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seen Jul 27 at 19:16

I'm a graduate student at Department of Physics & Astronomy, Louisiana State University.


Jul
27
comment Optical Bloch Oscillation
I don't know about optical Bloch oscillation, but Bloch oscillation in general can be understand in these two pictures: the Bloch oscillation and Wannier-Stark pictures. These two pictures corresponding two independent choices of gauges, the velocity gauge and the length gauge. In the Bloch oscillation picture, the eigenfunctions of the system are the Houston states (accelerated Bloch states). In the Wannier-Stark picture, the eigenfunctions are the Wannier-Stark states, and the Bloch oscillation can be understand as the quantum beating of a superposition of two eigenstates of the system.
Jul
23
awarded  Good Question
Jun
9
comment Particle in a box under harmonic driving
Thanks, but I'm interested in exactly the non-perturbative limit, where the Rabi oscillation can happen.
Jun
9
asked Particle in a box under harmonic driving
Apr
7
comment Adjoint of momentum operator
The adjoin of the differential operator $\nabla^\dagger = -\nabla$ can be proved by integration by part.
Mar
6
awarded  Informed
Mar
6
comment The gauge-invariance of the probability current
Great prove ! +1
Mar
6
asked group velocity VS probability current
Dec
20
awarded  Yearling
Nov
30
awarded  Scholar
Nov
30
accepted Why are rockets so big?
Nov
28
awarded  Popular Question
Nov
28
awarded  Nice Question
Nov
28
asked Why are rockets so big?
Oct
4
comment What is mean by 'good quantum number' in spectroscopy?
If $[H,A]\neq0$ then the $A$ (e.g. angular momentum) is not good quantum number. This means if you have a state with specific energy, and you measure the angular momentum, you will get different values.
May
31
awarded  Citizen Patrol
May
21
awarded  Editor
Apr
14
awarded  Student
Apr
14
asked Analytical solution of two level system driving by a sinusoidal potential beyond rotating wave approximation
Apr
14
answered Stark effect in two level atomic, laser-driven system?