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Chao-Jung Lee

As seen in: Physical Review B
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Articles by Chao-Jung Lee

Universal conductivity at a two-dimensional superconductor-insulator transition: The effects of quenched disorder and Coulomb interaction

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By Chao-Jung Lee, Michael Mulligan
| Physical Review B
We calculate the zero-temperature dc electrical conductivity in the collisionless ℏω/kBT→∞ limit at superconductor-insulator transitions in the (2+1)d XY model universality class. We use a dual model consisting of a single Dirac fermion at zero density, coupled to a Chern-Simons gauge field and in the presence of a quenched random mass, with or without an unscreened Coulomb interaction. Our calculation is performed in a 1/Nf expansion, where Nf is the number of Dirac fermions.
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Current algebra approach to two-dimensional interacting chiral metals

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By Chao-Jung Lee, Michael Mulligan
| Physical Review B
Abstract We reinterpret the chiral U(N) Wess-Zumino-Witten (WZW) model at level k>1 in (1+1) dimensions as an interacting chiral metal in two space dimensions. In this reinterpretation, spatial translations along one of the spatial dimensions in the two-dimensional chiral metal arise from a generator of the U(N) symmetry of the WZW model. The WZW model at k=1 is equivalent to Balents and Fisher's free chiral metal [L. Balents and M. P. A. Fisher, Phys. Rev. Lett. 76, 2782 (1996)].
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Random magnetic field and the Dirac Fermi surface

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By Michael Mulligan, Chao-Jung Lee
| Physical Review B
Abstract We study a single two-dimensional Dirac fermion at finite density, subject to a quenched random magnetic field. At low energies and sufficiently weak disorder, the theory maps onto an infinite collection of 1D chiral fermions (associated to each point on the Fermi surface) coupled by a random vector potential.
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