Solid-state physics studies how macroscopic properties of solids (mechanical, electrical, optical, etc.) result from their microscopic structure. It usually deals with the scale where quantum properties of the particles are substantial.
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Understanding drift velocities in currents
I have a doubt about the understanding of drift velocities in a current. My problem is that the textbook speaks very loosely about this. It's like: "well, if we apply a field $E$ then the charges will ...
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1answer
43 views
To which real densities do carrier densities in the semi-classical model of a crystal correspond?
In the semi-classical model of a crystal in solid state physics, electrons and holes are assigned effective masses that account for their different mobilities. E.g. in silicon, holes have a bigger ...
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66 views
What is paramagnetic current-current correlation?
I know what paramagnetism is. But first I want to know about the paramagnetic current and then the above-mentioned correlation?
Actually, I am working on a paper on superconductivity where I have ...
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71 views
Can anyone tell me formula for lattice $a$, $b$ and $c$ in a hexagonal structure?
Can anyone tell me formula for lattice constants $a$, $b$ and $c$ in a hexagonal structure? $a$ , $b$ and $c$ are units cell of structure. As we see in cubic structure we have a formula to calculate ...
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2answers
220 views
In the diode equation, why the exponential $\exp$ and the ideality factor $n$ are there? What do they represent & what is their significance?
In the Shockley diode equation, why the exponential $\exp$ and the ideality factor $n$ are there? What do they represent & what is their significance?
I have to work on Solar Photovoltaics, and ...
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145 views
Energy spectrum of a tight-binding model
Consider the one-dimensional tight-binding Hamiltonian
$$\mathcal{H}=t\sum_m\left(a^\dagger_m a_{m+1}+a^\dagger_{m+1} a_{m}\right).$$
With the lattice constant set to 1, the energy spectrum is given ...
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84 views
What papers detail the early research on heavy fermion superconductors?
Can someone point me to the papers detailing when/where/how heavy fermion superconductors were first synthesized, tested and documented?
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84 views
Where can I find hamiltonians + lagrangians?
Where would you say I can start learning about Hamiltonians, Lagrangians ... Jacobians? and the like?
I was trying to read Ibach and Luth - Solid State Physics, and suddenly
(suddenly a Hamiltonian ...
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163 views
Formation of the overlap in metal electron bands
I understand that metals have overlapping of valence and conduction bands. But is this because there exists a partial conduction band within the top part of a metal valence band, or because the ...
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1answer
411 views
Van Hove Singularity at Saddle Point
this is another one of those examples where textbooks always just gloss over it with the remark that it "can be done" and then just state the result:
I want to compute the general form of a van Hove ...
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120 views
Working with atomic (?) units in solid state physics
I'm having some troubles understanding the units used in solid state physics paper. In the paper I read
$\Lambda a \sim 1$
where $\Lambda$ is a momentum cutoff and $a$ is the lattice spacing of a ...
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2answers
216 views
4 digit Miller Index for a cubic structure?
As the title states, can a Miller index for a cubic structure have 4 digits? If I have a structure with intercepts (2,8,3) on the x-y-z axes respectively, the following Miller index would be (12,3,8), ...
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54 views
I can't figure out crystal planes with negative intercepts
As seen above, I don't follow how you figure out those planes. It seems they're not using the origin labeled. I'm not really sure I understand spatially what's going on in the left figure so let's ...
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58 views
How is a Majorana fermion created when a s-wave superconductors is in proximity to a topological insulator (e.g. via an antidot)
Kane and Fu proposed a few geometries how to create Majorana zero modes using a s-wave superconductor in proximity to a 3D topological insulator (TI).
-> ...
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1answer
136 views
Supplements for Kittel's Solid State Physics? [duplicate]
I think by supplement I really mean replace. I spent a lot of time agonizing over the first chapter of Kittel as he introduces a bunch of concepts such as Bravais lattice and he doesn't clearly define ...
