(************** Content-type: application/mathematica ************** Mathematica-Compatible Notebook This notebook can be used with any Mathematica-compatible application, such as Mathematica, MathReader or Publicon. The data for the notebook starts with the line containing stars above. To get the notebook into a Mathematica-compatible application, do one of the following: * Save the data starting with the line of stars above into a file with a name ending in .nb, then open the file inside the application; * Copy the data starting with the line of stars above to the clipboard, then use the Paste menu command inside the application. Data for notebooks contains only printable 7-bit ASCII and can be sent directly in email or through ftp in text mode. Newlines can be CR, LF or CRLF (Unix, Macintosh or MS-DOS style). 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For more information on notebooks and Mathematica-compatible applications, contact Wolfram Research: web: http://www.wolfram.com email: info@wolfram.com phone: +1-217-398-0700 (U.S.) Notebook reader applications are available free of charge from Wolfram Research. *******************************************************************) (*CacheID: 232*) (*NotebookFileLineBreakTest NotebookFileLineBreakTest*) (*NotebookOptionsPosition[ 31819, 812]*) (*NotebookOutlinePosition[ 32793, 842]*) (* CellTagsIndexPosition[ 32749, 838]*) (*WindowFrame->Normal*) Notebook[{ Cell[BoxData[{ \(\("\";\)\[IndentingNewLine]\[IndentingNewLine]\), \ "\[IndentingNewLine]", \(\("\";\)\[IndentingNewLine]\), "\[IndentingNewLine]", \(\(H0 = {{\[CapitalDelta], 0}, {0, \(-\[CapitalDelta]\)}};\)\), "\[IndentingNewLine]", \(\(H1 = {{0, 1}, {1, 0}};\)\)}], "Input"], Cell[BoxData[{ \(\(H = H0 + \[Lambda]\ H1;\)\), "\[IndentingNewLine]", \(MatrixForm[H]\)}], "Input"], Cell[BoxData[ \(sol = Simplify[Eigensystem[H]]\)], "Input"], Cell[BoxData[{ \(eigenvalue0 = sol[\([1, 1]\)]\), "\[IndentingNewLine]", \(eigenvalue1 = sol[\([1, 2]\)]\)}], "Input"], Cell[BoxData[ \(\("\";\)\)], \ "Input"], Cell[BoxData[{ \(\(eigenstate0 = {Cot[\[Theta]] - 1/Sin[\[Theta]], 1};\)\), "\[IndentingNewLine]", \(\(eigenstate1 = {1, Tan[\[Theta]]/\((1 + Sqrt[1 + Tan[\[Theta]]^2])\)};\)\)}], "Input"], Cell[BoxData[{ \(MatrixForm[eigenstate0]\), "\[IndentingNewLine]", \(MatrixForm[eigenstate1]\)}], "Input"], Cell[BoxData[ \(\("\< Normalizations ?\>";\)\)], "Input"], Cell[BoxData[{ \(\[IndentingNewLine]\(normeigenstate0 = Simplify[ FullSimplify[ eigenstate0/ Sqrt[eigenstate0 . eigenstate0]]\ \ /. \ {\@\(\(Sec[\[Theta]/2]\^2\)\(\ \ \)\) \[Rule] Sec[\[Theta]/2], 1\/\@Sec[\[Theta]\/2]\^2 \[Rule] 1/Sec[\[Theta]/2]}];\)\), "\[IndentingNewLine]", \(\(normeigenstate1 = Simplify[ Simplify[ FullSimplify[ eigenstate1/ Sqrt[eigenstate1 . eigenstate1]]\ /. \ \@Sec[\[Theta]]\^2 \[Rule] Sec[\[Theta]]]\ /. \ {\@\(\(Sec[\[Theta]/2]\^2\)\(\ \)\) \ \[Rule] Sec[\[Theta]/2], 1\/\@Sec[\[Theta]\/2]\^2 \[Rule] 1/Sec[\[Theta]/2]}];\)\)}], "Input"], Cell[BoxData[{ \(MatrixForm[normeigenstate0]\), "\[IndentingNewLine]", \(MatrixForm[normeigenstate1]\)}], "Input"], Cell[BoxData[ \(FullSimplify[ eigenstate0 . eigenstate1]\ /. \ \@Sec[\[Theta]]\^2 \[Rule] Sec[\[Theta]]\)], "Input"], Cell[BoxData[ \(FullSimplify[normeigenstate0 . normeigenstate0]\)], "Input"], Cell[BoxData[ \(Simplify[normeigenstate1 . normeigenstate1]\)], "Input"], Cell[BoxData[{ \(\[IndentingNewLine]\("\";\)\), "\n", \(MatrixForm[ FullSimplify[ H . eigenstate0]]\ /. \ \[Lambda] \[Rule] \[CapitalDelta]\ Tan[\ \[Theta]]\), "\n", \(FullSimplify[\((H . eigenstate0 \[Equal] eigenvalue0\ eigenstate0)\)\ /. \ \[Lambda] \[Rule] \ \ \[CapitalDelta]\ Tan[\[Theta]]]\), "\[IndentingNewLine]", \(Simplify[%\ /. \ \@\(\[CapitalDelta]\^2\ Sec[\[Theta]]\^2\) \[Rule] \ \[CapitalDelta]\ Sec[\[Theta]]]\)}], "Input"], Cell[BoxData[{ \(MatrixForm[ FullSimplify[ H . eigenstate1]]\ /. \ \[Lambda] \[Rule] \[CapitalDelta]\ Tan[\ \[Theta]]\), "\n", \(FullSimplify[\((H . eigenstate1 \[Equal] eigenvalue1\ eigenstate1)\)\ \ /. \ \[Lambda] \[Rule] \ \[CapitalDelta]\ Tan[\[Theta]]]\), "\[IndentingNewLine]", \(FullSimplify[%\ /. \ {\@\(\[CapitalDelta]\^2\ Sec[\[Theta]]\^2\) \ \[Rule] \[CapitalDelta]\ Sec[\[Theta]], \@Sec[\[Theta]]\^2 \[Rule] Sec[\[Theta]]}]\)}], "Input"], Cell[BoxData[ \(Perturbation\ Expansion\ for\ wave\ function\)], "Input", Editable->False], Cell[BoxData[ \(\*"\"\<|\!\(\[Psi]\_\[Alpha]\)> = |\[Alpha] > + \!\(\[Sum]\+\(\ \[Alpha] \[NotEqual] \[Beta]\)\) |\[Beta]>\!\(\(\(\(<\)\(\[Beta]\)\) | H1 | \ \(\(\[Alpha]\)\(>\)\)\)\/\((E\_\[Alpha] - E\_\[Beta])\)\)\>\""\)], "Input"], Cell[BoxData[{ \(\("\";\)\ \), "\[IndentingNewLine]", \(\(alpha = {0, 1};\)\), "\[IndentingNewLine]", \(\("\< There is only one |\[Beta]> state =beta\>";\)\), "\ \[IndentingNewLine]", \(\("\";\)\), "\[IndentingNewLine]", \(\ \ \(E0alpha = \(-\[CapitalDelta]\)\ ;\)\), "\[IndentingNewLine]", \(\ \ \ \(E0beta = \[CapitalDelta];\)\), "\[IndentingNewLine]", \(\(beta = {1, 0};\)\)}], "Input"], Cell[BoxData[{ \(MatrixForm[alpha]\), "\[IndentingNewLine]", \(MatrixForm[beta]\)}], "Input"], Cell[BoxData[{ \(\(psi0 = alpha\ + \ \[Lambda]\ beta\ \ \((alpha . 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