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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 Rashba effect ： ウィキペディア英語版 Rashba effect The Rashba effect, or Rashba-Dresselhaus effect, is a momentum-dependent splitting of spin bands in two-dimensional condensed matter systems (heterostructures and surface states) similar to the splitting of particles and anti-particles in the Dirac Hamiltonian. The splitting is a combined effect of atomic spin-orbit coupling and asymmetry of the potential in the direction perpendicular to the two-dimensional plane. This effect is named in honour of Emmanuel Rashba who discovered it.〔G. Bihlmayer, O. Rader and R. Winkler, Focus on the Rashba effect , New J. Phys. 17, 050202 (2015)〕〔Han Woong Yeom and Marco Grioni, eds, Special issue on electron spectroscopy for Rashba spin-orbit interaction, Journal of Electron Spectroscopy and Related Phenomena, 201, 1-126 (2015)〕 Remarkably, this effect can drive a wide variety of novel physical phenomena even when it is a small correction to the band structure of the two-dimensional metallic state. Additionally, superconductors with large Rashba splitting are suggested as possible realizations of the elusive Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and the longed topological p-wave superconductor. Lately, a momentum dependent pseudospin-orbit coupling has been realized in cold atom systems. ==The Rashba Hamiltonian== The Rashba effect is most easily seen in the simple model Hamiltonian known as the Rashba Hamiltonian :$$ H_=\alpha(\boldsymbol\times\bold)\cdot \hat , where $\backslash alpha$ is the Rashba coupling, $\backslash boldsymbol\; p$ is the momentum and $\backslash boldsymbol\; \backslash sigma$ is the Pauli matrix vector. This is nothing but a two-dimensional version of the Dirac Hamiltonian (with a 90 degrees rotation of the spins). The Rashba model in solids can be derived in the framework of the $\backslash boldsymbol\; k\; \backslash cdot\; \backslash boldsymbol\; p$ theory or from the point of view of a tight binding approximation. However, the specifics of these methods are considered tedious and many prefer an intuitive toy model that gives qualitatively the same physics (quantitatively it gives a poor estimation of the coupling $\backslash alpha$). Here we will introduce the intuitive toy model approach followed by a sketch of a more accurate derivation. 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「Rashba effect」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.