Shot-noise evidence of fractional quasiparticle creation in a local fractional quantum Hall state

TL;DR

This study demonstrates the creation of fractional quasiparticles in a local fractional quantum Hall state through shot-noise measurements, revealing a transition from elementary to fractional charge tunneling in a quantum Hall system.

Contribution

First experimental evidence of fractional quasiparticle creation in a local FQH state via shot-noise, showing a transition from elementary to fractional charge tunneling.

Findings

Shot noise shows a transition from elementary to fractional charge.

Fractional shot noise follows a binomial distribution proportional to T1(1 - T1).

Fractional quasiparticles emerge from the IQH state to the FQH state.

Abstract

We have experimentally identified fractional quasiparticle creation in a tunneling process through a local fractional quantum Hall (FQH) state. The local FQH state is prepared in a low-density region near a quantum point contact (QPC) in an integer quantum Hall (IQH) system. Shot-noise measurements reveal a clear transition from elementary-charge tunneling at low bias to fractional-charge tunneling at high bias. The fractional shot noise is proportional to T1(1 ? T1) over a wide range of T1, where T1 is the transmission probability of the IQH edge channel. This binomial distribution indicates that fractional quasiparticles emerge from the IQH state to be transmitted through the local FQH state. The study of this tunneling process will enable us to elucidate the dynamics of Laughlin quasiparticles in FQH systems.