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If you are seeking help with a...

Feb2313 08:41 AM
ZapperZ

1 
25,760 
The surface photovoltage effect suggests that the potential at the surface of a semiconductor will change when it is...

May2914 11:31 PM
rigetFrog

1 
796 
In Bragg’s spectrometer used to determine the wavelength of X – rays why should we make use of only NaCl crystal,cant...

Feb514 05:48 AM
M Quack

1 
742 
I can't derive it properly even though it should be easy:
From Newtons 2nd law:
m dv/dt = eE
=>
v(t) =...

May2914 11:21 PM
rigetFrog

1 
1,017 
Anyone know how hydrogen bonding in water can enhance "density fluctuation" ?
And in first place What is "density...

Feb1214 03:14 AM
DrClaude

1 
917 
I want to use the ray tracing software ZEMAX to calculate reflection and absorption using thin metal oxide coatings on...

May2914 11:19 PM
rigetFrog

1 
988 
I am bit confused by how to approach this concept with mean field theory. As I understand a symmetry break (like a...

Feb1114 12:48 AM
DrDu

1 
756 
Hello all,
I have been learning to use FDTD to model light interaction with various materials. I've successfully...

Feb1214 01:16 AM
DrDu

1 
858 
I've just begun to study spectroscopy, and I need a clarification about the Doppler Effect.
Consider a cell...

May2914 11:17 PM
rigetFrog

1 
977 
I think most of you are familiar with this model (sum runs over nearest neighbours):
H = J ∑S_iz * S_jz
It...

Feb1414 05:43 PM
Hypersphere

1 
790 
Hey all,
I was studying stimulated emission in lasers and I had a doubt regarding the same.
When the electron...

Feb1514 08:13 AM
Simon Bridge

1 
951 
I have a molecular dynamics code and I want to model the reaction of O with Mg to form MgO at arbitrary temperatures. ...

Feb2014 07:38 PM
Useful nucleus

1 
851 
Hi All,
Greetings!
I have a 3d material and I use result from first principal for getting the potential...

Feb1914 12:41 PM
cgk

1 
787 
I'm supposed to be working with an STM in the coming weeks to determining the Fermi Level of some semiconductor...

Feb2314 03:34 PM
ZapperZ

1 
831 
Should I use Quantum ESPRESSO or Material Studio?
I want to compute some properties in Material

Mar1514 03:19 AM
tshuxun

1 
797 
Hi all
Can someone please describe how the form factor used in Rutherford scattering is applicable to neutron...

Mar2214 03:41 AM
M Quack

1 
595 
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 
550 
Hi all,
could you suggest me references that can help me in the following calculation?
I would like to see how to...

Mar2614 02:28 AM
DrDu

1 
647 
Below is part of derivation of the boltzmann equation in an electric and magnetic field.
I don't understand how to...

May2914 11:13 PM
rigetFrog

1 
886 
Suppose you have a body floating in a rotating superfluid. Maybe a speck of dust. Would it rotate?
What if you...

May614 07:10 PM
Greg Bernhardt

1 
542 
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 
540 
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 
477 
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 
463 
Hi, I am looking for an introduction to heat capacity measurements at low temperature (10K). (For example for...

May2914 10:56 PM
rigetFrog

1 
658 
How would react ion of some gas (low energy anion or cation) in vicinity of a grounded metal surface or in vicinity of...

May914 02:19 PM
mr.smith

1 
755 
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 
516 
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 
529 
Hi,
Could anyone explain how the affect that PN junction depth has on the performance of a semiconductor device?...

Apr2014 12:20 PM
M Quack

1 
525 
Hello,
I'm currently writing a chemistry program. The user can create any kind of atom he can imagine, and then...

Apr1914 09:04 PM
SteamKing

1 
536 
Hi all
I was trying to understand the BornBethe approximation related to cross sections for atomic and molecular...

May414 10:46 PM
Greg Bernhardt

1 
623 
hello everyone..
1) what is the magnetic properties for indium oxide? i hope that it has ferrimagnetic properties...

Apr2414 10:39 AM
UltrafastPED

1 
434 
Hi,
I am numerically solving the 2D effectivemass Schrodinger equation
\nabla \cdot (\frac{\hbar^2}{2} c...

May614 11:48 PM
Greg Bernhardt

1 
546 
I know that at early stage (around 1999), GW implementation uses Matusbara frequency to help calculating self energy,...

May2714 02:03 PM
Greg Bernhardt

1 
635 
Hi,
I've been reading about critical exponents and how they're related in any system. I've seen how, for example,...

May1314 01:36 PM
Timo

1 
597 
I am reading a book about the interaction between atom and photon. I don't understand the following statement:
"for...

May1314 03:38 AM
Zarqon

1 
554 
I am learning Ashcroft's Solid State Physics. In the Electrons in a Weak Periodic Potential, I got some problems.
...

May1314 10:47 PM
Simon Bridge

1 
567 
Orthogonal plane waves can be used to expand Bloch waves. It is better than plane waves because it converges more...

May1814 09:49 AM
bsmile

1 
501 
I know one can find the "near field" length of an illuminated diffraction grating by calculating the Talbot Length,...

May1614 11:18 AM
Claude Bile

1 
526 
In the following http://electrons.wikidot.com/solarcells
it mentioned that
how and when nside becomes positive?

Jun1414 05:34 PM
Greg Bernhardt

1 
1,148 
Thinking back to my undergraduate years in Chemistry 101, it always struck me as strange that mercury, a transition...

Jun1414 07:05 PM
SteamKing

1 
933 
Hi everyone,
I am working with a solar cell realized with a metalsemiconductor junction. I need to find an...

Jun2514 10:07 AM
UltrafastPED

1 
1,494 