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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Scanning Gate Microscope for Cold Atomic Gases.

Samuel Häusler¹, Shuta Nakajima², Martin Lebrat¹

¹Department of Physics, ETH Zurich, 8093 Zurich, Switzerland.

Physical Review Letters

|August 5, 2017

Summary

This summary is machine-generated.

We developed a new scanning probe microscopy method to map atomic gas transport with nanoscale precision. This technique visualizes conductance variations, revealing tunneling dominance over thermal effects in quantum point contacts.

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Area of Science:

Atomic, Molecular, and Optical Physics
Condensed Matter Physics
Nanoscale Science

Background:

Scanning probe microscopy is crucial for nanoscale investigations.
Understanding transport phenomena in cold atomic gases is challenging.
Quantum point contacts are fundamental systems for studying electron transport.

Purpose of the Study:

To introduce a novel scanning probe microscopy technique for spatially resolving transport in cold atomic gases.
To achieve high-resolution mapping of conductance through a quantum point contact.
To investigate the interplay between tunneling and thermal effects in atomic transport.

Main Methods:

Utilizing a tightly focused laser beam as a local perturbation source.
Precisely positioning the laser beam in space to scan the quantum point contact.
Measuring conductance variations of the quantum point contact in response to the laser perturbation.
Employing analytical models and ab initio numerical simulations for data interpretation.

Main Results:

Achieved high-resolution spatial mapping of transport through a quantum point contact.
Demonstrated spatial resolution comparable to the atomic wave function extent.
Exhibited position sensitivity below 10 nanometers.
Identified a transport regime dominated by tunneling over thermal effects.

Conclusions:

The developed technique offers unprecedented spatial resolution for studying cold atomic gases.
This method enables detailed observation and manipulation of transport phenomena at the nanoscale.
Findings provide insights into fundamental transport mechanisms in quantum systems.