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Angle-Resolved Photoemission Spectroscopy of the Insulating $Na_xWO_3$: Anderson Localization, Polaron Formation, and Remnant Fermi Surface

Raj, S and Hashimoto, D and Matsui, H and Souma, S and Sato, T and Takahashi, T and Sarma, DD and Mahadevan, Priya and Oishi, S (2006) Angle-Resolved Photoemission Spectroscopy of the Insulating $Na_xWO_3$: Anderson Localization, Polaron Formation, and Remnant Fermi Surface. In: Physical Review Letters, 96 (14). 147603-1-147603-4.

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Abstract

The electronic structure of the insulating sodium tungsten bronze, $Na_0_._0_2_5WO_3$, is investigated by high-resolution angle-resolved photoemission spectroscopy. We find that near$-E_F$ states are localized due to the strong disorder arising from random distribution of $Na^+$ ions in the $WO_3$ lattice, which makes the system insulating. The temperature dependence of photoemission spectra provides direct evidence for polaron formation. The remnant Fermi surface of the insulator is found to be the replica of the real Fermi surface in the metallic system.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 16 May 2006
Last Modified: 19 Sep 2010 04:26
URI: http://eprints.iisc.ernet.in/id/eprint/6682

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