期刊
PHYSICAL REVIEW B
卷 93, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.104411
关键词
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资金
- Helmholtz Gemeinschaft via the Virtual Institute New states of matter and their excitations [VH-VI-521]
- HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL)
- Deutsche Forschungsgemeinschaft (DFG, Germany), at HZDR [ZV 6/2-1, ZV 6/2-2]
- Deutsche Forschungsgemeinschaft (DFG, Germany), Gottingen [CRC/SFB 1073, B03]
- program Mercury 3.3 [94]
The material copper pyrimidine dinitrate (Cu-PM) is a quasi-one-dimensional spin system described by the spin-1/2 XXZ Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interactions. Based on numerical results obtained by the density-matrix renormalization group, exact diagonalization, and accompanying electron spin resonance (ESR) experiments we revisit the spin dynamics of this compound in an applied magnetic field. Our calculations for momentum and frequency-resolved dynamical quantities give direct access to the intensity of the elementary excitations at both zero and finite temperature. This allows us to study the system beyond the low-energy description by the quantum sine-Gordon model. We find a deviation from the Lorentz invariant dispersion for the single-soliton resonance. Furthermore, our calculations only confirm the presence of the strongest boundary bound state previously derived from a boundary sine-Gordon field theory, while composite boundary-bulk excitations have too low intensities to be observable. Upon increasing the temperature, we find a temperature-induced crossover of the soliton and the emergence of new features, such as interbreather transitions. The latter observation is confirmed by our ESR experiments on Cu-PM over a wide range of the applied field.
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