Shot noise in ballistic quantum dots with a mixed classical phase space

Area of Science:

• Quantum physics
• Mesoscopic physics
• Condensed matter physics

Background:

• Quantum dots exhibit complex classical phase space dynamics.
• Shot noise in chaotic systems reaches a universal value.
• Understanding quantum transport in mixed regular-chaotic systems is crucial.

Purpose of the Study:

• Investigate shot noise in quantum dots with mixed regular and chaotic phase space.
• Analyze the dynamical origins of shot noise suppression.
• Explore the use of shot noise as a probe for quantum dot phase-space structures.

Main Methods:

• Numerical investigation of shot noise in quantum dots.
• Incorporation of diffractive impurity scattering to model transport.
• Analysis of noise dependence on lead positions and scattering rates.

Main Results:

• Shot noise is systematically suppressed below the universal value for fully chaotic systems.
• Noise suppression varies with the positions of the electrical leads.
• Suppression is linked to deterministic transport in regular regions and short chaotic trajectories.

Conclusions:

• Shot noise suppression in quantum dots with mixed dynamics is a significant effect.
• Diffractive impurity scattering plays a key role in this suppression.
• Shot noise serves as a valuable tool for probing the phase-space structures of quantum systems.