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Two point-contact interferometer for quantum Hall systems
C. de C. Chamon, D. E. Freed, S. A. Kivelson +2
We propose a device, consisting of a Hall bar with two weak barriers, that can be used to study quantum interference effects in a strongly correlated system. We show how the device…
Disordered Critical Wave functions in Random Bond Models in Two Dimensions -- Random Lattice Fermions at without Doubling
Yasuhiro Hatsugai, Xiao-Gang Wen, Mahito Kohmoto
Random bond Hamiltonians of the flux state on the square lattice are investigated. It has a special symmetry and all states are paired except the ones with zero energy. Because…
Gaussian field theories, random Cantor sets and multifractality
Claudio de C. Chamon, Christopher Mudry, Xiao-Gang Wen
The computation of multifractal scaling properties associated with a critical field theory involves non-local operators and remains an open problem using conventional techniques of…
Two-dimensional conformal field theory for disordered systems at criticality
Christopher Mudry, Claudio Chamon, Xiao-Gang Wen
Using a Kac-Moody current algebra with graded symmetry, we describe a class of (possibly disordered) critical points in two spatial dimensions. The critical p…
Theory of Underdoped Cuprates
Xiao-Gang Wen, Patrick A. Lee
We develop a slave-boson theory for the t-J model at finite doping which respects an SU(2) symmetry -- a symmetry previously known to be important at half filling. The mean field p…
Topological orders and Edge excitations in FQH states
Xiao-Gang Wen
Fractional quantum Hall (FQH) liquids contain extremely rich internal structures which represent a whole new kind of ordering. We discuss characterization and classification of the…
Quantum Boltzmann equation of composite fermions interacting with a gauge field
Yong Baek Kim, Patrick A. Lee, Xiao-Gang Wen
We derive the quantum Boltzmann equation (QBE) of composite fermions at/near the state using the non-equilibrium Green's function technique. The lowest order perturbative…
Conductance of an Artificial Atom in Strong Magnetic Fields
O. Klein, C. de C. Chamon, D. Tang +4
The conductance resulting from resonant tunneling through a droplet of electrons is used to measure its chemical potential . Abrupt shifts of occur at sharpl…
Gauge-invariant response functions of fermions coupled to a gauge field
Yong Baek Kim, Akira Furusaki, Xiao-Gang Wen +1
We study a model of fermions interacting with a gauge field and calculate gauge-invariant two-particle Green's functions or response functions. The leading singular contributions f…
Chiral Operator Product Algebra and Edge Excitations of a Fractional Quantum Hall Droplet
Xiao-Gang Wen, Yong-Shi Wu, Yasuhiro Hatsugai
In this paper we study the spectrum of low-energy edge excitations of a fractional quantum Hall (FQH) droplet. We show how to generate, by conformal field theory (CFT) techniques,…
Chiral Operator Product Algebra Hidden in Certain Fractional Quantum Hall Wave Functions
Xiao-Gang Wen, Yong-Shi Wu
In this paper we study the conditions under which an N-electron wave function for a fractional quantum Hall (FQH) state can be viewed as N-point correlation function in a conformal…
Large N renormalization group study of the commensurate dirty boson problem
Yong Baek Kim, Xiao-Gang Wen
(Short Description) We use a large N renormalization group method to study a model of interacting boson system with a quenched random potential.