20180511 Disordered Floquet topological insulators
“Disordered Floquet topological insulators” Dr. Kun Woo Kim Korea Institute for Advanced Study May. 11 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: The development of topological field theory in condensed matter physics has a long history since its successful but not yet fully resolved applications in 2-dim quantum Hall systems. As opposed to static systems where our concern is limited to the energy close to the Fermi level, in…
20180413 Quantum metrology with spin
“Quantum metrology with spin” Dr. ChanYong Hwang Quantum Technology Institute, KRISS Apr. 13 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: Spin angular momentum is one of two types of angular momentum in quantum mechanics. Though its introduction has been proposed more than 100 years, it is still considered as an abstruse quantum property not amenable to physical explanation. Staring from the overview on the origin of spin angular momentum,…
20180413 Spin collective phenomena in the superconducting phase of Sr2RuO4
“Spin collective phenomena in the superconducting phase of Sr2RuO4” Dr. Suk Bum Chung Department of Physics, University of Seoul Apr. 13 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: The spin-triplet superconductor by definition should involve spin ordering. I will show how this will give rise to the spin collective phenomena such as the spin collective modes and the spin supercurrent in the superconducting phase in the best-known candidate material,…
20180409 Doublon-holon origin of the subpeaks at the Hubbard band edges
“Doublon-holon origin of the subpeaks at the Hubbard band edges” Dr. Seung-Sup B. Lee Physics Department, LMU Munich Apr. 09 (Mon.), 11:00 AM E6-2. 1st fl. #1323 Abstract: Dynamical mean-field theory (DMFT) studies frequently observe a fine structure in the local spectral function of the SU(2) Fermi-Hubbard model (i.e., one-band Hubbard model) at half filling: In the metallic phase close to the Mott transition, subpeaks emerge at the inner edges…
20180316 Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics
“Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics” Dr. YoungDuck Kim Department of Physics, Kyung Hee University Mar. 16 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: van der Waals materials including graphene, hexagonal boron nitride and transition metal dichalcogenides (TMDCs) such as MoS2 and WSe2 have great potential for exploring the exotic quantum behaviors and realization of advanced optoelectronics devices. However, nature of 2D materials, extremely sensitive…
20180316 산화물 다층박막에서의 다양한 물리현상
“산화물 다층박막에서의 다양한 물리현상” Dr. JinHee Kim Quantum Technology Institute, KRISS Mar. 16 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: 페로브스카이트 산화물은 전자의 강한 상호작용의 결과로 다양한 물리현상을 보인다고 알려져 있다. 특히 SrTiO3(STO) 기판에 LaTiO3 (LAO)를 증착해 만든 STO/LAO이종접합의 계면에서는 전기 및 자기 특성과 관련된 흥미로운 물리현상들이 관찰된다. 본 강연에서는 이 분야에서의 최근 연구동향을 개괄하고 STO/LAO/STO 다층 박막의 특이한 물리현상 들에 관해 논의하고자 한다.
171201 Transport phenomena in nano systems; transport fluctuations in 2-dimensional systems and high current carrying capacity in metal-carbon nanotube composite fibers
“Transport phenomena in nano systems; transport fluctuations in 2-dimensional systems and high current carrying capacity in metal-carbon nanotube composite fibers” Dr. DongSu Lee Applied Quantum Composites Research Center, KIST Dec. 1 (Fri.), 04:00 PM E6-2. 1st fl. #1323 In the first part of my talk, I will discuss transport fluctuations observed in 2-dimensional systems [1]. Transport measurements normally provide a macroscopic, averaged view of the sample, so that disorder frequently…
171201 Gate control of spin information in a quantum well channel
“Gate control of spin information in a quantum well channel” Dr. HyunCheol Koo Center for Spintronics, KIST Dec. 1 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: In the semiconductor spintronics the Rashba spin splitting and the spin Hall effect are the two most compelling topics. In this talk, the experimental results of spin injection and gate control of spin precession is presented. The original Datta-Das prediction of a gate…
171103 Expedition to the Kitaev Quantum Spin Liquid: Hunting for Majorana fermions
“Expedition to the Kitaev Quantum Spin Liquid: Hunting for Majorana fermions” Dr. SungDae Ji Max Planck POSTECH/Hshinchu Center (MPK) Nov. 3 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: The seminal work of Anderson triggered a great deal of theoretical and experimental efforts to search for the novel quantum spin liquid (QSL) states in matters, and it has become one of central issues in contemporary condensed matter physics. The QSL…
171103 Quantum Resistor-Capacitor Circuit with Majorana Edge States
“Quantum Resistor-Capacitor Circuit with Majorana Edge States” Dr. MinChul Lee Department of Applied Physics, Kyung Hee University Nov. 3 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: In this talk we present the recent studies on the charge relaxation in the mesoscopic resistor-capacitor circuit consisting of a quantum dot coupled to Majorana fermion modes. Here we consider two Majorana edge modes: (1) the edge modes in a chiral topological superconductor…