Holes as Dipoles in a Doped Antiferromagnet and Stripe Instabilities

Abstract

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.

arXiv comment11 pages, 5 figures, revised version with reference updates, to appear in Phys. Rev. B

References in corpus (9)

• Theory of Underdoped Cuprates
• Phase String Effect in the t-J Model: General Theory
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• Two-Hole Ground State: Dichotomy in Pairing Symmetry
• Spin-roton excitations in the cuprate superconductors
• Compass Impurity Model of Tb Substitution in Sr2IrO4
• Self-localization of holes in a lightly doped Mott insulator
• Real-space observation of charge ordering in epitaxial La2-xSrxCuO4 films
• Emergence of Topological Fermi Liquid from a Strongly Correlated Bosonic System in Optical Superlattices