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O: Fachverband Oberflächenphysik
O 101: Ertl Young Investigator Award Competition
O 101.1: Vortrag
Donnerstag, 19. März 2020, 10:30–11:00, TRE Ma
Magnetic resonance imaging of single atoms on a surface — •Philip Willke1,2,3, Aparajita Singha1,2, Xue Zhang1,2, Kai Yang3, Yujeong Bae1,2,3, Taner Esat1,2, Christopher Lutz3, Andreas Heinrich1,2, and Taeyoung Choi1,2 — 1Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea — 2Ewha Womans University, Seoul 03760, Republic of Korea — 3IBM Almaden Research Center, San Jose, USA
Combining electron spin resonance (ESR) with scanning tunneling microscopy (STM) allowed for spin resonance experiments on individual atoms on surfaces[1], for remote sensing of atomic spins[2] and for accessing the nuclear spin of single atoms in an STM[3]. In this talk, we focus on the interaction of the atomic spin system on the surface with the magnetic STM tip. We show that the tip field allows to tune the spin system into resonance similar to the external magnetic field, and that it can even fully replace the latter[4]. By utilizing this tip magnetic field, we establish magnetic resonance imaging of single atoms[5], exceeding the spatial resolution of other scanning field-gradient techniques by one to two orders of magnitude. We find that MRI scans of different atomic species and with different probe tips lead to unique resonance images revealing the magnetic interaction between tip and atom. [1] Baumann et al., Science, 350, 417-420 (2015). [1] Choi et al., Nat. Nano 12, 420-424(2017). [3] Willke et al., Science 362, 336-339 (2018) [4] Willke, Singha, Zhang et al., Nano Lett. 19, 8201-8206 (2019) [5] Willke et al. Nat. Phys. 15, 1005-1010 (2019).