B: covering condensed matter and materials physics, 2019, v. 99 n. 15, article no. 155406 , p. 1-10-
dc.identifier.issn2469-9950-
dc.identifier.urihttp://hdl.handle.net/10722/270092-
dc.description.abstractTo predict transport properties of disordered systems, especially ac transport properties, one has to calculate the disorder average of the correlation of the multiple Green's function at different energies. To avoid brute force calculation, diagrammatic perturbation expansion must be used along with the coherent potential approximation (CPA). In this paper, we develop a theoretical formalism based on the nonequilibrium Green's function that maps the average of the correlation of the multiple Green's function into an average over a single generalized Green's function. After the mapping, this formalism is structurally very similar to the CPA and completely eliminates the need to perform diagrammatic expansion. As a demonstration of our theory, the dynamic conductance, frequency-dependent shot noise under dc bias, and frequency-dependent noise spectrum under ac bias in the presence of Anderson disorder are calculated by directly taking the disorder average of the generating function of full counting statistics (FCS) within the CPA. Our numerical results on dynamic conductance, frequency-dependent shot noise under dc bias, and frequency-dependent noise spectrum under ac bias show remarkable agreement with that obtained by the brute force calculation. The phase diagram in the frequency versus disorder strength plane has been efficiently calculated using the generalized FCS-CPA method.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/-
dc.relation.ispartofPhysical Review B: covering condensed matter and materials physics-
dc.rightsCopyright 2019 by The American Physical Society. This article is available online at https://dx.doi.org/10.1103/PhysRevB.99.155406-
dc.titleFrequency-dependent transport properties in disordered systems: A generalized coherent potential approximation approach-
dc.typeArticle-
dc.identifier.emailWang, J: jianwang@hku.hk-
dc.identifier.authorityWang, J=rp00799-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.99.155406-
dc.identifier.scopuseid_2-s2.0-85064122303-
dc.identifier.hkuros297670-
dc.identifier.volume99-
dc.identifier.issue15-
dc.identifier.spagearticle no. 155406, p. 1-
dc.identifier.epagearticle no. 155406, p. 10-
dc.identifier.isiWOS:000463885000002-
dc.publisher.placeUnited States-

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