Reversal of particle-hole scattering-rate asymmetry in the Anderson impurity model

Zitko, R and Krishnamurthy, HR and Shastry, B Sriram (2018) Reversal of particle-hole scattering-rate asymmetry in the Anderson impurity model. In: PHYSICAL REVIEW B, 98 (16).

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Abstract

We study the particle-hole asymmetry of the scattering rate in strongly correlated electron systems by examining the cubic omega(3) and omega T-2 terms in the imaginary part of the self-energy of the Anderson impurity model. We show that the sign is opposite in the weak-coupling and strong-coupling limits, explaining the differences found in theoretical approaches taking the respective limits as the starting points. The sign change in fact precisely delineates the crossover between the weak- and strong-correlation regimes of the model. For weak interaction U the sign reversal occurs for small values of the doping delta = 1- n, while for interaction of order U approximate to 2 Gamma, Gamma being the hybridization strength, the crossover curve rapidly shifts to the large-doping range. This curve, based on the impurity dynamics, is genuinely different from other crossover curves defined through impurity thermodynamic and static properties.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW B
Publisher:	AMER PHYSICAL SOC
Additional Information:	Copy right for this article belong to AMER PHYSICAL SOC
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	22 Nov 2018 15:04
Last Modified:	22 Nov 2018 15:04
URI:	http://eprints.iisc.ac.in/id/eprint/61114

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