Stripe phase ordering as quantum interference phenomenon

TL;DR

This paper proposes a quantum interference mechanism for stripe phase instability in quasi-1D electron systems, linking microscopic spin-charge interactions to observed lattice structures in complex oxides.

Contribution

It introduces a new quantum interference perspective on stripe phase formation and derives the spin-charge coupling term microscopically.

Findings

Periodic lattice potential induces cooperative spin and charge superlattice condensation.

Renormalization group analysis supports the Hartree-Fock picture.

The mechanism explains stripe structures in lanthanum cuprates and nickelates.

Abstract

A quantum interference mechanism of the stripe phase instability in quasi one-dimensional (1D) repulsive electron system is proposed. The leading spin-charge coupling term in Landau functional is derived microscopically. It is shown that away from half filling, periodic lattice potential causes cooperative condensation of the spin and charge superlattices, which constitute a 1D analogue of the experimentally observed quasi 2D structures in lanthanum cuprates and nickelates. Renormalization group analysis qualitatively supports the Hartree-Fock picture.