Field-Induced Gap in a Quantum Spin-1/2 Chain in a Strong Magnetic Field

Abstract

Magnetic excitations in copper pyrimidine dinitrate, a spin-1/2 antiferromagnetic chain with alternating $g$-tensor and Dzyaloshinskii-Moriya interactions that exhibits a field-induced spin gap, are probed by means of pulsed-field electron spin resonance spectroscopy. In particular, we report on a minimum of the gap in the vicinity of the saturation field $H_{sat}=48.5$ T associated with a transition from the sine-Gordon region (with soliton-breather elementary excitations) to a spin-polarized state (with magnon excitations). This interpretation is fully confirmed by the quantitative agreement over the entire field range of the experimental data with the DMRG investigation of the spin-1/2 Heisenberg chain with a staggered transverse field.

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Cited by in corpus (11)

• Unconventional spin dynamics in the honeycomb-lattice material $\alpha$-RuCl${}_3$: high-field ESR studies
• Direct determination of exchange parameters in Cs2CuBr4 and Cs2CuCl4: high-field ESR studies
• Matrix product state formulation of frequency-space dynamics at finite temperatures
• ESR modes in a Strong-Leg Ladder in the Tomonaga-Luttinger Liquid Phase
• Boundary Resonances in S = 1/2 Antiferromagnetic Chains under a Staggered Field
• Thermodynamic properties of quantum sine-Gordon spin chain system KCuGaF6
• Dynamical properties of the sine-Gordon quantum spin magnet Cu-PM at zero and finite temperature
• Quantum Dynamics of Solitons in Strongly Interacting Systems on Optical Lattices
• Magnons in a two dimensional transverse field XXZ model
• The Future of the Correlated Electron Problem
• Novel magnetic field tuning of quantum spin excitations in a weakly coupled $S=$1/2 Heisenberg spin chain as seen from NMR