Li Induced Spin and Charge Excitations in a Spin Ladder

Details Li Induced Spin and Charge Excitations in a Spin Ladder Li Induced Spin and Charge Excitations in a Spin Ladder

Publishing date

2001-08-06

URL

arxiv.org/abs/cond-mat/0108099v1

Journals

Phys. Rev. Lett. 88, 257201 (2002)

Science

Physics

Field

Condensed Matter

SubField

Strongly Correlated Electrons

Additional info

4 pages, Submitted to Physical Review Letters

Type

Scientific paper

Digital Object Identifier

10.1103/PhysRevLett.88.257201

Abstract

A lithium dopant in a cuprate spin ladder acts as a vacant (non-magnetic) site accompanied by an extra hole bound by a Coulomb potential. We find that, although the undoped ladder spin gap is not essentially altered by Li doping, a dopant-magnon bound state appears within the gap. Contrary to the case of Zn-doped ladders, we predict that, in the Li-doped ladder, the spin liquid character is very robust against antiferromagnetism. We also predict the spatial dependence of the density of states in the vicinity of the dopant which could be measured by local spectroscopic probes.

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