Effects of anisotropic spin-exchange interactions in spin ladders

Abstract

We investigate the effects of the Dzialoshinskii-Moriya (DM) and Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interactions on various thermodynamic and magnetic properties of a spin 1/2 ladder. Using the Majorana fermion representation, we derive the spectrum of low energy excitations for a pure DM interaction and in presence of a superimposed KSEA interaction. We calculate the various correlation functions for both cases and discuss how they are modified with respect to the case of an isotropic ladder. We also discuss the electron spin resonance (ESR) spectrum of the system and show that it is strongly influenced by the orientation of the magnetic field with respect to the Dzialoshinskii-Moriya vector. Implications of our calculations for NMR and ESR experiments on ladder systems are discussed.

14 pages, 4 eps figures, corrected calculation of NMR rate (v3)

References in corpus (2)

• Finite-temperature dynamical magnetic susceptibility of quasi-one-dimensional frustrated spin-1/2 Heisenberg antiferromagnets
• Strong anisotropy of superexchange in the copper-oxygen chains of La_{14-x}Ca_{x}Cu_{24}O_{41}

Cited by in corpus (10)

• Defects in correlated metals and superconductors
• Vortex lattice melting in a boson-ladder in artificial gauge field
• Anisotropy of Magnetic Interactions in the Spin-Ladder Compound (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$
• Quantum phase transitions of a two-leg bosonic ladder in an artificial gauge field
• Intrinsic decoherence effects on correlated coherence and quantum discord in XXZ Heisenberg model
• The unusual electronic structure of the "pseudo-ladder" compound CaCu2O3
• Magnetic response and quantum critical behavior in the doped two-leg extended Hubbard ladder
• Spin-orbit coupled fermions in ladder-like optical lattices at half-filling
• The effects of KSEA interaction on the ground-state properties of spin chains in a transverse field
• Exact solution and magnetic properties of an anisotropic spin ladder