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Quantum Science with Single Atoms on Surfaces

Date: Wednesday, February 13, 2019 10:00 - 11:00
Speaker: Philip Willke (Ewha Womans University)
Location: Mondi Seminar Room 2, Central Building
Series: Physical Sciences Seminar
Host: Johannes Fink

Scanning tunneling microscopy (STM) has proven to be an excellent tool to access and manipulate the nanoworld. Nevertheless, up to now it did not allow for coherent manipulation of spin systems as it is common in other architectures. In this talk I will introduce how we establish a new framework for quantum coherent control and magnetic sensing of single atoms by combining electron spin resonance and STM. For instance, this technique can be used to sense the magnetic coupling between atomic spin centers and also to detect the hyperfine interaction between their electron and nuclear spin. I will point out how we will extend this technique to a universal atomic-scale sensor to study magnetism in molecules and condensed matter systems and how to improve the coherent properties of these atomic spin systems.

In addition, STM can be used to map the electron transport in a sample with ultimate spatial resolution. In this way, it can reveal the electric resistance of localized defects such as grain boundaries. Here, I will discuss how we want to enhance this technique to access quantum transport phenomena on the atomic scale and probe the influence of single adatoms and defect centers.
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