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Atomic, Solid State, Comp. Physics

- Exp. & theo. methods for atoms, molecules, condensed matter
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:41 AM
ZapperZ
1 26,191
I want to know ... what happens to silicon when some impurity is added to it. Where does silicon goes??
Nov9-13 10:55 AM
phyzguy
6 1,000
So, I have a basic/general question here. I understand that, for example, the QED Langrangian has U(1) gauge symmetry....
Nov8-13 11:58 PM
dfttheory
1 664
For a nonmetal what determines thermal conductivity is the propagation of lattice vibrations. As T increases these...
Nov8-13 07:41 AM
DrDu
3 782
I've seen these things for sale on the web. http://www.amasci.com/neodemo.htmlhttp://www.kjmagnetics.com/safety.asp...
Nov7-13 02:13 AM
sinromagnet
6 3,255
I am interested in the following scenario. Suppose that you have a composite system, e.g. ion, atom or whatever...
Nov5-13 03:46 PM
mfb
3 735
Why energy level is higher on p side of pn junction diode as compare to n side of same
Nov5-13 10:49 AM
physics.cie
4 990
Ashcroft & Mermin, Solid State Physics, page 315: "According to the Bloch theory, an electron in a perfectly periodic...
Nov5-13 09:48 AM
UltrafastPED
3 863
As far as I understand: In the Drude model we take the electron to be moving in a random direction after each...
Nov5-13 06:45 AM
UltrafastPED
3 980
Semiconductors is said to be energy bands where they are many quantum states the electrons can have. What other...
Nov4-13 04:27 PM
kye
0 715
Does this construction even make sense? By definition it is a surface of constant energy in k-space, so for the free...
Nov4-13 04:16 PM
mfb
1 1,026
One line between (+-). Two lines between (++). Zero line between (--). \gamma number of nearest neighbours. Why we...
Nov4-13 08:06 AM
1ndranil
1 1,797
In the harmonic approximation, why is the volume of a crystal not temperature dependent? Does it have something to do...
Nov3-13 01:18 PM
DrDu
1 799
Just one short question about something I didn't understand in my book: "At low temperaturs only vibration modes where...
Nov3-13 01:16 PM
DrDu
1 724
I read an article that anion vacancy act as a 'hole-killer' which prevents p-type doping. I couldn't understand...
Nov3-13 09:11 AM
Useful nucleus
1 599
Good day, I was recently asked to look into the process of thermal annealing of thin metal films in order to induce...
Nov3-13 07:33 AM
Verdict
1 651
Phonons are quantized lattice vibrations. They are travelling waves of the form exp(ikr) taken to satisfy periodic...
Nov2-13 02:04 PM
DrDu
7 1,101
I have this question on the calculation of the geometric phase (Berry phase) of a parallel transporting vector over...
Nov2-13 11:09 AM
fzero
1 826
Hi all, There are 2 points I do not get: 1. I read something saying that phonon is an energy packet of "heat...
Nov1-13 02:17 PM
DrDu
3 880
Why is the Fermi level a constant in thermal equilibrium? just like PN diode (P=material 1 ; N=material 2) the...
Nov1-13 09:23 AM
wantommy
0 946
This occur when two phonons interact and the sum of their momenta add to a new wavevector outside the new Brillioun...
Oct31-13 01:59 AM
DrDu
2 870
I was wondering why the valence electrons aren't free to move in insulators? Thanks for any help in advance.
Oct30-13 06:35 PM
hokhani
3 971
Hi all, I was wondering mathematically how stimulated emission works, could someone please explain it more concisely...
Oct30-13 01:33 AM
king vitamin
4 808
Dear PF, I'm trying to calculate the anisotropy constant of a ferromagnetic material. Then, of course, I need to...
Oct29-13 04:18 PM
Superposed_Cat
1 801
Can we apply the concept of phonons and Debye Model in case of amorphous and poly-crystalline solids?? ...
Oct29-13 03:03 PM
DrDu
4 1,806
When a transition from valence band to conduction band happens (in a direct-gap material), how the momentum is...
Oct29-13 10:35 AM
Cthugha
3 854
Say an electron tunnels from one state, through a tunneling barrier, to another state. Is the spin of that electron...
Oct26-13 09:37 AM
ZapperZ
2 1,074
I am reading the book "Lecture notes on Electron Correlation and Magnetism" by Patrik Fazekas. It says, "The...
Oct26-13 08:28 AM
sam12
0 918
How is the cell constant "d" related to the cell parameters? I know that for the smallest possible diffraction angle d...
Oct25-13 04:45 PM
UltrafastPED
1 784
I have done several exercises concering periodic potentials in crystal. Especially I did one, where I had to show that...
Oct25-13 01:32 AM
DrDu
3 1,080
For a free electron gas the procedure for determining the density of states is as follows. Apply periodic boundary...
Oct24-13 09:39 AM
nasu
4 979
I understand what nuclear binding energy is and its importance in nuclear weaponry an the fueling of stars, but why,...
Oct21-13 10:02 PM
Drakkith
6 1,271
Are there anybody doing some research on quasicrystals ,especially its mechanical property? I am just wondering why...
Oct20-13 10:11 PM
Timney
2 741
My book has a discussion of how the Bragg model can explain the origin of energy band gaps in solid. I have attached...
Oct19-13 05:19 PM
Simon Bridge
15 8,097
It is mentioned that in optical tweezers the dielectric particles are attracted to the gradient of the laser's...
Oct19-13 12:31 PM
pjbeierle
3 1,061
hello again physics forums. how will i be able to construct the band diagram of HEMT (and other types such as pHEMT...
Oct19-13 11:36 AM
lubin1
0 705
I know what is lattice constant but it has been given that nano particles have reduced lattice constant due to huge...
Oct19-13 10:47 AM
UltrafastPED
3 957
Can we apply the concept of phonons and Debye Model in case of amorphous and poly-crystalline solids?? ...
Oct19-13 08:26 AM
Claude Bile
3 1,906
Greetings everyone, I am confusing the definitions in the title of the post all the time. I have books about...
Oct19-13 08:10 AM
Claude Bile
3 1,838
Hi all, I use Transiesta package for DFT-NEGF nanoscale transport calculations. I wondered if there is a very very...
Oct18-13 12:00 AM
simsCity
0 922
Hello Physics Forums. Our professor asked us to do a program on constructing the band diagram of BCC and FCC for...
Oct17-13 02:34 PM
UltrafastPED
1 1,050

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