Infinite single-particle bandwidth of a Mott-Hubbard insulator

Freericks, JK and Cohn, JR and van Dongen, PGJ and Krishnamurthy, HR (2016) Infinite single-particle bandwidth of a Mott-Hubbard insulator. In: International Conference on Electron Correlation in Nanostructures (ECN), SEP 03-06, 2015, Odessa, UKRAINE.

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Abstract

The conventional viewpoint of the strongly correlated electron metal-insulator transition is that a single band splits into two upper and lower Hubbard bands at the transition. Much work has investigated whether this transition is continuous or discontinuous. Here we focus on another aspect and ask the question of whether there are additional upper and lower Hubbard bands, which stretch all the way out to infinity - leading to an infinite single-particle bandwidth (or spectral range) for the Mott insulator. While we are not able to provide a rigorous proof of this result, we use exact diagonalization studies on small clusters to motivate the existence of these additional bands, and we discuss some different methods that might be utilized to provide such a proof. Even though the extra upper and lower Hubbard bands have very low total spectral weight, those states are expected to have extremely long lifetimes, leading to a nontrivial contribution to the transport density of states for dc transport and modifying the high temperature limit for the electrical resistivity.

Item Type:	Conference Proceedings
Publication:	INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Publisher:	WORLD SCIENTIFIC PUBL CO PTE LTD
Additional Information:	Copy right for this article belongs to the WORLD SCIENTIFIC PUBL CO PTE LTD, 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE
Keywords:	Mott-Hubbard insulator; Hubbard model; density of states
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	25 Aug 2016 10:14
Last Modified:	25 Aug 2016 10:14
URI:	http://eprints.iisc.ac.in/id/eprint/54336

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