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36 votes

What is canonical momentum?

answered Nov 6, 2014 at 14:51

25 votes

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

answered Jun 22, 2015 at 7:32

17 votes

Accepted

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

answered Oct 17, 2014 at 8:47

11 votes

How is a bound state defined in quantum mechanics?

answered Oct 4, 2014 at 13:57

9 votes

Why does a superconductor obey particle-hole symmetry?

answered Jul 4, 2015 at 5:35

8 votes

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

answered Apr 5, 2014 at 9:25

7 votes

Accepted

Degeneracy in one dimension

answered Sep 22, 2014 at 1:54

7 votes

Perturbation theory with degeneracy even after 1st order

answered Dec 7, 2014 at 7:22

5 votes

Time reversal symmetry and real symmetric Hamiltonian matrix

answered Jun 25, 2015 at 12:55

4 votes

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

answered Nov 9, 2014 at 11:42

4 votes

Bloch's theorem

answered May 5, 2014 at 10:39

4 votes

Diagonalization of Hamiltonian

answered Apr 13, 2014 at 4:52

3 votes

Accepted

Bogoliubov transformation with a slight twist

answered Mar 12, 2014 at 1:21

3 votes

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

answered May 5, 2014 at 13:58

3 votes

A few questions on wave packets and uncertainty relations

answered Oct 2, 2014 at 9:21

3 votes

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

answered Oct 3, 2014 at 6:38

3 votes

Accepted

Interaction pictures of Quantum Mechanics

answered Oct 24, 2014 at 7:06

3 votes

Accepted

Sum over momentum states

answered Jan 19, 2015 at 11:57

2 votes

Accepted

$T$-invariant Hamiltonians

answered May 11, 2015 at 14:49

2 votes

How to measure the diameter of an electrical wire

answered Jun 24, 2015 at 13:10

2 votes

Accepted

How to write BdG Hamiltonian in graphene?

answered Apr 2, 2016 at 2:09

2 votes

Why did I get this dynamics question wrong?

answered Oct 4, 2014 at 15:35

2 votes

Landau level degeneracy in symmetry gauge, finite system

answered Nov 9, 2014 at 9:02

2 votes

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

answered Apr 11, 2014 at 4:26

2 votes

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

answered Apr 23, 2014 at 3:17

2 votes

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

answered Apr 25, 2014 at 2:40

1 vote

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

answered Apr 30, 2014 at 15:00

1 vote

Calculating the Probability Current of a Travelling Wave

answered Apr 3, 2014 at 16:02

1 vote

If the net force on a current loop in a magnetic field is zero, why is torque independent of choice of origin?

answered Apr 10, 2014 at 14:20

1 vote

Do stationary states with higher energy necessarily have higher position-momentum uncertainty?

answered Sep 26, 2014 at 5:04

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38 Answers

What is canonical momentum?

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

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

How is a bound state defined in quantum mechanics?

Why does a superconductor obey particle-hole symmetry?

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

Degeneracy in one dimension

Perturbation theory with degeneracy even after 1st order

Time reversal symmetry and real symmetric Hamiltonian matrix

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

Bloch's theorem

Diagonalization of Hamiltonian

Bogoliubov transformation with a slight twist

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

A few questions on wave packets and uncertainty relations

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

Interaction pictures of Quantum Mechanics

Sum over momentum states

$T$-invariant Hamiltonians

How to measure the diameter of an electrical wire

How to write BdG Hamiltonian in graphene?

Why did I get this dynamics question wrong?

Landau level degeneracy in symmetry gauge, finite system

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

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

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

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

Calculating the Probability Current of a Travelling Wave

If the net force on a current loop in a magnetic field is zero, why is torque independent of choice of origin?

Do stationary states with higher energy necessarily have higher position-momentum uncertainty?