Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:41 AM
ZapperZ

1 
20,742 
Hi,
Could anyone explain how the affect that PN junction depth has on the performance of a semiconductor device?...

Apr1714 03:00 PM
mmaarrkk

0 
98 
For arbitrary Fermionic self energy, \Sigma(i wn) with wn=(2n+1)pi T, its real part is always an even function of wn...

Apr1614 11:46 AM
bsmile

0 
132 
Question statement: We are given that Ca and CaF2 are both Ca facecentred cubic lattices, and that in the case of...

Apr1614 11:54 PM
nasu

1 
149 
I knowbecause of Noether's theoremthat continuous rotational symmetry implies conservation of angular momentum,...

Apr1714 03:03 PM
DrDu

1 
151 
If ptype semiconductor and ntype semiconductor of a diode are equally doped, and if the diode is forward biased,...

Apr914 01:22 PM
M.Kalai vanan

0 
153 
How would react ion of some gas (low energy anion or cation) in vicinity of a grounded metal surface or in vicinity of...

Apr1014 03:00 AM
mr.smith

0 
184 
Hi, I am looking for an introduction to heat capacity measurements at low temperature (10K). (For example for...

Apr914 12:10 PM
kuecken

0 
185 
Hello all,
I'd truly appreciate if you could provide me with guidance on this. I'm trying to find the electric...

Apr914 11:51 AM
npathmat

0 
186 
Published values for the room temperature thermal conductivity of graphene vary from ~2000 W/m*k to 5600 W/m*k, for...

Apr1114 10:59 AM
christopher.s

0 
193 
Hello All!
I was wondering if anyone can tell me if or if not the wavefunctions used to construct the electron...

Apr1514 10:17 PM
sidiq

2 
195 
I read this:
I don't see why the electron spin affected the number of lines to go up in some atoms and not in...

Apr1414 09:02 AM
DrClaude

1 
202 
Hi.
According to this page and other sources I found the zcomponent of the electronic magnetic moment is greater...

Apr1314 03:45 AM
mfb

3 
209 
When we connect P and N materials, electrons from N drift to P, thus create negative ions in P and positive ions in N....

Apr1314 05:18 AM
Goodver

2 
212 
Problem statement:
The Bragg angles of a certain reﬂection from copper is 47.75◦ at 20◦C but is 46.60◦ at 1000◦C....

Apr914 01:26 PM
nasu

1 
232 
I cannot wrap my head around this stuff. Sorry if long post.
I understand that emission lines come from a higher...

Apr814 03:23 AM
Zarqon

1 
237 
I'm supposed to give a seminar tomorrow for my 300 level experimental physics paper. The experiments we do our reports...

Apr1414 02:49 AM
cooev769

9 
242 
http://www.supraconductivite.fr/media/images/pages/image012.gif
In the above picture it is clear that the...

Apr1214 09:11 AM
paulzhen

4 
245 
Phonons are said to be the result of the quantization of crystal waves.Let the function u=u_0...

Apr1014 06:46 AM
Zarqon

1 
251 
Hello,
I see a Hamiltonian of spinorbit coupling, it is like this
H=\frac{1}{2m} \sum_{\alpha} \left( \left(...

Apr1414 09:13 PM
Tianyou

4 
257 
Does atoms in a crystal have energy states like electronic states? it is according to Einstein relation for harmonic...

Apr714 11:55 PM
jlopezfis

1 
278 
I am reading a paper about Random Graph Theory and Percolation theory and it keeps talking about infinite clusters and...

Apr414 11:06 AM
joshthekid

0 
287 
Hello,
Are the electrons at the fermi level regarded as the "free electrons" of the metal?
Also, how does one go...

Apr1514 12:32 AM
Simon Bridge

4 
293 
Hello Guys!
I have been studying electromagnetic waves (EMW) interaction with matter lately and I just derived the...

Apr914 01:38 PM
nasu

3 
303 
On the attached file the tight binding dispersion for a 2d square lattice is described. It is then assumed that the...

Mar3014 08:58 AM
aaaa202

0 
309 
Does Janak's Theorem predicts Ionization energies better than it predicts Electron Affinities, similar to Koopman's...

Mar3014 12:07 PM
supw

0 
326 
Hi, I have problems with the following:
Number of modes for a 2d crystal with one atom per primittive unit cell.
...

Apr514 01:56 PM
DrDu

1 
350 
How exactly does superfluidity occur in helium 3? I have heard that the nuclei of the helium atoms form pairs...

Mar3014 12:48 PM
lizzie96

0 
359 
I've tried searching for it but while there are a lot of hits on the fact that graphene's conductivity is high, there...

Mar3014 07:28 PM
Simon Bridge

3 
364 
What is "thermal rounding"

Nov2113 06:41 AM
fizikbrat

0 
380 
Hi,
could someone direct me or recommend me some materials which deal with those problems?
I would like to get...

Mar2314 08:50 AM
ZapperZ

1 
381 
What is the significance/physical interpretation of Fractional Occupation Numbers in DFT?

Apr714 02:35 PM
Useful nucleus

5 
415 
Referring to the following journal by R. Hao et. al., J. Cryst. Growth, 337, 81, (2011):
From this sentence, a...

Jan2114 09:50 PM
maxxlr8

0 
423 
Hi
If we fabricate a heterojunction from TiO and lead phthalocyanine (PbPc is an organic semiconductor) by thermal...

Nov2813 03:27 AM
r.sahebi

0 
427 
The surface photovoltage effect suggests that the potential at the surface of a semiconductor will change when it is...

Jan2114 02:51 PM
arrektor

0 
429 
what do you mean by density of states ? can you please explain to it ?

Nov2113 09:59 AM
adjacent

1 
434 
Hi,
I have some Raman peaks and I know what their descriptions are. Some of them are symmetric dimer, some of them...

Oct713 08:14 AM
yokone

0 
439 
What would be a good Internet link that would properly explain Fermi Energy or (Fermi Level)? How does the Fermi...

Feb114 02:31 PM
mc^2

0 
440 
How is it exactly i convert between a kspace sum an integral?
Assume that we have some macroscopic solid. Periodic...

Apr314 02:50 PM
DrDu

2 
442 
Why"for small or stiff systems the dynamics is not ergodic"?
For small system, the fluctuation of total energy...

Feb1413 08:55 AM
jiadong

0 
445 
Supposing that some solid can exist at 2 different phases (had 2 different crystalline structure) at some temperature...

Mar2314 04:31 PM
DrDu

6 
445 