From stripe to checkerboard order on the square lattice in the presence of quenched disorder
Phys. Rev. B 74, 024520 (2006) We discuss the effects of quenched disorder on a model of charge density wave (CDW) ordering on the square lattice. Our model may be applicable to the cuprate superconductors, where a random electrostatic potential exists in the CuO2 planes as a result of the presence...
Saved in:
Main Authors | , , |
---|---|
Format | Journal Article |
Language | English |
Published |
01.03.2006
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Phys. Rev. B 74, 024520 (2006) We discuss the effects of quenched disorder on a model of charge density wave
(CDW) ordering on the square lattice. Our model may be applicable to the
cuprate superconductors, where a random electrostatic potential exists in the
CuO2 planes as a result of the presence of charged dopants. We argue that the
presence of a random potential can affect the unidirectionality of the CDW
order, characterized by an Ising order parameter. Coupling to a unidirectional
CDW, the random potential can lead to the formation of domains with 90 degree
relative orientation, thus tending to restore the rotational symmetry of the
underlying lattice. We find that the correlation length of the Ising order can
be significantly larger than the CDW correlation length. For a checkerboard CDW
on the other hand, disorder generates spatial anisotropies on short length
scales and thus some degree of unidirectionality. We quantify these disorder
effects and suggest new techniques for analyzing the local density of states
(LDOS) data measured in scanning tunneling microscopy experiments. |
---|---|
DOI: | 10.48550/arxiv.cond-mat/0603029 |