Negative Delta-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>T</mml:mi></mml:math> Noise in the Fractional Quantum Hall Effect
Jérôme Rech, Thibaut Jonckheere, Benoît Grémaud, Thierry Martin
Abstract
We study the current correlations of fractional quantum Hall edges at the output of a quantum point contact subjected to a temperature gradient. This out-of-equilibrium situation gives rise to a form of temperature-activated shot noise, dubbed delta-T noise. We show that the tunneling of Laughlin quasiparticles leads to a negative delta-T noise, in stark contrast with electron tunneling. Moreover, varying the transmission of the quantum point contact or applying a voltage bias across the Hall bar may flip the sign of this noise contribution, yielding signatures that can be accessed experimentally.
Topics & Concepts
Shot noiseQuasiparticlePhysicsNoise (video)Quantum tunnellingFractional quantum Hall effectCondensed matter physicsQuantum point contactQuantum Hall effectQuantum mechanicsElectronQuantum spin Hall effectQuantum wellSuperconductivityOpticsImage (mathematics)LaserDetectorComputer scienceArtificial intelligenceQuantum and electron transport phenomenaAdvancements in Semiconductor Devices and Circuit DesignPhysics of Superconductivity and Magnetism