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I'm an experimental condensed matter physicist, but I'm very curious about high energy physics as well.


Apr
29
revised Would HgTe be a topological insulator?
added 11 characters in body
Apr
29
accepted Physical Interpretation of the Integrand of the Feynman Path Integral
Apr
26
comment Would HgTe be a topological insulator?
Wow excellent! This clears up a lot of confusion. I'll keep thinking about this. One question though: why can we ignore inversion asymmetry near the $\Gamma$ point?
Apr
26
revised Would HgTe be a topological insulator?
added 4 characters in body
Apr
26
accepted Would HgTe be a topological insulator?
Apr
25
asked Would HgTe be a topological insulator?
Apr
15
comment Physical Interpretation of the Integrand of the Feynman Path Integral
Ah! I forgot about the factor hidden in the measure! Does that mean that the modulus of the weight of each path is equal and the only difference between each path is the phase?
Apr
15
asked Physical Interpretation of the Integrand of the Feynman Path Integral
Apr
15
comment What is the meaning of the Fourier transform of Feynman propagator?
What is the physical interpretation of the propagator as a function of $E$ and $p$?
Apr
12
accepted Given expectation values for E and B, can you find an associated state?
Apr
12
comment Given expectation values for E and B, can you find an associated state?
Thanks! That was helpful. I should read a book on Quantum Optics.
Apr
10
comment Given expectation values for E and B, can you find an associated state?
Interesting! Upvote! I was looking for a closed form for the state that produces a specific $\vec{E}$ and $\vec{B}$, but if it's not unique... How do you physically interpret the statement that having a definite number of photons results in $\langle \vec{E} \rangle = \langle \vec{B} \rangle =0$? And what quantum state corresponds to what we would call a "uniform electric field"?
Apr
8
asked Given expectation values for E and B, can you find an associated state?
Apr
8
awarded  Critic
Apr
8
revised Is there a physical reason for level repulsion and avoided crossings?
added 45 characters in body
Apr
8
awarded  Editor
Apr
8
revised Is there a physical reason for level repulsion and avoided crossings?
added 245 characters in body
Apr
8
comment Is there a physical reason for level repulsion and avoided crossings?
@Qmechanic Actually, the question you linked is what inspired my question. Perhaps I should have added more detail in my question, but I was thinking Adiabatic Theorem, not perturbation theory. I will edit my question correspondingly.
Apr
8
asked Is there a physical reason for level repulsion and avoided crossings?
Mar
30
comment Why is the second order perturbative correction to the ground state energy always down?
For explanation IV), couldn't you invert the argument, pretending that you knew the eigenstates of the full Hamiltonian $H=H^{(0)}+V$ and treat $H^{(0)}=H-V$ perturbatively, and conclude that the eigenvalues of $H^{(0)}$ are more spread out that for $H$?