557 research outputs found
Tunneling into a Fractional Quantum Hall System and the Infrared Catastrophe
We calculate the tunneling density of states of a two-dimensional interacting
electron gas in a quantizing magnetic field. We show that the observed
pseudogap in the density of states can be understood as the result of an
infrared catastrophe in a noninteracting electron model. This catastrophe stems
from the response of an electronic system to the potential produced by the
abruptly added charge during a tunneling event. Our formalism can be applied at
any filling factor without the use of Chern-Simons or composite fermion theory
Quantum Breathing Mode for Electrons with 1/r^2 Interaction
We discuss a collective "breathing" mode of electrons with inverse-square-law
interactions in a two-dimensional quantum dot and a perpendicular magnetic
field.Comment: 1 page, Revtex, submitted to "Comment" Section of Phys. Rev. Let
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