Holes as Dipoles in a Doped Antiferromagnet and Stripe Instabilities

Details Holes as Dipoles in a Doped Antiferromagnet and Stripe Instabilities Holes as Dipoles in a Doped Antiferromagnet and Stripe Instabilities

2002-12-06

arxiv.org/abs/cond-mat/0212134v2

Phys. Rev. B67, 115103 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 5 figures, revised version with reference updates, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.115103

Based on an effective model of a doped antiferromagnetic Mott insulator, we show that a doped hole will induce a dipole-like spin configuration in a spin ordered phase at low doping. The kinetic energy of doped holes is severely frustrated and a hole-dipole object is actually localized or self-trapped in space. Without a balance from the kinetic energy, the long-range dipole-dipole interaction between doped holes will dominate the low-energy physics, leading to an inhomogeneity instability as hole-dipoles collapse into stripes. Both antiphase metallic stripes of quarter-filling and antiphase insulating stripes along a diagonal direction are discussed as composed of hole-dipoles as elementary building blocks. Stripe melting and competing phases are also discussed.

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