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 \u7d50\u6676\u5185\u306e\u96fb\u5b50\u3068\u30d6\u30ea\u30e5\u30a2\u30f3\u30be\u30fc\u30f3[\u7de8\u96c6]\u91cf\u5b50\u529b\u5b66\u3067\u306f\u3001\u6ce2\u52d5\u95a2\u6570\u3092\u03c8\u3068\u3057\u3001R\u3092\u5b9f\u7a7a\u9593\u3067\u306e\u7d50\u6676\u5185\u306e\u9069\u5f53\u306a\u5b9f\u683c\u5b50\u30d9\u30af\u30c8\u30eb\u3068\u3059\u308b\u3068\u3001\u03c8k(r+R)=eik\u22c5R\u03c8k(r){displaystyle psi _{mathbf {k} }(mathbf {r} +mathbf {R} )=e^{imathbf {k} cdot mathbf {R} }psi _{mathbf {k} }(mathbf {r} )}\u304c\u6210\u308a\u7acb\u3064\u3088\u3046\u306ak\u304c\u5b58\u5728\u3059\u308b\u3002\u3053\u306ek\u306f\u6ce2\u6570\u30d9\u30af\u30c8\u30eb\u3067\u3042\u308b\uff08\u53c2\u7167\uff1a\u30d6\u30ed\u30c3\u30db\u306e\u5b9a\u7406\uff09\u3002\u6ce2\u6570\u30d9\u30af\u30c8\u30ebk\u306e\u96c6\u5408\u3092\u6ce2\u6570\u7a7a\u9593\uff08k\u7a7a\u9593\uff09\u3068\u547c\u3076\u3002\u307e\u305f\u3001\u4efb\u610f\u306e\u9006\u683c\u5b50\u30d9\u30af\u30c8\u30ebG\u3068R\u3068\u306f\u3001  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