Mermin-Wagner-Hohenberg定理是由物理学家N. David Mermin,Herbert Wagner和Peter Hohenberg在20世纪60年代提出的。该定理的核心观点是,在一维和二维的经典物理系统中,存在一种称为“Mermin-Wagner-Hohenberg”机制的机制,使得无序状态成为可能。换句话说,这个定理告诉我们,在低维系统中,热涨落的影响使得长程有序被破坏...
In this paper, we present an extension of the Hohenberg-Mermin-Wagner theorem to give a rigorous proof of the impossibility of long-range ferromagnetic order in an itinerant electron system without spin-orbit coupling or magnetic dipole interactions. We also comment on some situations where there ...
lsoe定理的等效性Godtn刘红,刘宪。1中北 009(.国科技大学研究生院(京)地学部,北京1 03;.2四川化工工程学校分析教研室,四川成都l106 l3)ooiou研bad模型基态中电子配对摘要: 应用零温情形下的Bglbv不等式,究了一维和二维H ubr铁长发bad模型的自旋(荷)发和磁性(磁和反 ...
应用零温情形下的Bogoliubov不等式,研究了一维和二维Hubbard模型基态中电子配对和磁性(铁磁和反铁磁)长程序的可能性.发现如果在一维和二维Hubbard模型的自旋(电荷)激发谱中存在能隙,则该系统在基态中不可能呈现出磁性(或电子配对)的长程序,并由此从低维Hub—bard模型说明了零温Hohenberg—Mermin—Wagner定理与Goldstone...
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Physical limitations of the Hohenberg-Mermin-Wagner theorem The absence of ferromagnetism in the 2d-Heisenberg model has been already anticipated by Felix Bloch (Bloch 1930), with physically plausible arguments, based on elementary spin wave theory. In the isotropic Heisenberg ferromagnet at temp... ...
零温Hohenberg-Mermin-Wagner定理Goldstone定理Hubbard模型应用零温情形下的Bogoliubov不等式,研究了一维和二维Hubbard模型基态中电子配对和磁性(铁磁和反铁磁)长程序的可能性.发现如果在一维和二维Hubbard模型的自旋(电荷)激发谱中存在能隙,则该系统在基态中不可能呈现出磁性(或电子配对)的长程序,并由此从低维Hubbar...
Apart from the N = 1 case, these disappear in d = 2 consistently with the Mermin-Wagner-Hohenberg theorem. Finally, we study O(N = 0)-universality classes and find an infinite family of these in two dimensions.%141601.1-141601.5Alessandro Codello...
We argue that the changes are intimately related to the Mermin-Wagner-Hohenberg-Coleman theorem, and illustrate this situation using a nonlinear sigma model as a working example. We compute the quantum vacuum energy, which consists of the usual Casimir contribution plus a semiclassical contribution, ...