Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 47: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 1

O 47.1: Topical Talk

Wednesday, September 7, 2022, 15:00–15:30, S051

Quantum control of multi-spin architectures on a surface — •Yujeong Bae — Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS), 03760 Seoul, South Korea — Department of Physics, Ewha Womans University, Seoul 03760, South Korea

The spin-polarized scanning tunneling microscopy (STM) combined with electron spin resonance (ESR) [1] enables us to achieve single spin sensitivity with atomic precision. Employing ESR-STM, a single spin on a surface can be coherently probed and controlled [1,2], where the magnetic tip is positioned directly on the target spin. Here, we demonstrate a new approach to coherently control multi-electron spins in a quantum spin architecture crafted atom-by-atom. We found the remote spins, which are outside the tunnel junction, can be controlled by the local oscillating magnetic fields created by a single-atom magnet placed next to them in oscillating electric fields. The read-out of multi-electron spins is achieved by a sensor atom weakly coupled to them. The resonances of the sensor spin are separated in the frequency domain so that we can independently and simultaneously control the sensor and remote spins. Our work shows the enhanced coherent properties of the remote spins as well as fast controlled operations of multi-electrons in an all-electrical fashion. Our development widens the approaches to the multi-spin control in tailored spin structures on a surface.

[1] S. Baumann et al., Science, 350 (2015) 417.

[2] K. Yang et al., Science, 366 (2019) 509.