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36 votes

What is canonical momentum?

24 votes

What role does "spontaneous symmetry breaking" play in the "Higgs Mechanism"?

17 votes
Accepted

Why don't free electrons fall from metals if shaken?

11 votes

How is a bound state defined in quantum mechanics?

9 votes

Why does a superconductor obey particle-hole symmetry?

8 votes

Perturbation theory with degeneracy even after 1st order

8 votes

Correct way to write the eigenvector of a diagonalized hamiltonian in second quantization

7 votes
Accepted

Degeneracy in one dimension

5 votes

Time reversal symmetry and real symmetric Hamiltonian matrix

4 votes

Bloch's theorem

4 votes

Diagonalization of Hamiltonian

4 votes

How does current flow in superconductors if Cooper pairs have zero momentum?

3 votes
Accepted

Interaction pictures of Quantum Mechanics

3 votes
Accepted

Sum over momentum states

3 votes
Accepted

Bogoliubov transformation with a slight twist

3 votes

Why does the n=0 Landau level in graphene have half the degeneracy of the other levels?

3 votes

A few questions on wave packets and uncertainty relations

3 votes

How do we find the canonical ensemble density matrix for two spins?

2 votes

In calculating work done by a constant force over a constant distance, why doesn't the subject's initial velocity matter?

2 votes

Proving a step in this field-theoretic derivation of the Bogoliubov de Gennes (BdG) equations

2 votes

Why does the Fermi Surface cross the Brillouin zone boundary at right angles?

2 votes
Accepted

$T$-invariant Hamiltonians

2 votes

How to measure the diameter of an electrical wire

2 votes
Accepted

How to write BdG Hamiltonian in graphene?

2 votes

Why did I get this dynamics question wrong?

2 votes

Landau level degeneracy in symmetry gauge, finite system

1 vote

Does tunneling transmission probability depend on the density of states or velocity?

1 vote
Accepted

Why do Weyl points come in pairs in solid state system?

1 vote

Why does ice melting not change the water level in a container?

1 vote

Calculating the Probability Current of a Travelling Wave