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authorPrefetch2021-02-20 10:36:16 +0100
committerPrefetch2021-02-20 10:36:16 +0100
commit64722d5b5b4baff56ad593fe0de8c25907d85472 (patch)
tree64e386784076f6f6483035d32cee7d0ffe35c845 /static/know
parent04ca326bd43c1798d5b1dfad9afa4ed8913bb7f6 (diff)
Fix dead links + update Zola config
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<h1 id="blochs-theorem">Bloch’s theorem</h1>
-<p>In quantum mechanics, <em>Bloch’s theorem</em> states that, given a potential <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>V</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">V(\vec{r})</annotation></semantics></math> which is periodic on a lattice, i.e. <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>V</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo><mo>=</mo><mi>V</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo>+</mo><mover><mi>a</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">V(\vec{r}) = V(\vec{r} + \vec{a})</annotation></semantics></math> for a primitive lattice vector <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mover><mi>a</mi><mo accent="true">⃗</mo></mover><annotation encoding="application/x-tex">\vec{a}</annotation></semantics></math>, then it follows that the solutions <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>ψ</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">\psi(\vec{r})</annotation></semantics></math> to the time-independent <a href="/know/page/schroedinger-equation">Schrödinger equation</a> take the following form, where the function <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>u</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">u(\vec{r})</annotation></semantics></math> is periodic on the same lattice, i.e. <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>u</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo><mo>=</mo><mi>u</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo>+</mo><mover><mi>a</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">u(\vec{r}) = u(\vec{r} + \vec{a})</annotation></semantics></math>:</p>
+<p>In quantum mechanics, <em>Bloch’s theorem</em> states that, given a potential <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>V</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">V(\vec{r})</annotation></semantics></math> which is periodic on a lattice, i.e. <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>V</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo><mo>=</mo><mi>V</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo>+</mo><mover><mi>a</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">V(\vec{r}) = V(\vec{r} + \vec{a})</annotation></semantics></math> for a primitive lattice vector <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mover><mi>a</mi><mo accent="true">⃗</mo></mover><annotation encoding="application/x-tex">\vec{a}</annotation></semantics></math>, then it follows that the solutions <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>ψ</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">\psi(\vec{r})</annotation></semantics></math> to the time-independent Schrödinger equation take the following form, where the function <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>u</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">u(\vec{r})</annotation></semantics></math> is periodic on the same lattice, i.e. <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>u</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo><mo>=</mo><mi>u</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo>+</mo><mover><mi>a</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo></mrow><annotation encoding="application/x-tex">u(\vec{r}) = u(\vec{r} + \vec{a})</annotation></semantics></math>:</p>
<p><math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mtable><mtr><mtd columnalign="right"><menclose notation="box"><mrow><mi>ψ</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo><mo>=</mo><mi>u</mi><mo stretchy="false" form="prefix">(</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover><mo stretchy="false" form="postfix">)</mo><msup><mi>e</mi><mrow><mi>i</mi><mover><mi>k</mi><mo accent="true">⃗</mo></mover><mo>⋅</mo><mover><mi>r</mi><mo accent="true">⃗</mo></mover></mrow></msup></mrow></menclose></mtd></mtr></mtable><annotation encoding="application/x-tex">
\begin{aligned}
\boxed{