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Does quasi-long-range order in the two-dimensional XY model really survive weak random phase fluctuations?
Christopher Mudry, Xiao-Gang Wen
Effective theories for random critical points are usually non-unitary, and thus may contain relevant operators with negative scaling dimensions. To study the consequences of the ex…
Classification of Disordered Phases of Quantum Hall Edge States
Joel E. Moore, Xiao-Gang Wen
The effects of impurity scattering on a general Abelian fractional quantum Hall (FQH) edge state are analyzed within the chiral-Luttinger-liquid model of low-energy edge dynamics.…
Theory of Quasi-Particles in the Underdoped High Tc Superconducting State
Xiao-Gang Wen, Patrick A. Lee
The microscopic theory of superconducting (SC) state in the SU(2) slave-boson model is developed. We show how the pseudogap and Fermi surface (FS) segments in the normal state deve…
Electron and Quasiparticle Exponents of Haldane-Rezayi state in Non-abelian Fractional Quantum Hall Theory
Jen-Chi Lee, Xiao-Gang Wen
The quasiparticle propagator of Haldane-Rezayi(HR) fractional quantum Hall (FQH) state is calculated, based on a chiral fermion model (or a Weyl fermion model) equipped with a hidd…
Massless Dirac Fermions, Gauge Fields, and Underdoped Cuprates
Don H. Kim, Patrick A. Lee, Xiao-Gang Wen
We study 2+1 dimensional massless Dirac fermions and bosons coupled to a U(1) gauge field as a model for underdoped cuprates. We find that the uniform susceptibility and the specif…
The Unusual Superconducting State of Underdoped Cuprates
Patrick A. Lee, Xiao-Gang Wen
There is increasing experimental evidence that the superconducting energy gap in the underdoped cuprates is independent of doping concentration while the superfluid densi…