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33 views
Residual symmetries of the superposition of two fcc lattices
Fcc lattices are Bravais lattices and so are invariant under a set of discrete translations plus inversions over the 3 axis ($x\rightarrow -x$,$y\rightarrow -y$,$z\rightarrow -z$). When one superposes ...
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1answer
186 views
Learning roadmap for solid state physics [duplicate]
I am a PhD student in mathematics who knows little more about physics than what one learns in high school. For my research on tilings of space and aperiodic order, every now and then I have to skim a ...
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66 views
How to derive the divergence leading to Kohn anomalies?
I'm trying to understand the mathematical derivation given in the book "A Quantum Approach to Condensed Matter Physics" on page 215 (see 1), for explaining how the phonon-energy perturbed by ...
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1answer
109 views
What is crystal field anisotropy or effect ? It forces the magnetic moment to point in particular local direction..
Can you give a basic explanation of what is crystal field anisotropy ?
What is the reason to arise ?
In spin ice it forces the dipoles to point in the local 111 direction.
For partially filled rare ...
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0answers
78 views
Decomposition of elastic constants of a crystalline material
I have performed a calculation the tensor of elastic constants (or stiffness tensor) for a given crystalline material. From there, I calculated various elastic properties, such as Young’s modulus, ...
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1answer
111 views
Does anyone know the difference and relation between $k\cdot p$ method and tight binding (TB) method?
Among the methods of calculating energy bands for crystals, first-principles method is the most accurate. Besides first principles, two commonly used modeling methods are the $k\cdot p$ method and ...
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170 views
Electron Fermi gas
My question is about 2-dimensional Fermi gas of electrons.
What is magnetic susceptibility when $T<<T_F$ (where $T_F$ is Fermi Temperature)
and,
What is the ratio between Pauli and Curie ...
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169 views
Any interesting physics theroies/equations to be used in a video game? [closed]
I am designing a little game based on Newtons Graviational Law.
Are there any theories that I can use to create games?
thanks
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372 views
Evaluation of band gap from transmittance
How can I evaluate the band gap of my ZnO thin film.
Thickness=d=80 nm
I’m aware of alpha=-1/d*log(T)
But I can’t fit a line to my data.
And: How can I smoothen my data on about 346 nm?
Do you have ...
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293 views
Fermi level in disordered amorphous and/or organic semiconductors
So, the Fermi level in crystals is pretty easy to understand. Been using it and talking about it in terms of the highest occupied level forever. However, I'm now reading about disordered systems. A ...
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2answers
52 views
How does a force on electrons produce a force on a metal plate
In a paper from Cadwell Magnetic damping: Analysis of an eddy current brake using an airtrack about eddy current brakes the author explains the effect qualitatively as follows:
When a ...
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1answer
184 views
Why do electrons make a Fermi sphere?
In Sommerfeld theory for metals, after determining all of the possible levels for a single electron, one says that we build up a state for a system with $N$ electrons by filling up those levels, ...
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1answer
108 views
Electrical Resistance and chemistry
Can some one describe or explain what happens when too much current is passed through lets say a copper wire, I am looking for an explanation to do with physics and chemistry.
For instance we have ...
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1answer
289 views
Pull up and Pull down register
Currently I am working with Pull up and pull down registers and trying to understand what does it mean?
But could not able to understand. I searched in Wikipedia ...
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1answer
117 views
Is it possible to study solid state from kittel after taking only one course in quantum mechanics? [closed]
I have taken only QM I, which is the 1st half of Griffiths including the chapter on identical particles, will that be enough to understand Kittel's solid state?
Should one have also taken a course ...
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3answers
437 views
Indirect band gap semiconductor for LEDs?
Can someone please explain why Indirect band gap semiconductor can not be used for LED creation. Can you also please give me some reference link for details.
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1answer
42 views
UV-VIS spectrometer on Solids
I ran an experiment using translucent single crystal solids. I modified the solids along the way using different chemical/temperature environments. After every stage, I ran the samples through a ...
