Physics Questions, Problems & Solutions : TransWikia.com ~ Page 273

Help with diagonalizing a BdG Hamiltonian

I am working on a simulation which diagonalizes a BdG Hamiltonian; let's start with one of the form: $$hat{H}=-tsum_{<r,r'>,sigma}hat{c}^dagger_{rsigma}hat{c}_{r'sigma}+sum_{r}Big(Delta_o c^dagger_{r+}c^dagger_{r-}+h.c.Big)$$So a uniform s-wave superconductor with a nearest neighbor...

Asked on 06/09/2021 by scruby

1 answer

Calculating the Wigner transform of operators

Recently I started to study the formulation of quantum mechanics in the phase space. So I was introduced to the concept of Wigner function and Weyl transform.I learned that...

Asked on 06/09/2021 by Wagner Coelho

1 answer

Calculation of time for electronic transitions

How do we determine the time for electronic transitions in atoms or in semiconductor devices, from one energy level to another?...

Asked on 06/09/2021 by Rishi Sharma

3 answer

Evolution of Delta Function in Free Particle Hamiltonian

I was curious what would happen if we had a free particle hamiltonian and saw what would happen if your initial wavefunction was a delta function and time evolve it...

Asked on 06/09/2021

1 answer

Different charges of plates of parallel plate capacitor

Suppose the plates of a parallel plate capacitor have charges +2Q and -Q initially. Then if they are connected with a battery of emf V what will be the charge...

Asked on 06/09/2021 by Neelesh Vij

2 answer

What is the diff in operational range underwater between a dipole trimmed to resonate @2.45GHz versus a dipole tuned to resonate using a pi network?

(Sorry about the use of "diff", but I needed the characters.)In air, a half-wave dipole can be physically trimmed to resonance and will radiate well.It can also be...

Asked on 06/09/2021 by Jay Zebryk

2 answer

Lorentz generators $J_i,K_i$ and Casimir invariants in bispinor representation

Lorentz generators satisfy the Lie algebra $$[J_i,J_j]=iepsilon_{ij}^kJ_k, ~~~~[J_i,K_j]=iepsilon_{ij}^kK_k, ~~~~[K_i,K_j]=-iepsilon_{ij}^kJ_k.$$ Now, define $$A_i=frac{J_i+iK_i}{2},~~~~B_i=frac{J_i-iK_i}{2},$$ and we can easily prove that$$[A_i,A_j]=iepsilon_{ij}^kA_k, ,[B_i,B_j]=iepsilon_{ij}^kB_k, ,[A_i,B_j]=0.$$ We also see that the ...

Asked on 06/09/2021 by user286848

1 answer

Extremum principle for gradient wind balance

Dear Physics StackExchange, as is well known, analytic solutions of the Navier-Stokes equations are only available for very special flows. Therefore, in most fields concerned with fluid dynamics, a lot...

Asked on 06/09/2021 by Cyclone

1 answer

Does the rotating space skyhook allow for a periodic motion?

Take a look at the relevant wikipedia-page to get accustomed to the concept of the skyhook. My question is whether it is possible to distribute the mass...

Asked on 06/08/2021 by Thibaut Demaerel

0 answer

Work done by the gas in free expansion

I am a high school student and I am a little confused in a free expansion of gas, My teacher told me that when an ideal gas expands adiabetically against...

Asked on 06/08/2021

2 answer

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