Sep, 1999
Middle-field cusp singularities in the magnetization process of one-dimensional quantum antiferromagnets
PHYSICAL REVIEW B
- ,
- ,
- Volume
- 60
- Number
- 10
- First page
- R6953
- Last page
- R6956
- Language
- English
- Publishing type
- Research paper (scientific journal)
- Publisher
- AMER PHYSICAL SOC
We study the zero-temperature magnetization process (M-H curve) of one-dimensional quantum antiferromagnets using a variant of the density-matrix renormalization group method. For both the S=1/2 zig-zag spin ladder and the S=1 bilinear-biquadratic chain, we find clear cusp-type singularities in the middle-field region of the M-H curve. These singularities are successfully explained in terms of the double-minimum shape of the energy dispersion of the low-lying excitations. For the S=1/2 zig-zag spin ladder, we find that the cusp formation accompanies the Fermi-liquid to non-Fermi-liquid transition. [S0163-1829(99)50834-5].
- Link information
- ID information
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- ISSN : 1098-0121
- eISSN : 1550-235X
- Web of Science ID : WOS:000082777800004