Quantum Nonlinear Sigma Model for Arbitrary Spin Heisenberg AntiferromagnetsReportar como inadecuado



 Quantum Nonlinear Sigma Model for Arbitrary Spin Heisenberg Antiferromagnets


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In this Letter, we derive a quantum nonlinear sigma model QNLSM for quantum Heisenberg antiferromagnets QHA with arbitrary S spin values. A upper limit of the low temperature is naturally carried out for the reliability of the QNLSM. The S dependence of the effective coupling constant and the spin wave velocity in the QNLSM are also obtained explicitly. The resulting spin wave velocity for 2-dim spin-1-2 QHA highly concurs with the experimental data of high $T c$ compound La2CuO4. The predicted correlation lengths for 2d QHA and spin-gap magnitudes for 1d QHA also agrees with the accurate numerical results.



Autor: Jianhui Dai; Wei-Min Zhang

Fuente: https://archive.org/







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