Tunneling spectroscopy in the weak backscattering limit at the ν = 1/3 FQHE

Fractional quantum Hall edge modes are theoretically described as one-dimensional Luttinger liquids. Here we report measurements of tunneling spectroscopy in the weak backscattering regime at the Laughlin ν = 1/3 state. The experiment utilizes a quantum point contact (qpc) fabricated on AlGaAs/GaAs screening well heterostructures that have previously been shown to promote sharp edge confining potential. Differential conductance has been measured over a range of qpc transmission ranging from weak backscattering to strong backscattering. The temperature dependence of differential conductance was measured for several temperatures ranging from T=10mK to 250mK. Comparison of the data with theoretical predications for Luttinger liquid behavior at n=1/3 will be presented.