Herd-Immunity
发表于 2025-3-26 21:13:32
http://reply.papertrans.cn/48/4704/470385/470385_31.png
丰富
发表于 2025-3-27 01:50:17
Disorder in Low Dimensionsorder parameter does not eommute with the Hamiltonian. To foeus our diseussion, we eonsider a spin density wave in the z direetion defined by the operator . where i labels the lattiee sites and . is the ordering wave veetor.
外貌
发表于 2025-3-27 06:55:45
From Ground States to Excitations of a good variational state—enables us to calculate the equal time spin correlations at . = 0. Experiments, however, can measure . at finite frequencies and at finite temperatures. It is clear from linear response theory (see Appendix B) that dynamical correlations depend on the . states and energies.
orthodox
发表于 2025-3-27 11:46:26
Quantum Antiferromagnets: Continuum Resultsns to those of the Nonlinear Sigma Model (NLSM) in .+1 dimensions with additional Berry phases. In Chapters 13 and 14, the correlation length ξ for the NLSM was found for .=1,2,3 using the continuum approximation.
narcotic
发表于 2025-3-27 13:44:53
The Continuum Approximation Mermin and Wagner’s Theorem 6.2, there can be no spontaneously broken symmetry at . > 0 in one and two dimensions. Moreover, we know that for the Heisenberg antiferromagnet in one dimension, we do not expect long-range spin order even at . = 0.
amputation
发表于 2025-3-27 20:29:17
http://reply.papertrans.cn/48/4704/470385/470385_36.png
思考才皱眉
发表于 2025-3-28 00:13:34
Textbook 1994 l notes into this book, I found a personal benefit: the organization of what I understand in a (hopefully simple) logical sequence. Very little in this text is my original contribution. Most of the knowledge was collected from the research literature. Some was acquired by conversations with colleag
Indelible
发表于 2025-3-28 04:23:55
http://reply.papertrans.cn/48/4704/470385/470385_38.png
propose
发表于 2025-3-28 09:51:55
http://reply.papertrans.cn/48/4704/470385/470385_39.png
勤勉
发表于 2025-3-28 12:16:46
http://reply.papertrans.cn/48/4704/470385/470385_40.png