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Energent Lorentz Symmetry with Vanishing Velocity in a Critical Two-Subband Quantum Wire

Categories: Physics - Condensed Matter (PHYS-CM)
Speaker: Mattias Sitte, Univ. of Cologne
Date & Time: October 13, 2009 - 1:30pm
Location: Serin Physics E385

(special theoretical seminar) We consider a quantum wire with two subbands of spin-polarized electrons in the presence of strong interactions. We focus on the quantum phase transition when the second subband starts to get filled as a function of gate voltage. Performing a one-loop renormalization group analysis of the effective Hamiltonian, we identify the critical fixed-point theory as a conformal field theory having an enhanced SU(2) symmetry and central charge 3/2. While the fixed point is Lorentz invariant, the effective ``speed of light'' nevertheless vanishes at low energies due to marginally irrelevant operators leading to, eg., a diverging critical specific heat coefficient.

REFERENCE: M. Sitte, A. Rosch, J. S. Meyer, K. A. Matveev, and M. Garst Phys. Rev. Lett. 102, 176404 (2009)

Host:  Lev Ioffe

Advancing Nanotechnology - IAMDN New Microscopes


Rutgers new scanning transmission electron microscope and new helium ion microscope help researchers develop nanotechnology used to fight cancer, generate power, and create more powerful electronics. Watch the video to learn more.

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