Exotic phenomena in doped quantum magnets

TL;DR

This paper explores how doping in a frustrated quantum antiferromagnet leads to exotic phenomena like spinon deconfinement, quantum disordered phases, and potential superconductivity, revealing a complex interplay of magnetic and electronic properties.

Contribution

It demonstrates the emergence of a quantum disordered phase and deconfined spinons in doped frustrated magnets, suggesting proximity to a deconfined critical point and possible superconductivity.

Findings

Doping destroys antiferromagnetic order and stabilizes a valence bond crystalline phase.

Doped holes liberate spinons with intermediate confinement behavior.

Extended spinon-holon bound states with small quasiparticle weight are observed.

Abstract

We investigate the properties of the two-dimensional frustrated quantum antiferromagnet on the square lattice, especially at infinitesimal doping. We find that next nearest neighbor (N.N.) J2 and next-next N.N. J3 interactions together destroy the antiferromagnetic long range order and stabilize a quantum disordered valence bond crystalline plaquette phase. A static vacancy or a dynamic hole doped into this phase liberates a spinon. From the profile of the spinon wavefunction around the (static) vacancy we identify an intermediate behavior between complete deconfinement (behavior seen in the kagome lattice) and strong confinement (behavior seen in the checkerboard lattice) with the emergence of two length scales, a spinon confinement length larger than the magnetic correlation length. When a finite hole hopping is introduced, this behavior translates into an extended (mobile) spinon-holon boundstate with a very small quasiparticle weight. These features provide clear evidence for a nearby "deconfined critical point" in a doped microscopic model. Finally, we give arguments in favor of superconducting properties of the doped plaquette phase.