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reviewed Approve Capture the entire light field of a 3D scene and construct a virtual scene
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Jun
24
answered Phase transition without the Peierls' counter argument
Apr
27
comment Time Reversal Bulk Hamiltonian
The thing sandwiched between $\mathcal{T}$s in your last equation should've been $H_{2}(-k)$ (this is how you get a -k in the upper left value in your matrix! Otherwise the equality as written just isn't true.) and then it's trivially a special case of the first line.
Apr
10
comment On the Bogoliubov transformation in the BCS
You're on the right track, but notice that the RHS of the transformations contain no spin indices. So flipping the spin in the first expression doesn't mean anything. Inverting momentum is the only trick you've got.
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Oct
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answered What is the clear cut difference between isotropic and anisotropic spin exchanges?
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Aug
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answered Why is the Hubbard model written down so late?
Aug
24
comment Atomic nearest neighbor notation
It wouldn't make a damn lick of sense, but I have seen the notation NN, NNN, etc. referring to two-nucleon, three-nucleon, etc. interactions in an EFT context. Otherwise I've definitely seen both notations in condensed matter, with the NN,2NN,3NN,etc... notation being much more common.
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10
reviewed Approve Newton and the change of mass with time
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9
reviewed Approve What is the duration of a snap?