2,898 reputation
727
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location Santa Barbara, CA
age 28
visits member for 3 years, 3 months
seen 2 hours ago

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


11h
reviewed Approve reflection at intersection of two mirrors
11h
reviewed Approve Superfields and the Inconsistency of regularization by dimensional reduction
1d
reviewed Approve Do rainbows have ultraviolet bands and infrared bands?
1d
revised Chiral Fermion Problem and the String Net Model
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1d
answered Chiral Fermion Problem and the String Net Model
1d
reviewed Approve Explanation for different boiling points of water on different altitudes
May
19
revised Particle hole symmetry of single site?
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May
19
answered Particle hole symmetry of single site?
May
18
comment Can a symmetry-preserving unitary transformation that goes from a trivial SPT to a non-trivial SPT be local?
@Thomas The unitary transformation $U$ is local but not on-site. It is a product of operators over the simplexes (triangles), but not a product of operators on each site, therefore it fits in the rule 1. of Prof. Wen's answer above. Also be careful that $\nu_3(1,g_i,g_j,g_k)\to \nu_3(1,g g_i,g g_j,g g_k)$ is not a symmetric transformation of the cocycle, because $g$ only acts on the spacial simplex but not touching the first element $1$. So whether or not $U$ is symmetric is not obvious at the first glance.
May
16
reviewed Approve Problem with relativity of acceleration
May
13
reviewed Approve Point with zero electric potential inside triangle
May
13
reviewed Reject and Edit Position dependent refractive index
May
13
revised Position dependent refractive index
edited tags
May
13
reviewed Approve How to obtain a vector relation for the Rabi frequency?
May
13
awarded  Custodian
May
13
comment Convert kinetic energy of a bullet into electricity and store it in a super-capacitor
This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you have sufficient reputation you will be able to comment on any post.
May
13
reviewed Approve Why stay in the car during thunderstorms?
May
13
reviewed Approve Calculations on heat transfers
May
12
revised Is there a specific name for the highest energy state in quantum mechanics?
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May
11
comment Green's function for 1 D hubbard model?
@user48826 Yes, $|0000\rangle$ and $|1111\rangle$ states are irrelevant in this problem. A cleverer approach is to work only in the $N=1,2,3$ subspace. However the brute force method shown here is for the most general setting, which means it can easily deal with doping away from the half filling.