20210514 Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions
“Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions” Dr. Suyong Jung Interdisciplinary Materials Measurement Institute, KRISS May. 14 (Fri.), 02:30 PM Online seminar https://kaist.zoom.us/j/87512814606 회의 ID: 875 1281 4606 암호: 816956 Abstract: Magnetic tunnel junctions (MTJ) and ensuing spin-valve operations employing high and low magnetoresistance (MR) states have laid the foundations for many of commercial spintronic applications. Coping with the already established field, it is highly desirable…
20210402 Van der Waals heterostructures for orbital gating-based phototransistors and electronic spectroscopy
“Van der Waals heterostructures for orbital gating-based phototransistors and electronic spectroscopy” Dr. Heejun Yang Department of Physics, KAIST Apr. 2 (Fri.), 04:00 PM Online seminar https://kaist.zoom.us/j/85719491744 회의 ID: 857 1949 1744 암호: 757633 Abstract: Each atomic layer in van der Waals (vdW) heterostructures possesses a distinct electronic band structure that can be manipulated for unique device operations. In the precise device architecture, the subtle but critical band coupling between the…
20210402 Quantum computing and entanglement generation using trapped ions and photons
IBM, Microsoft, Google, Amazon, Intel, Alibaba와 같은 글로벌 IT 기업들이 양자 컴퓨 터의 상용화에 관심을 가짐에 따라 양자 컴퓨터 생태계가 점차 형성되고 있는 가 운데, 최근에는 포획된 이온을 큐비트로 사용하여 양자 컴퓨터를 개발하는 IonQ 사의 뉴욕 증시 상장 계획이 알려짐에 따라 이온트랩에 대해서도 많은 관심이 집 중되고 있다. 본 세미나에서는 이온트랩 기반의 양자 컴퓨팅 및 양자 네트워크 관련하여 진행 중인 몇가지 연구들을 소개할 예정이다. 특히, 개별 이온들의 포획 부터 양자…
20210209 Metal-insulator transition of NdNiO3 nanogaps and angle-dependent magnetoresistance at Pt/YCrO3 interfaces
“Metal-insulator transition of NdNiO3 nanogaps and angle-dependent magnetoresistance at Pt/YCrO3 interfaces” Dr. Jin Hong Lee Unité Mixte de Physique, CNRS Feb. 9 (Tue.), 05:00 PM Online seminar https://kaist.zoom.us/j/86593232866 회의 ID: 865 9323 2866 암호: 404052 Abstract: In this presentation, transition-metal oxide devices based on the first-order metal-insulator transition (MIT) of NdNiO3 (NNO) or the interfacial phenomena between antiferromagnetic YCrO3 (YCO) and heavy metal will be discussed. In the first part,…
20210209 Challenges and Prospects of Kitaev Magnet α-RuCl3
“Challenges and Prospects of Kitaev Magnet α-RuCl3” Dr. Kwang Yong Choi Department of Physics, Chung-Ang University Feb. 9 (Tue.), 01:30 PM Online seminar https://kaist.zoom.us/j/86593232866 회의 ID: 865 9323 2866 암호: 404052 Abstract: The celebrated Kitaev honeycomb model provides a novel platform to achieve a Z2 quantum spin liquid and Majorana quasiparticles. More significantly, applying a magnetic field engenders a non-Abelian chiral spin liquid, featuring both gapped charge-neutral fermions and Ising…
20201211 Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials
“Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials” Dr. Hyobin Yoo Department of Physics, Sogang University Dec. 11 (Fri.), 04:00 PM Online seminar https://kaist.zoom.us/j/89400733670 회의 ID: 894 0073 3670 암호: 703454 Abstract: Interfaces between crystalline materials have been an essential engineering platform for modern electronics. At the interfaces formed by stacking two different two-dimensional (2D) van der Waals (vdW) crystals, one can freely control the…
20201211 Antisymmetric interlayer exchange coupling in magnetic multilayers
“Antisymmetric interlayer exchange coupling in magnetic multilayers” Dr. Myung Hwa Jung Department of Physics, Sogang University Dec. 11 (Fri.), 02:30 PM Online seminar https://kaist.zoom.us/j/89400733670 회의 ID: 894 0073 3670 암호: 703454 Abstract: The exchange interaction governs static and dynamic magnetism. This fundamental interaction comes in two flavors – symmetric and antisymmetric. While the symmetric interaction leads to ferro- and antiferromagnetism, the antisymmetric interaction has attracted significant interest owing to its…
20201120 Coherent control of field gradient induced quantum dot spin qubits
“Coherent control of field gradient induced quantum dot spin qubits” Dr. Dohun Kim Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University Nov. 20 (Fri.), 04:00 PM Online seminar https://kaist.zoom.us/j/82243139535 회의 ID: 822 4313 9535 암호: 151742 Abstract: The electron spin degree of freedom in solids form natural basis for constructing quantum two level systems, or qubits. The electron spin qubit offers a route for fast…
20201120 Lumpy Cooper pairs in an iron-based superconductor
“Lumpy Cooper pairs in an iron-based superconductor” Dr. Doohee Cho Department of Physics, Yonsei University Nov. 20 (Fri.), 02:30 PM Online seminar https://kaist.zoom.us/j/82243139535 회의 ID: 822 4313 9535 암호: 151742 Abstract: Cooper pairs can tunnel through the vacuum barrier between two superconducting electrodes, known as a Josephson junction. One can extract the superconducting order parameter from the current-voltage curves close to zero bias. We use atomic-resolution Josephson scanning tunneling microscopy…
20201016 Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern
“Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern” Dr. Daesu Lee Department of Physics, POSTECH Oct. 16 (Fri.), 04:00 PM Online seminar Abstract: Nonequilibrium atomic structures can host exotic and technologically relevant properties in otherwise conventional materials. Oxygen octahedral rotation forms a fundamental atomic distortion in perovskite oxides, but only a few patterns are predominantly present at equilibrium. This has restricted the range of possible properties…