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Josephine stepped on my aircraft.


Sep
24
awarded  Autobiographer
Aug
16
asked Relation between p+ip wave Superconductor and Moore-Read State
Aug
16
asked Effective Theory of FQH Edge State
Jul
2
awarded  Curious
Apr
26
awarded  Popular Question
Dec
9
awarded  Nice Question
Sep
19
awarded  Yearling
Apr
29
awarded  Nice Question
Apr
20
comment Some questions about Ward-Takahashi Identity
@soliton Can you give some explanation about your equation? Thank you!
Apr
19
accepted What does the term liquid mean in condensed matter physics?
Apr
19
comment Some questions about Ward-Takahashi Identity
Thank you for your answer. Besides, when defining mass shell, $p^{\mu}p_{\mu}=m^2$, is m the bass mass or physical mass?
Apr
19
asked Some questions about Ward-Takahashi Identity
Feb
3
comment Chiral edge state as topological properity of bulk state
The existance of edge is robust under disorder. While 'Chiral' means back scattering is forbidden. Can we understand the robustness as the result of the existance of 'chiral' edge mode? This way, maybe we can say all edge states of topological nontrivial state is chiral.
Feb
3
comment Chiral edge state as topological properity of bulk state
Thanks for your answer. Your second paragraph seems to explain the reason of 'gapless'. Do you have examples that edge state is not chiral?
Feb
2
comment Why quantum hall effect has chiral edge state?
Thanks a lot. I still have one puzzle in my mind. I want to understand how band inversion can change the topological invariant. For example, how does it change Z_2 invariant? thanks.
Feb
2
comment Why quantum hall effect has chiral edge state?
There is also a physical picture of band inversion to illustrate topological nontrivial state. For example, the first topological insulator proposed by Shoucheng Zhang in quantum wells. Does the 'inverted' in your reply refers to the inversion of valence and conduction bands?
Feb
2
comment Why quantum hall effect has chiral edge state?
Thanks. Yes, I know closing gap leads to quantum phase transition, which will change the topological invariant; and this is the reason surface states are always gapless.
Feb
2
asked Chiral edge state as topological properity of bulk state
Feb
2
comment Why quantum hall effect has chiral edge state?
I know that quantum spin hall effect and topological superconducting state also has chiral state. Is chiral state a result of bulk topological properity?
Feb
2
comment Why quantum hall effect has chiral edge state?
Thanks very much for your answer. This is quite a good point of view.