Xiao-Gang Wen

2,951 reputation

1223

bio	website	dao.mit.edu/~wen
	location	Waterloo, Canada
	age	51
visits	member for	11 months
	seen	yesterday
stats	profile views	3,882

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.

	2,951 reputation	bio	website	dao.mit.edu/~wen	visits	member for	11 months
1223 badges		location	Waterloo, Canada		seen	yesterday

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May 9	answered	Chiral coupling in string-nets
May 9	revised	How do you simulate chiral gauge theories on a computer? added 244 characters in body
May 9	answered	How to understand the emergent special relativity in the superfluid?
May 7	comment	Gauge symmetry is not a symmetry? @drake: I think I agree with you: gauge symmetry is not a true symmetry even in classical physics. But it could be viewed as a symmetry (ie local symmetry) in classical physics. Gauge symmetry cannot be viewed as a symmetry in quantum physics.
May 7	comment	What is spontaneous symmetry breaking in QUANTUM GAUGE systems? @drake: In my language for the situation that you described, $G_$ is the gauge symmetry which cannot break. $G/G_$ is the physical symmetry which can break.
May 7	revised	Topological Charge. What is it Physically? edited tags
May 7	revised	Whis is the difference between charge fractionalization in 1D and 2D? edited tags; edited title
May 7	revised	Topological Charge. What is it Physically? added 132 characters in body
May 7	revised	A physical understanding of fractionalization added 100 characters in body
May 7	revised	Topological Charge. What is it Physically? added 149 characters in body
May 7	revised	Why is fractional statistics and non-Abelian common for fractional charges? added 1 characters in body
May 7	answered	Topological Charge. What is it Physically?
May 3	comment	Whis is the difference between charge fractionalization in 1D and 2D? No. Here we only consider systems with short range interactions and short range hopping. Even with short range interactions and short range hopping, the ground state can be long-range entangled. Long-range entanglement is a new concept, which was defined in arxiv.org/abs/1004.3835 . See also arxiv.org/abs/1210.1281 ,
May 2	revised	Whis is the difference between charge fractionalization in 1D and 2D? added 33 characters in body
May 1	revised	Whis is the difference between charge fractionalization in 1D and 2D? added 176 characters in body
May 1	answered	Whis is the difference between charge fractionalization in 1D and 2D?
Apr 14	revised	A question on the doped Kitaev-Heisenberg model? edited tags
Apr 6	revised	Are Hall edge currents truly dissipationless? deleted 2 characters in body
Mar 26	comment	What is the “BCS Cooper pair condensation” as a physical phenomenon in terms of experiments? Here we only concern about the kinds of SC states. We do not concern about the phase transitions, which is a totally different issue. "What observables are indicative of BCS Cooper pair condensation?"
Mar 26	comment	What is the “BCS Cooper pair condensation” as a physical phenomenon in terms of experiments? Thanks for the comments. It reveals one important point. By definition, "BCS Cooper pair condensation" only describe those SC states that are describable by quadratic effective Hamiltonians $H_{eff}=\sum c_i^\dagger c_j + c_i c_j +h.c.$. Both "old-fashionned" BCS states and new "topological superconductors" are "BCS Cooper pair condensation" in this sense. But there are strongly interacting superconductors which may contain more exotic topological orders that can never be described by quadratic effective Hamiltonians. Do we have an experimental way to seperate the two kinds of SC states?