Localization of isolated holes in a Mott insulator and delocalization by pairing

Kumar, N. (1990) Localization of isolated holes in a Mott insulator and delocalization by pairing Physical Review B, 42 (10). pp. 6138-6141. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v42/i10/p6138_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.42.6138

Abstract

I have calculated the ground-state energy and wave function of a single (pair of) hole(s) moving in a two-dimensional antiferromagnetically correlated background in the self-retracing-path approximation within the t-J model. The confining potential due to the string of overturned spins is treated quasistatically in the strong-coupling limit. I find that (i) an isolated hole is autolocalized at discrete energy levels, broadened presumably into narrow resonances due to failure of the quasistatic approximation, (ii) a pair of holes bind for J/t>0.45 in the dilute limit δ→0, but (iii) higher concentration favors delocalization of holes by pairing. This has observable consequences for the normal-state transport and optical absorption in the high-Tc cuprate superconductors.

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ID Code:18378
Deposited On:17 Nov 2010 09:20
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