\Part{cm}
    \desc{Condensed matter physics}{}{}
    \desc[german]{Festkörperphysik}{}{}

    \TODO{van hove singularities}

    \begin{formula}{dos}
        \desc{Density of states (DOS)}{}{\QtyRef{volume}, $N$ number of energy levels, \QtyRef{energy}}
        \desc[german]{Zustandsdichte (DOS)}{}{\QtyRef{volume}, $N$ Anzahl der Energieniveaus, \QtyRef{energy}}
        \quantity{D}{\per\m^3}{s}
        \eq{D(E) = \frac{1}{V}\sum_{i=1}^{N} \delta(E-E(\vec{k_i}))}
    \end{formula}

\Section{bond}
    \desc{Bonds}{}{}
    \desc[german]{Bindungen}{}{}
    \begin{formula}{metallic}
        \desc{Metallic bond}{}{}
        \desc[german]{Metallbindung}{}{}
        \ttxt{\eng{
            \begin{itemize}
                \item Delocalized electrons form a cloud
                \item High \qtyRef[electrical]{conductivity} and \qtyRef[thermal]{thermal_conductivity} conductivity
                \item No internal electric field
            \end{itemize}
        }\ger{
            \begin{itemize}
                \item Elektronen delokalisiert und bilden Wolke
                \item Hohe \qtyRef[elektrische]{conductivity} und \qtyRef[thermische]{thermal_conductivity} Leitfähigkeit
                \item Kein internes elektrisches Feld
            \end{itemize}
        }}
    \end{formula}

    \begin{formula}{covalent}
        \desc{Covalent bond}{}{}
        \desc[german]{Kolvalente Bindung}{}{}
        \ttxt{\eng{
            \begin{itemize}
                \item \fRef{cm:band:hybrid_orbitals} of shared electrons
                \item Highly directional
                \item Varying \qtyRef[electrical]{conductivity} and high \qtyRef[thermal]{thermal_conductivity} conductivity
            \end{itemize}
        }\ger{
            \begin{itemize}
                \item \fRef{cm:band:hybrid_orbitals} geteilter Elektronen
                \item Richtungsabhängige Bindung
                \item Verschiedene \qtyRef[elektrische]{conductivity} und hohe \qtyRef[thermische]{thermal_conductivity} Leitfähigkeiten
            \end{itemize}
        }}
    \end{formula}

    \begin{formula}{ionic}
        \desc{Ionic bond}{}{}
        \desc[german]{Ionenbindung}{}{}
        \ttxt{\eng{
            \begin{itemize}
                \item Charge transfer from anion to cation
                \item Non.directional bonding
                \item Strong bond
                \item Low \qtyRef[electrical]{conductivity} and high \qtyRef[thermal]{thermal_conductivity} conductivity
                \item Always in combination with a \fRef{:::covalent}
            \end{itemize}
        }\ger{
            \begin{itemize}
                \item Ladungstransfer von Anion zu Kation
                \item Richtungsunabängig
                \item Starke Bindung
                \item Geringe \qtyRef[elektrische]{conductivity} und hohe \qtyRef[thermische]{thermal_conductivity} Leitfähigkeit
                \item Immer in Kombination mit einer \fRef[kovalenten Bindung]{:::covalent}
            \end{itemize}
        }}
    \end{formula}

    \begin{formula}{van-der-waals}
        \desc{Van der Waals bond}{}{}
        \desc[german]{Van-der-Waals Bindung}{}{}
        \ttxt{\eng{
            \begin{itemize}
                \item Dipole-dipole interaction from local charge fluctuations
                \item Weak bond
            \end{itemize}
        }\ger{
            \begin{itemize}
                \item Dipol-Dipol Wechselwirkung durch lokale Ladungsfluktuationen
                \item Schwache Bindung
            \end{itemize}
        }}
    \end{formula}

