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1 <?xml version="1.0" encoding="UTF-8"?>
2 <!-- This DocBook file was created by LyX 2.4.0-beta2
3   See https://www.lyx.org/ for more information -->
4 <article xml:lang="it_IT" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:m="http://www.w3.org/1998/Math/MathML" xmlns:xi="http://www.w3.org/2001/XInclude" version="5.2">
5 <title>Test</title>
6 <figure role='theorem'>
7 <title>Teorema 1.</title>
8 <para>For electrons in a perfect crystal</para>
9 <para>there is a basis of wave functions with the following two properties:</para>
10 </figure>
11 <figure role='theorem'>
12 <title>Teorema 2.</title>
13 <para>1) each of these wave functions is an energy eigenstate;</para>
14 <para>2) each of these wave functions is a Bloch state, meaning that this wave function <inlineequation>
15 <alt role='tex'>\psi</alt>
16 <m:math display="inline">
17  
18 <m:mrow><m:mi>&#x3C8;</m:mi>
19 </m:mrow>
20 </m:math>
21 </inlineequation> can be written in the form <inlineequation>
22 <alt role='tex'>\psi(r)=u(\boldsymbol{r})e^{i\boldsymbol{k}\cdot\boldsymbol{r}}</alt>
23 <m:math display="inline">
24  
25 <m:mrow>
26  <m:mrow><m:mi>&#x3C8;</m:mi>
27   <m:mrow>
28    <m:mo form='prefix' fence='true' stretchy='true' symmetric='true'>(</m:mo>
29    <m:mi>r</m:mi>
30    <m:mo form='postfix' fence='true' stretchy='true' symmetric='true'>)</m:mo>
31   </m:mrow>
32   <m:mo>=</m:mo>
33   <m:mi>u</m:mi>
34   <m:mrow>
35    <m:mo form='prefix' fence='true' stretchy='true' symmetric='true'>(</m:mo>
36    <m:mstyle mathvariant='bold'>
37    <m:mi>r</m:mi></m:mstyle>
38    <m:mo form='postfix' fence='true' stretchy='true' symmetric='true'>)</m:mo>
39   </m:mrow>
40   <m:msup>
41    <m:mi>e</m:mi>
42    <m:mrow>
43     <m:mi>i</m:mi>
44     <m:mstyle mathvariant='bold'>
45     <m:mi>k</m:mi></m:mstyle><m:mo>&#x22C5;</m:mo>
46     <m:mstyle mathvariant='bold'>
47     <m:mi>r</m:mi></m:mstyle>
48    </m:mrow>
49   </m:msup>
50  </m:mrow>
51 </m:mrow>
52 </m:math>
53 </inlineequation> where <inlineequation>
54 <alt role='tex'>u</alt>
55 <m:math display="inline">
56  
57 <m:mrow>
58  <m:mi>u</m:mi>
59 </m:mrow>
60 </m:math>
61 </inlineequation> has the same periodicity as the atomic structure of the crystal: <inlineequation>
62 <alt role='tex'>u_{\boldsymbol{k}}(\boldsymbol{r})=u_{\boldsymbol{k}}(\boldsymbol{r}+\boldsymbol{n}\cdot\boldsymbol{a})</alt>
63 <m:math display="inline">
64  
65 <m:mrow>
66  <m:mrow>
67   <m:msub>
68    <m:mi>u</m:mi>
69    <m:mstyle mathvariant='bold'>
70    <m:mi>k</m:mi></m:mstyle>
71   </m:msub>
72   <m:mrow>
73    <m:mo form='prefix' fence='true' stretchy='true' symmetric='true'>(</m:mo>
74    <m:mstyle mathvariant='bold'>
75    <m:mi>r</m:mi></m:mstyle>
76    <m:mo form='postfix' fence='true' stretchy='true' symmetric='true'>)</m:mo>
77   </m:mrow>
78   <m:mo>=</m:mo>
79   <m:msub>
80    <m:mi>u</m:mi>
81    <m:mstyle mathvariant='bold'>
82    <m:mi>k</m:mi></m:mstyle>
83   </m:msub>
84   <m:mrow>
85    <m:mo form='prefix' fence='true' stretchy='true' symmetric='true'>(</m:mo>
86    <m:mrow>
87     <m:mstyle mathvariant='bold'>
88     <m:mi>r</m:mi></m:mstyle>
89     <m:mo>+</m:mo>
90     <m:mstyle mathvariant='bold'>
91     <m:mi>n</m:mi></m:mstyle><m:mo>&#x22C5;</m:mo>
92     <m:mstyle mathvariant='bold'>
93     <m:mi>a</m:mi></m:mstyle>
94    </m:mrow>
95    <m:mo form='postfix' fence='true' stretchy='true' symmetric='true'>)</m:mo>
96   </m:mrow>
97  </m:mrow>
98 </m:mrow>
99 </m:math>
100 </inlineequation>.</para>
101 </figure>
102 </article>