Upcoming Talks and Events:
Due to COVID-19 we've postponed all events in our Center. Updates to come!
Je-Geun Park Affiliation: Department of Physics and Astronomy, Seoul National University Date: August 19, 2020; 16:00 - 17:00 Location: Saturn Seminar Room Current status and perspective of magnetic van der Waals materials research The discovery
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Affiliation: Department of Physics and Astronomy, Seoul National University
Date: August 19, 2020; 16:00 – 17:00
Location: Saturn Seminar Room
Current status and perspective of magnetic van der Waals materials research
The discovery of graphene in 2004 took the scientific community by surprise and virtually transformed the research landscape by creating a then-new field of 2d materials. However, despite the unique properties of many van der Waals materials since discovered, it has certain limitations in terms of exploring novel and new physical properties. Magnetism is a case in point. Until a couple of groups and I started to work on the much-neglected magnetic van der Waals materials, virtually nothing was known about it. However, with a series of publications, including those from my group, this field of magnetic van der Waals materials has become a fast emerging field in materials science. In this presentation, I would like to take you through the intellectual journey I made since 2010 and eventually discovering a novel quantum spin-entangled exciton NiPS3 more recently. I will end my talk by giving a personal view of the prospect for future research.
 Je-Geun Park, J.Phys. Condens. Matter 28, 301001 (2016)
 Cheng-Tai Kuo, et al., Scientific Reports 6, 20904 (2016)
 Jae-Ung Lee, et al., Nano Lett. 16, 7433 (2016)
 So Yeun Kim, et al., Phys. Rev. Lett. 120, 136402 (2018)
 K. S. Burch, D.Mandrus, and Je-Geun Park, Nature 563, 47 (2018)
 Kangwon Kim, et al., Nature Comm. 10, 345 (2019)
 H Chu, et al., Phys. Rev. Lett. 124, 027601 (2020)
 S. Kang, et al., Nature 583, 785 (2020)
(Wednesday) 4:00 pm - 5:00 pm KST
ESR-STM Workshop Due to COVID-19 the organizers have postponed the workshop. Updates to come! Visit Dates: April 20-23, 2020 Location: International Iberian Nanotechnology Laboratory, Portugal The discovery of Scanning Tunneling Microscope
Due to COVID-19 the organizers have postponed the workshop. Updates to come!
Visit Dates: April 20-23, 2020
Location: International Iberian Nanotechnology Laboratory, Portugal
The discovery of Scanning Tunneling Microscope (STM) Electron Spin Resonance (ESR) is opening new venues in surface quantum nanoscience. This workshop will bring together experts in this emerging area to present latest developments and discuss future work.
Participation only by invitation
april 20 (Tuesday) - 23 (Friday)
Past Talks and Events:
Affiliation: Ulsan University, South Korea
Date: June 15, 2020
Time: 15:00 -16:00
Emerging Spin-Related Phenomena in the Non-Centrosymmetric Artificial Superlattice
Various spin-relatedphenomena, such as chiral texture formation, spin-orbit torque, andRashba-induced magnetic anisotropy, have been important issues in spintronicsfield. Those phenomena are known to be observable in a bilayer structurecomposed of a ferromagnet and a heavy metal thin films with strong spin-orbitcoupling. In addition, relevant orbital hybridization is also crucial factor.Therefore, researches are limited with few material cases, which has strongspin-orbit coupling, large Berry curvature in a band, and good spintransparency. In this talk, I will introduce a new concept of a materialsystem, namely, a non-centrosymmetric artificial superlattice. I will presentthat several artificial superlattices that show large spinorbit torque, and Dzyaloshinksii-Moriya interaction. Non-centrosymmetricartificial superlattices will be a new class of material design for spinorbitronic devices.
(Monday) 3:00 pm - 4:00 pm KST
Andreas Heinrich Date: June 15, 2020 Time: 17:00 -18:00 The Talk is provided by orginizers from Aalto University, Finland Click here to register >> Virtual Talk - Electron Spin Resonance of single atoms on
Date: June 15, 2020
Time: 17:00 -18:00
The Talk is provided by orginizers from Aalto University, Finland
Virtual Talk – Electron Spin Resonance of single atoms on a surface observed with STM
Scanning Tunneling Microscopy (STM) can be combined with electron spin resonance . The major advantage of spin resonance is the fact that the energy resolution is independent of the temperature and thus can be much higher than a Fermi-function limited spectroscopy technique such as STM tunneling. In ESR STM we apply a microwave-frequency electric field to the STM tunnel junction and convert this AC electric field into a driving field for the ESR . We find an energy resolution in ESR STM, which is about 10,000 times better than low-temperature STM.
Here we will focus on two examples: Fe and Ti atoms on MgO on Ag(100). Fe on MgO has a spin of S=2 with a strong out-of-plane easy-axis magnetic anisotropy. ESR active Fe atoms can be used to measure the local magnetic field very precisely and with atomic-scale spatial resolution. We will use this to measure the magnetic field emanating from a stable single-atom magnet nearby: Ho on MgO .
Ti atoms on MgO are an S=1/2 electron system (when a single Hydrogen is attached) with an interesting nuclear spin system, consisting of several isotopes (I=0, I=5/2 and I=7/2). ESR STM can measure the hyperfine interaction of the electron spin with the nuclear spin of the Ti atom . The hyperfine interaction is a sensitive measure of the local bonding geometry.
ESR STM is just in its infancy with many groups joining this research effort.
Support from Institute for Basic Science (IBS-R027-D1) is gratefully acknowledged.
 Susanne Baumann, William Paul, Taeyoung Choi, Christopher P. Lutz, Arzhang Ardavan, Andreas J. Heinrich, “Electron Paramagnetic Resonance of Individual Atoms on a Surface”, Science 350, 417 (2015)
 Reina Gálvez, C. Wolf, F. Delgado, and N. Lorente, Physical Review B 100, 035411 (2019)
 Fabio Donati, S Rusponi, Sebastian Stepanow, C Wäckerlin, Aparajita Singha, Luca Persichetti, R Baltic, K Diller, Francois Patthey, E Fernandes, Jan Dreiser, Željko Šljivančanin, K Kummer, Corneliu Nistor, Pietro Gambardella, Harald Brune, Science 352, 318 (2016)
 Philip Willke, Yujeong Bae, Kai Yang, Jose L. Lado, Alejandro Ferrón, Taeyoung Choi, Arzhang Ardavan, Joaquín Fernández-Rossier, Andreas J. Heinrich and Christopher P. Lutz, “Hyperfine interaction of individual atoms on a surface”, Science 362, 336 (2018)
(Monday) 5:00 pm - 6:00 pm KST
Virtual Workshop on Scanning Probe Microscopy Date: June 18, 2020 Time: 9:00 - 13:00 CEST (16:00 - 20:00 KST) Location: ZOOM Virtual SPM is a free online workshop on recent advances in
Virtual Workshop on Scanning Probe Microscopy
Date: June 18, 2020
Time: 9:00 – 13:00 CEST (16:00 – 20:00 KST)
Virtual SPM is a free online workshop on recent advances in scanning probe techniques, in particular low-temperature UHV scanning tunneling microscopy and atomic force microscopy.
With three invited talks, discussion time and a live poster session to provide further opportunity to share ideas and results, we hope this event will bring the community together to discuss the latest advances and keep sharing results despite the current lack of in-person conferences. Registration is open!
This workshop is organized with the support of the Virtual Science Forum, a platform that helps with the organization of online conferences.
(Thursday) 4:00 pm - 8:00 pm KST