{"id":208791,"date":"2024-03-21T14:07:27","date_gmt":"2024-03-21T14:07:27","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%eb%b2%a0%eb%a6%ac-%ea%b3%a1%eb%a5%a0-%eb%b0%a9%ec%a0%95%ec%8b%9d-%ec%a0%95%ec%9d%98-%ea%b3%84%ec%82%b0-%eb%b0%8f-%ec%9d%91%ec%9a%a9\/"},"modified":"2024-05-15T11:33:12","modified_gmt":"2024-05-15T11:33:12","slug":"%eb%b2%a0%eb%a6%ac-%ea%b3%a1%eb%a5%a0-%eb%b0%a9%ec%a0%95%ec%8b%9d-%ec%a0%95%ec%9d%98-%ea%b3%84%ec%82%b0-%eb%b0%8f-%ec%9d%91%ec%9a%a9","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ko\/%eb%b2%a0%eb%a6%ac-%ea%b3%a1%eb%a5%a0-%eb%b0%a9%ec%a0%95%ec%8b%9d-%ec%a0%95%ec%9d%98-%ea%b3%84%ec%82%b0-%eb%b0%8f-%ec%9d%91%ec%9a%a9\/","title":{"rendered":"\ubca0\ub9ac \uace1\ub960 \ubc29\uc815\uc2dd | \uc815\uc758, \uacc4\uc0b0 \ubc0f \uc751\uc6a9"},"content":{"rendered":"<p class=\"sidekick\">\ubca0\ub9ac \uace1\ub960 \ubc29\uc815\uc2dd\uc5d0 \ub300\ud574 \uc124\uba85\ud558\uba70 \uc591\uc790\uc5ed\ud559\uc5d0\uc11c\uc758 \uc911\uc694\uc131\uacfc \ub2e4\uc591\ud55c \uacfc\ud559\uc801, \uacf5\ud559\uc801 \uc751\uc6a9\uc744 \ub2e4\ub8f9\ub2c8\ub2e4.<\/p>\n<h2>\ubca0\ub9ac \uace1\ub960 \ubc29\uc815\uc2dd\uc774\ub780?<\/h2>\n<p>\ubca0\ub9ac \uace1\ub960 \ubc29\uc815\uc2dd\uc740 \uc591\uc790\uc5ed\ud559\uc5d0\uc11c \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud558\ub294 \uac1c\ub150\uc73c\ub85c, \ud30c\ub77c\ubbf8\ud130 \uacf5\uac04\uc5d0\uc11c \uc591\uc790\uacc4\uc758 \ud30c\ub77c\ubbf8\ud130\ub97c \ubcc0\ud654\uc2dc\ucf30\uc744 \ub54c \ubc1c\uc0dd\ud558\ub294 \uc704\uc0c1\uc758 \ubcc0\ud654\ub97c \uc124\uba85\ud569\ub2c8\ub2e4. \uc774 \ubc29\uc815\uc2dd\uc740 \ub9c8\uc774\ud074 \ubca0\ub9ac\uac00 1980\ub144\ub300\uc5d0 \ub3c4\uc785\ud55c \ubca0\ub9ac \uc704\uc0c1(Berry&#8217;s phase)\uc5d0\uc11c \uc720\ub798\ud558\uc600\uc73c\uba70, \ud2b9\ud788 \uacb0\uc815 \uad6c\uc870\uc640 \uac19\uc740 \ubbf8\uc2dc\uc801 \uc2dc\uc2a4\ud15c\uc5d0\uc11c \uc804\uc790\uc758 \uac70\ub3d9\uc744 \ud574\uc11d\ud558\ub294 \ub370 \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \ubca0\ub9ac \uace1\ub960\uc740 \ud30c\ub77c\ubbf8\ud130 \uacf5\uac04\uc758 \uac01 \uc9c0\uc810\uc5d0\uc11c \uc704\uc0c1\uc758 \uace1\ub960\uc744 \uce21\uc815\ud558\uba70, \uc774\ub294 \uc591\uc790\uacc4\uc758 \uc9c0\uc624\uba54\ud2b8\ub9ac\uc801 \ud2b9\uc131\uc744 \ud30c\uc545\ud558\ub294 \ub370 \uc911\uc694\ud55c \ub3c4\uad6c\uc785\ub2c8\ub2e4.<\/p>\n<h2>\ubca0\ub9ac \uace1\ub960\uc758 \uacc4\uc0b0<\/h2>\n<p>\ubca0\ub9ac \uace1\ub960\uc744 \uacc4\uc0b0\ud558\uae30 \uc704\ud574\uc11c\ub294 \uc6b0\uc120 \ud30c\ub77c\ubbf8\ud130\uc5d0 \uc758\uc874\ud558\ub294 \ud574\ubc00\ud1a0\ub2c8\uc548($H(\\vec{\\lambda})$)\uc774 \uc8fc\uc5b4\uc838\uc57c \ud558\uba70, \uc774\uc5d0 \ub300\ud55c \uace0\uc720\uc0c1\ud0dc\ub4e4($|\\psi_n(\\vec{\\lambda})\\rangle$)\uc744 \uad6c\ud560 \uc218 \uc788\uc5b4\uc57c \ud569\ub2c8\ub2e4. \ubca0\ub9ac \uace1\ub960\uc740 \ubca0\ub9ac \uc5f0\uacb0(Berry connection) \uc544\uc774\ub4e4\uc744 \ud1b5\ud574 \uc815\uc758\ub429\ub2c8\ub2e4. \ubca0\ub9ac \uc5f0\uacb0 $A_{\\lambda_i}$\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \uacc4\uc0b0\ub429\ub2c8\ub2e4:<br \/>\n\\[ A_{\\lambda_i} = \\langle \\psi_n(\\vec{\\lambda}) | \\frac{\\partial}{\\partial \\lambda_i} | \\psi_n(\\vec{\\lambda}) \\rangle \\]<br \/>\n\uc774\ub54c, $|\\psi_n(\\vec{\\lambda})\\rangle$\ub294 $\\lambda_i$\uc5d0 \ub300\ud55c \ud30c\ub77c\ubbf8\ud130\ud654\ub41c \uace0\uc720\uc0c1\ud0dc\uc785\ub2c8\ub2e4.<\/p>\n<p>\ubca0\ub9ac \uace1\ub960 $F_{ij}$\uc740 \ubca0\ub9ac \uc5f0\uacb0\uc744 \ud1b5\ud574 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<br \/>\n\\[ F_{ij} = \\frac{\\partial A_j}{\\partial \\lambda_i} &#8211; \\frac{\\partial A_i}{\\partial \\lambda_j} &#8211; i[A_i, A_j] \\]<br \/>\n\uc5ec\uae30\uc11c, $i$\uc640 $j$\ub294 \ud30c\ub77c\ubbf8\ud130 \uacf5\uac04\uc758 \uc11c\ub85c \ub2e4\ub978 \ucc28\uc6d0\uc744 \ub098\ud0c0\ub0c5\ub2c8\ub2e4.<\/p>\n<h2>\ubca0\ub9ac \uace1\ub960\uc758 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