Dr. Dongwook Go

CV (link)

Research interests

My research focuses on the dynamics and transport of the orbital degree of freedom of electrons. This is a core concept in a new emerging research field, orbitronics, of which I am recognized as one of the pioneers.

While the orbital degree of freedom has been regarded "quenched", as is explained in many textbooks, I have disproven that the orbital information manifests in non-equilibrium and plays a crucial role in many dynamic and transport phenomena, despite the orbital quenching in the ground state. In magnetic systems, for example, transfer of the orbital angular momentum into local moments can be a source of magnetization dynamics, which has been almost entirely overlooked in the past. Orbitronics is one of the fast-growing fields in condensed matter physics and magnetism research nowadays, and more and more orbitronic phenomena are being revealed each year.

As a theoretical physicists, my research focuses on theory and simulation, but I am also keen on experiments, which are the source of my ideas and motivations.

My representative theroetical works include:

• Robustness of the intrinsic orbital Hall effect in light metals [Physical Review Letters 121, 086602 (2018)]
• Magnetic torque induced by orbital currents [Physical Review Research, 2, 013177 (2020)]
• General theory of angular momentum transfer in solids [Physical Review Research 2, 033401 (2020)]
• Long-range orbital response in ferromagnets [Physical Review Letters 130, 246701 (2023)]

Recent publications from the collaboration with experimentalists are:

• Magneto-optical detection of orbital Hall effect [Nature 619, 52 (2023)]
• Observation of ballistic orbital current by THz spectroscopy [Nature Nanotechnology 18, 1132 (2023)]
• Observation of long-range orbital torque [Communications Physics 6, 32 (2023); Physical Review B 107, 134423 (2023)]
• Observation of a new type of magnetoresistance due to orbital angular momentum [Physical Review Letters 128, 067201 (2022)]
• Observation of orbital-to-spin conversion [Physical Review Letters 125, 177201 (2020); Communications Physics 4,234 (2021)]
• Orbital torque in magnetic bilayers [Nature Communications 12, 6710 (2021)]
• Unconventional torque generation from Cu-oxide interface [Physical Review B 103, L020407 (2021)]
• Pumping of spin-orbital entangled electrons by ferromagnetic resonance [Physical Review Applied 19, 014069 (2023) ]

Collaborators

Theory

• Prof. Yuriy Mokrousov (FZ Jülich & JGU Mainz, Germany) *Postdoc supervisor
• Prof. Stefan Blügel (FZ Jülich, Germany)
• Prof. Hyun-Woo Lee (POSTECH, Korea)
• Dr. Daegeun Jo (Uppsala University, Sweden)
• Prof. Aurélien Manchon (CINaM, Aix-Marseille University)
• Prof. Kyung-Jin Lee (KAIST, Korea)
• Dr. Paul M. Haney (NIST, USA)
• Prof. Olena Gomonay (JGU Mainz, Germany)

Experiment

• Prof. Mathias Kläui (JGU Mainz, Germany)
• Prof. YoshiChika Otani (RIKEN & Tokyo University, Japan)
• Prof. Kazuya Ando (Keio University, Japan)
• Prof. Tobias Kampfrath (FU Berlin, Germany)
• Prof. Antonio Azevedo (Federal University of Pernambuco)