Boundary Resonances in S = 1/2 Antiferromagnetic Chains under a Staggered Field

Abstract

We develop a boundary field theory approach to electron spin resonance in open $S=1/2$ Heisenberg antiferromagnetic chains with an effective staggered field. In terms of the sine Gordon effective field theory with boundaries,we point out the existence of boundary bound states of elementary excitations, and modification of the selection rules at the boundary. We argue that several "unknown modes" found in electron spin resonance experiments on KCuGaF${}_6$ [I. Umegaki et al., Phys. Rev. B 79, 184401 (2009)] and Cu-PM [S. A. Zvyagin et al., Phys. Rev. Lett. 93, 027201 (2004)] can be understood as boundary resonances introduced by these effects.

References in corpus (4)

• Quantum criticality in an Ising chain: experimental evidence for emergent E8 symmetry
• Field-Induced Gap in a Quantum Spin-1/2 Chain in a Strong Magnetic Field
• Local density of states of 1D Mott insulators and CDW states with a boundary
• Dynamical response functions in the quantum Ising chain with a boundary

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• Dimensional modulation of spontaneous magnetic order in quasi-two-dimensional quantum antiferromagnets
• Dynamical properties of the sine-Gordon quantum spin magnet Cu-PM at zero and finite temperature
• Predicting Excitonic Gaps of Semiconducting Single Walled Carbon Nanotubes From a Field Theoretic Analysis
• Control of superexchange interactions with DC electric fields
• Temperature- and Size-dependence of Line shape of ESR spectra of XXZ antiferromagnetic chain
• Anisotropic Field-Induced Gap in Quasi-One-Dimensional Antiferromagnet KCuMoO${}_4$(OH)
• Anisotropy-induced soliton excitation in magnetized strong-rung spin ladders
• Field-induced dimer orders in quantum spin chains
• Quantized edge magnetizations and their symmetry protection in one-dimensional quantum spin systems