Fermi Definition and 384 Threads

please help me solve this... fermi energy of copper is 7eV. what is the fermi momentum of an electron in copper? what is the de Broglie wavelength of the electron? what is the fermi velocity?/// please help/////:cry:

http://www.ph.utexas.edu/~schwitte/PHY362L/QMnote.pdf I thought the attached was a nice tutorial on Fermi Golden Rule. f

Homework Statement I just want to clear this up, I am a little confused: when an electric field is applied there is a force on the electron K-states thus displacing the fermi surface/sphere Is the relaxation time ( \tau)= lifetime of fermi sphere displacement or is lifetime of...

Just how strong did the explosion have to be to rock a 20 ton magnet from its base? ...and who foots the bill for the call out? Maybe they got what they were looking for but on a smaller scale. http://www.timesonline.co.uk/tol/news/uk/article1626728.ece"

I understand the principle behind p and n type doping, but I don't understand how such a small amount, 1ppm, can cause such a massive change in the fermi energy. as I understand it: for the intrinsic case the number of electrons exactly matches the number of holes and the fermi energy...

In metal, fermi energy is the highest energy states that electron occupied at T=0. And so, fermi energy of a particular metal is an intrinsic value, and won't be changed. Then for a semiconductor, What is fermi energy, is there any concrete interpretation as of metal? Why is it just in the...

Hey! When we say that the fermi energy of a certain metal is for example 2 eV what are the 2 eV measure relative to? The top of the valence band? If so, wouldn't the fermi energy of a semiconductor at 0 K be 0 eV? Thanks

Although I have some major conceptual problems with the Fermi gas as treated in my solid state physics notes (see this thread: https://www.physicsforums.com/showthread.php?t=161222, I have attempted to solve this homework problem in an analogous manner to the solution for the 3D Fermi gas given...

Hi, I have a question about the discussion of the free-electron (Fermi) gas in my solid-state physics notes. In the free electron model, you basically have particles in a box, and the state of any particle is described by four quantum numbers, nx, ny, nz, and ms, the spin magnetic quantum...

What is the best textbook or article that really indepth explains the fermi theory, including derivation of the fermi golden rule and a good discussion of fermi functions? Most nuclear physics textbooks I have looked through seems to skim over the details :frown:

Homework Statement Calculate T(fermi), the fermi temperature for a) Liquid 3He (density 81kg/m^3) [these are not electrons] b) neutrons in a neutron star (density 10^17 kg/m^3) Homework Equations n, number density = z*Na*p / M (Na=avogadro, z=valence,p=density,M=molecular...

Why is it that when no voltage is applied across the pn junction, the fermi energy is the same for both regions?

Can someone explain to me why the ground state energy of a free electron fermi gas is not just: E = 2 \int_0^{k_f} \frac{\hbar^2 k^2}{2m} 3k^2 dk Where the factor of two is due to the fact that there are two electron states for each value of k. The idea is to add up all the energies of...

This site has compiled the topology of fermi surfaces for a lot of material. http://www.phys.ufl.edu/fermisurface/ The Science website and the contact e-mail at the end indicate that the people who are responsible for this are at Ohio State (Gokul, do you know any of them?), but it is...

I am detaching this from the "All the lepton masses..." because there are not leptons anymore, and it is sort of Gravity plus Beyond Standard Model. First let me to put some square roots under the carpet by redefining \hat m_{top} \equiv \sqrt 2 \; m_{top} \hat G_F \equiv \sqrt 2 \; G_F...

we have non relativistic electrons at absolute zero. we need to show that the total energy is 3N*Ef/5 where Ef is the Fermi energy. this calculation I can do. we then need to show that the Pressure is equal to 2U/3V where U is the total energy. I did this by noting the dU=TdS - PdV and at...

Okay, so I've been asked to calculate the Fermi energy of n 2D free particles of mass m, given that the density of states does not depend on energy i.e N(e) = D for E>0. Now I know that the general recipe for this is: n = \int{N(E).dE} = \int{D.dE} = DE So that the energy is E =...

Hi do u know anything about fermi zones? I need some good articles to read about...

Is there a proof for Fermi and Bose statistics? What is the background of this proof? To what extent it is mathematically strict? Can one prove that no other statistics is posible?

I am trying to calculate the fermi energy for magnesium assuming two free electrons...I need to figure out N/V, the number density of conduction electrons in magnesium, then I can just plug into u = (h^2/8m)*(3N/piV)^(3/2) ... right?? So if this is correct my question is how do I find N/V..I...

What is fermi surface nesting? I don't have a hard reference, but I've heard this term thrown around quite a bit lately when talking about SDW, CDW, and SC.

I have a homework problem that asks me to interpret the two curves for when the Fermi level (Ef) is 0.25 eV. I ploted the two graphs and both of them look nothing alike when E < Ef. But both plots predict a probability of essentially zero when E > Ef. I was wondering why is there such a large...

This is sort of a simple question. In a steady-state semiconductor doped n-type, is it possible for the quasi-Fermi level for the holes (F sub p) to be above the intrinsic level for the conductor (E sub i)? That is, E - F = (negative value)?

Have been set a rather tricky question in physics, and wondered if you had any ideas on how I would go about answering it... It is based on Fermi style estimation to try and encourage one to estimate and guess, the question is... 'How many particles of ionising radiation pass through your head...

Hi, Hope somebody can help - I seem to be missing the obvious and bonking my head on the wall. In Wong and also in Feshbach/deShalit, they calculate the Fermi momentum, Kf using the experimental value of Rho-0 and come up with Kf=1.3 fm-1 So far so good. Where I stumble is in...

I'm following the derivation of Fermi coordinates in MTW, section 13.6. Equation 13.60 states \mathbf{\nabla_ue}_{\hat{\alpha}} = -\mathbf{\Omega\cdot e}_{\hat{\alpha}} where \Omega^{\mu\nu} is antisymmetric (and \hat{\alpha} is the tetrad label). My question is, over which index is the...

Ok, so here's the basic idea. You have a refrigerator, with four walls each 6ft x 2ft x 4in. The walls are made out of copper(high thermal conductivity), with a silicon chip at the center. This chip is connected to an inductor and is essentially a L-C oscillating circuit. As the chip heats up...

Fermi Contact Interaction of Electrons with Nuclei About this interaction, is it the spins of nuclei which interact with the spins of electrons? So, if I draw the magnetic field line from the left nucleus via the pair of e- to the right nucleus and there is not anti-parallel field against...

Hello there fellow physicist, Well for my A2 investigation I have done Thermocouples. I investigated the potential difference produced by different metal combinations. Now I need a hypothesis of some sort. What property of a metal will influence the potential difference produced by a...

Hey, guys, what's a fermi level?

Fermi Numbers!?? I'm trying to solve this problem and explain all my steps in my reasoning. **HOW MANY HAIRS ARE ON YOUR HEAD?** If anyone can help me figure this out, reply thanking u in advance faiza

I have difficulty about Fermi Electron.I almost don't understand what it is.Everybody,Plzz,help me about that Thanks a lot :biggrin:

Has anyone ever been to Fermi Lab near Chicago? I was wondering about it, because I read about it in a book talking about particle accelerators.

After reading "Hyperspace" by Kaku, I was slightly puzzled after his chapter on collapsing stars. He states that white dwarfs and neutron stars remain stable, because the exclusion principle counter-acts the gravitational collapse. He then sais the stars who have reached the end of the...