Shot noise suppression at room temperature in atomic-scale Au junctions

Area of Science:

• Condensed matter physics
• Nanotechnology
• Quantum electronics

Background:

• Shot noise provides information beyond standard electronic transport measurements.
• Previous studies observed shot noise suppression in atomic junctions at cryogenic temperatures, indicating discrete quantum channels.
• Understanding quantum transport at room temperature is crucial for nanoscale devices.

Purpose of the Study:

• To investigate shot noise suppression in atomic-scale gold junctions at room temperature and ambient conditions.
• To demonstrate the quantum nature of charge transport at the atomic scale under ambient conditions.
• To explore the utility of high-frequency noise measurements for nanodevice characterization.

Main Methods:

• Utilized a high-frequency technique to simultaneously measure noise data and conductance histograms.
• Fabricated and studied atomic-scale gold (Au) junctions.
• Performed measurements at room temperature and ambient conditions.

Main Results:

• Observed shot noise suppression corresponding to up to three conductance quanta.
• Demonstrated quantum channel transport in atomic-scale gold junctions at room temperature.
• Identified potential signatures of current-induced local heating and 1/f noise at high biases.

Conclusions:

• The study confirms the quantum character of transport at the atomic scale under room temperature and ambient conditions.
• High-frequency noise measurement is a valuable tool for probing dissipation and correlations in nanodevices.
• Findings advance the understanding of electron transport in nanoscale systems.