# Tag Info

### $N$ electrons in solid and its dependance by Fermi-Dirac distribution

You use $n(E)=g(E)f(E)$ when you perform an integral over energy. For example, the number of electrons is given by $$N = \int dE \, g(E) f(E)$$ However, if you are summing over each state, you should ...
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### Symmetry of Crystalline Lattice

Consider you view under electron microscope crystal lattice area marked in yellow circle : Now you move your microscope by a relative vector marked in red, namely by  \delta \vec r = -a_x \hat i - ...
1 vote
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### Can the lattice of an element with face-centered cubic (FCC) crystal structure be regarded as simple cubic (SC)?

The fcc structure can be generated from a sc lattice with a four-atom basis. The sentence above is from lecture notes by Phil Ahrenkiel of South Dakota School of Mines and Technology. So, this means ...
1 vote

### Why do logic ICs only have one transistor layer?

The short answer is "they're working on it." Modern lithography techniques typically etch and dope a layer of monocrystaline silicon. They typically do not add layers of it (in fact, I have ...
1 vote

### Meaning of the momentum vectors $\mathbf{k}$ in electronic band structure

You do an experiment where you measure $E$, the eigenvalues of the energy operator and $\vec k$, the eigenvalues of the Fourier-transformed momentum operator. Since the eigenvalues don't change under ...
1 vote

### Meaning of the momentum vectors $\mathbf{k}$ in electronic band structure

The basic principle can be easily understood in the distribution of momenta of molecules of a gas inside a container. It has nothing to do with location. There are some important differences however: ...
1 vote
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### Meaning of the momentum vectors $\mathbf{k}$ in electronic band structure

In solid-state physics, I struggle to understand momentum vectors $\mathbf{k}$ in reciprocal space. My confusion arises in the meaning of the $\mathbf{k}$ itself. In the Brillouin zone, it can hint ...
1 vote

### Cooper pair attractive power in lattice

The attraction has nothing to do with the electron mass. It is the negative charge of the electron that attracts the positive ions. However, the mass of the electrons plays a role in the dynamics. As ...

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