Title : Orbitronics: Orbital Quantum State as an Information Carrier in Materials
일시 : 2025년 9월 9일 (화), 17시
장소 : 아산이학관 433호
Speaker : 고동욱 (고려대학교 물리학과)
Abstracts:
Traditionally, orbitals have been studied only in the context of the structural and chemical properties of materials in statics, and the possibility of dynamically controlling orbitals in matter—corresponding to excitation of chemical bonds—was not explored much. However, recent studies on magneto-transport in condensed matter systems have revealed marvelous transport phenomena carried by orbital-polarized electrons, defying the traditional view of ‘orbital quenching’. This led to the emergence of new research field orbitronics, which aims to overcome grand challenges in nanoelectronics by exploiting the orbital degree of freedom as a new type of information carrier. Now that the so-called orbital current is discovered, plethora of possibilities are open for using this new type of current in many areas in physics, including spintronics, topological matters, strongly correlated systems, and ultrafast magneto-optics.
In this colloquium, I will give a bird-eye-view on orbitronics and introduce core physical foundation of the field for everyone in the department. As well as showcasing state-of-the-art theories and experiments, I will also try to build analogies to other fields, which share important concepts such as chirality, gauge, vorticity, and quantum information processing. Toward the end, I will also show my research plan at Korea University and strategies to make synergy with the research projects carried by other faculty members.