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bio website dao.mit.edu/~wen
location Waterloo, Canada
age 52
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I am a professor in condensed matter theory.

The "favorites" link below contains a list of questions that I gathered from physics.stackexchange. Please have a look.


Oct
16
revised Definition of short range entanglement
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Oct
10
awarded  Nice Answer
Oct
6
awarded  Nice Answer
Sep
23
awarded  Nice Answer
Sep
19
revised Definition of short range entanglement
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Sep
19
revised Definition of short range entanglement
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Sep
19
revised Definition of short range entanglement
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Sep
19
comment Explicit degeneracy in SPT phases
|det(K)| refer to the topological degeneracy on a torus. It has noting to do with the degeneracy on the boundary.
Sep
19
comment Explicit degeneracy in SPT phases
Yes, |det(K)| only refer to the topological degeneracy. Also In the case of explicit symmetry breaking, the degenerate eigenstates do not form a representation, in particular they do not form a singlet representation.
Sep
19
revised Definition of short range entanglement
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Sep
19
revised Definition of short range entanglement
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Sep
19
comment Is the Standard Model consistent (UV complete)?
By "the Standard Model is consistent in perturbative expansions" I mean that perturbative expansions up to a small fixed order is well defined. But it is known that the perturbative expansion does not converge (the radius of convergince is zero). At a finite order, although the perturbative expansions is well defined, the results do not conserve conserve probability.
Sep
19
revised Is the Standard Model consistent (UV complete)?
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Sep
19
comment Definition of short range entanglement
Yes. My version of SRE implies vanishing thermal hall conductance in 2+1D.
Sep
19
revised Definition of short range entanglement
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Sep
19
revised Definition of short range entanglement
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Sep
19
revised Definition of short range entanglement
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Sep
19
revised Definition of short range entanglement
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Sep
19
comment Definition of short range entanglement
As Zitao Wang pointed out that "Kitaev said that there can be non-trivial SPT phases for a Majorana chain with trivial symmetry", which is equivalent to say "there can be non-trivial symmetry protect topological phases with no symmetry", if one uses Kiteav's definition of SRE and if one defines SPT states as SRE states. That sounds strange: where is the symmetry protection without symmetry. So if one defines SPT states as SRE states, then it is better to use our definition of SRE.
Sep
18
comment Explicit degeneracy in SPT phases
the degeneracy caused by an explicit symmetry is a special case of the degeneracy caused by spontaneous symmetry breaking.