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location Santa Barbara, CA
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I am a postdoc at Kavli Institute for Theoretical Physics, University of California, Santa Barbara. My major is in condensed matter physics.


Oct
22
revised How to see the ground state degeneracy (GSD) from a $BF$ theory in $2+1$ $d$?
improved formatting and fixed typo
Oct
22
answered How to see the ground state degeneracy (GSD) from a $BF$ theory in $2+1$ $d$?
Oct
22
revised Differentiating the Hamiltonian Operator, $\hat{H}$
correct the Dirac Hamiltonian
Oct
22
answered Differentiating the Hamiltonian Operator, $\hat{H}$
Oct
22
reviewed Approve suggested edit on What is the physical meaning of retarded time?
Oct
20
awarded  Necromancer
Oct
8
revised Why does the weak force distinguish left and right handedness?
edited tags
Oct
8
answered Is a gapless system always conducting and a gapped system insulating?
Oct
8
reviewed Approve suggested edit on Instantaneous axis of rotation and rolling cone motion
Sep
30
awarded  Explainer
Sep
29
answered Why is $\hat{p} \circ \hat{p}$ the operator corresponding to $p^2$?
Sep
27
revised Why are most ferromagnets metals while antiferromagnets are insulators?
deleted 1 character in body
Sep
27
revised Why are most ferromagnets metals while antiferromagnets are insulators?
add a figure of superexchange
Sep
27
comment Why are most ferromagnets metals while antiferromagnets are insulators?
@Jonas Your model assumes perfect nesting and fully gapped SDW, which generally not true. In nature, there are many SDW metals, like the parent compounds of iron-based superconductors (e.g. $\text{BaFe}_2\text{As}_2$). So it is not always true that "AFM gives rise to a band gap while FM does not".
Sep
27
answered Why are most ferromagnets metals while antiferromagnets are insulators?
Sep
26
comment Projection Method in Hubbard model
@SlipStream Second order means the electron is only allowed to hop twice. For the first t, the electron hops to one nearest site, and for the second t, the electron has no choice but to hop back to its original site, otherwise the electron will not end up with the single occupied configuration, and hence not contributing to the low-energy theory. So this only involves two sites.
Sep
25
comment Projection Method in Hubbard model
@SlipStream Yes, but to the second order perturbation in (t/U), one only need to consider two sites. All the electrons on the other sites are just by-standing and do nothing.
Sep
24
awarded  Autobiographer
Sep
24
answered Projection Method in Hubbard model
Sep
22
awarded  Popular Question