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1answer
50 views
Influence of the temperature on the ionization energies for impurities in silicon
Is there any dependence of the impurities ionization energy on temperature in silicon? I mean if there are any interactions between localized electron and phonons which leads to renormalization of ...
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1answer
119 views
Calculation of Number Density
Number density equation is given by
$ n= \dfrac{(N_A)\rho}{M} $
where
$ N_A =6.023\times10^{23} mol^{-1} $
$ \rho=8.02\ g/cm^3 $(at 1500 degree celsius.)
$M=63.546*1.6605\times10^{-24} g$
Whats ...
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200 views
How to determine real part of optical conductivity by reflectivity measurements?
In figure 3 of this document, there is data relating $\Re(\sigma(\omega))$ to the Fermi energy. It is claimed that $\Re(\sigma(\omega))$ is determined via reflectivity measurements. How is this done? ...
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99 views
Ways to experimentally control the chemical potential of a solid state system
When working in the grand canonical ensemble we write the grand potential as $\Omega = \Omega (T,V,\mu)$. In this case we are taking the chemical potential $\mu$ to be an independent variable. This ...
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89 views
Characteristics of bloch electron in a priodic potential
Effective mass of a Bloch electron in a periodic potential is negative why ?
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59 views
1D Acoustical Relations beyond nearest neighbor couplings
Consider some 1D Lattice of atoms with nth neighbor coupling of strength k_{n}. I'm looking for the dispersion relation for acoustical phonons under these conditions.
I start with the Lagrangian,
...
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407 views
How do I show that all Brillouin zones have the same volume?
I have read in a few books that all Brillouin zones have the same volume, and I can vaguely see how it works, but have not been able to think up a formal proof.
Help?
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175 views
Nonlinear absorption coefficient and the band gap
How does the nonlinear absorption coefficient depend on the band gap?
How can that coefficient be calculated theoretically? (Preferably with an example)
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14 views
Whether Au-Ga-Bi ternary phase diagram be calculated theoretically
Currently, my experiment involves the three elements: Au, Ga, Bi, and I need Au-Ga-Bi ternary phase diagram to explore the ...
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0answers
25 views
What are some applications of crystal fabrication? [closed]
I have heard of some applications here or there in certain papers, but I am looking for a broader scope of examples.
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0answers
10 views
use LPE mehtod instead of epitaxial in put graphene on silicon?
i want use LPE instead of epitaxial in put graphene on silicon can i do this work. here thickness of layer is nonsignificant.
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0answers
114 views
What is the condition for getting Bose-Einstein condensation? [closed]
Consider an ideal Bose gas in three dimension with energy-momentum relation E proportional to $p^s$ with $s>0$. Find the range of $s$ for which this system may undergo a Bose-Einstein ...
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0answers
46 views
Sommerfeld results & van Hove singularities
According to Sommerfeld the derivative of the density of states $g'(\varepsilon)$ apears in several thermodynamic quantities. Will this also be the case if one use the correct dispersion relation of ...
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0answers
96 views
Wave function ansatz for disclinated graphene with spin
I am currently investigating spin dynamics in disclinated graphene. More information about my approach can be found in my other post. I would like to know if my approach is somewhat correct to find ...
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0answers
111 views
Phonon Momentum
I am reading Charles Kittel's solid state physics and wondering what's the mechanism that neutron waves and photons can interact with phonons and the process obey the generalized momentum-energy ...
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0answers
70 views
How to find the translation vectors of a primitive cell when primitive cell encloses multiple atoms? [closed]
How to find the translation vectors of a primitive cell when primitive cell encloses multiple atoms?
Your help is appreciated!
Thank you!
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20 views
Rice Allnatt distribution function
Can anyone give me an article of which explains Rice Allnatt distribution function or can you explain the function here?
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1answer
66 views
How were the crystal lattices of elements determined to perfection ? (Ex:- That of a copper is a cubic lattice ) [duplicate]
Possible Duplicate:
How can crystal structures be determined using X-ray diffraction?
Are there any simple means in order to verify the nature of complex lattices like that of Triclinic , ...
