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Feb
23
awarded  Commentator
Feb
23
comment AdS/CFT and Kondo problem/ Ginzburg-Landau theory
2)The thermal phase transition in AdS/CFT is similar to GL theory, i.e. it is a mean field phase transition. However, AdS/CFT of course goes beyond GL theory, see e.g. arxiv.org/abs/1110.3814
Feb
23
comment AdS/CFT and Kondo problem/ Ginzburg-Landau theory
1) It can be seen from the correlators for the operators in the dual field theory of AdS2 times R2, e.g. arxiv.org/abs/1105.4621
Feb
4
asked Weyl semi metal vs entanglement entropy
Dec
12
comment can a gapless system be a topological state?
Thanks for your patient clarifications! But I am still curious if a topological state can be defined via a response property since with interactions the single particle picture may breaks down. A related question: recently @Xiao-Gang Wen is trying to classify the topological order for topological state from gapped systems. What would be the topological order parameter for this WsM like gapless topological state?
Dec
12
awarded  Supporter
Dec
11
comment can a gapless system be a topological state?
I am totally from outside:) Is there any material example in which all the transport physics are very similar to WsM (can be explained by chiral anomaly, e.g. negative magneto resistance, anomalous Hall effect etc.) but there is no similar ARPES observations (Weyl nodes + Fermi Arc)? If one realise such material, would it be topological matter?
Dec
11
comment can a gapless system be a topological state?
I was curious about the role of boundary excitations in WSM. Is it possible to realise a similar topological system without any boundary excitations? Maybe I am wrong, since the effective electromagnetic interaction strength in WSM systems is or order 1, WsM should be a strongly coupled system. The free Weyl fermion picture (with Weyl nodes) might be broken down in some strongly coupled WSM systems (thus no boundary state?), but it might be still possible to be in a topological state.
Dec
11
comment can a gapless system be a topological state?
Thanks for your helpful comment! More naive questions: Is Weyl semi-metal a topological system with gapless excitations? Is it possible that for such system (e.g. translational invariant ideal WSM in some strongly coupled case) there is no Fermi arc like boundary excitations? Thanks!
Dec
11
asked can a gapless system be a topological state?
Mar
8
awarded  Editor
Mar
8
revised entropy relation between ads$_2$ black hole and near extremal ads RN black brane
added 107 characters in body
Mar
8
asked entropy relation between ads$_2$ black hole and near extremal ads RN black brane
Mar
7
comment Chiral Landau's fermi liquid theory in 3+1D
3+1D means 3 spatial dimensions and 1 time dimensions, i.e. the space-time we are living.
Feb
25
comment Chiral Landau's fermi liquid theory in 3+1D
Is it still massless at low energy and why?
Feb
24
awarded  Disciplined
Feb
24
asked Chiral Landau's fermi liquid theory in 3+1D
Jun
12
comment About Holographic Model of Magnetism and Superconductor
From linear response theory, the vev of an operator is always nontrivial if we turned on some source, no matter which phase are the system in. Just like in CMT, for a metal in the normal phase, if we turned on the source for the paring order parameter, the vev is not zero. However, the system is in the normal phase. Of course we can put the system with some external source turning on and study the phase transition, e.g. 1111.2606. Right now I am not sure which order parameter should it be in this system.
Jun
12
awarded  Revival
Jun
11
awarded  Teacher