Theory of “Charge” Measured by Shot Noise Experiments in Fractional Quantum Hall States

抄録

A shot noise at filling factor ν=2⁄5 is investigated theoretically. It is argued that the “charge” e^* measured by the noise at absolute zero is not the quasiparticle charge but simply the filling factor times the electron charge e, namely e^*=2e⁄5. At a higher temperature, quasiparticles with charge e^*=±e⁄5 begin to contribute to backscattering, and the shot noise provides charge e^*=e⁄5. This theory explains the recent experiment by Chung et al. [Phys. Rev. Lett. 91 (2003) 216804].