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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Spin stiffness ： ウィキペディア英語版 Spin stiffness The spin-stiffness or spin rigidity or helicity modulus or the "superfluid density" (for bosons the superfluid density is proportional to the spin stiffness) is a constant which represents the change in the ground state energy of a spin system as a result of introducing a slow in plane twist of the spins. The importance of this constant is in its use as an indicator of quantum phase transitions-- specifically in models with metal-insulator transitions such as Mott insulators. It is also related to other topological invariants such as the Berry phase and Chern numbers as in the Quantum hall effect. ==Mathematically== Mathematically it can be defined by the following equation: :$\backslash rho\_s\; =\; \backslash cfrac\backslash cfrac|\_$ where $E\_0$ is the ground state energy, $\backslash theta$ is the twisting angle, and N is the number of lattice sites. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Spin stiffness」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.