20190614 Emergent localized states at the interface of a twofold PT-symmetric lattice
“Emergent localized states at the interface of a twofold PT-symmetric lattice” Dr. Sang-Jun Choi Center of Theoretical PCS of the Institute for Basic Science Jun. 14 (Fri.), 05:00 PM E6-2. 2nd fl. #2501 Abstract: The emergence of topologically robust states has been understood in terms of the bulk-edge correspondence; they appear at the boundary between two insulating systems whose topology cannot be continuously deformed into another. However, is its converse…
20190531 Harnessing Mesoscopic Mechanical Systems for New Quantum Technologies
“Harnessing Mesoscopic Mechanical Systems for New Quantum Technologies” Dr. Sungkun Hong Department of Physics, KAIST May. 31 (Fri.), 05:00 PM E6-2. 1st fl. #1323 Abstract: Quantum optomechanics is an emerging field in quantum science that aims to control quantum motions of mechanical objects using light-matter interactions. In recent years, the researchers started gaining quantum control over several mesoscopic mechanical systems. This advancement opens exciting possibilities for developing new quantum technologies…
20190531 Flatbands in twisted Dirac materials
“Flatbands in twisted Dirac materials” Dr. Jeil Jung Department of Physics, University of Seoul May. 31 (Fri.), 03:45 PM E6-2. 1st fl. #1323 Abstract: Twisted bilayer graphene is gaining a renewed interest after recent experimental observation of superconductivity associated with the narrow bandwidth ‘flatbands’ attainable at appropriate twist angles and pressure tunable interlayer coupling. In this presentation I will introduce a method to obtain the continuum moire bands Hamiltonian of…
20190531 Stiefel-Whitney classes and topological phases in condensed matter
“Stiefel-Whitney classes and topological phases in condensed matter” Dr. Bohm-Jung Yang Department of Physics and Astronomy, Seoul National University May. 31 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: I am going to talk about novel topological properties of spinless fermions systems with space time inversion IST symmetry, which is basically a combination of time-reversal symmetry with additional inversion or two-fold rotation symmetry. In three dimensions, the band topology of…
20190419 Graphene and hBN heterostructures
“Graphene and hBN heterostructures” Dr. Seok Kyun Son Department of Physics, Mokpo National University Apr. 19 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: The concept of van der Waals heterostructures has led to a new technology of layer-by-layer engineering of two-dimensional (2D) materials with atomic precision. Out of the abundance of 2D materials, the two – graphene and hexagonal boron nitride (hBN), still remain the most unique couple, because…
20190419 A family of finite-temperature electronic phase transitions in graphene multilayers
“A family of finite-temperature electronic phase transitions in graphene multilayers” Dr. YoungWoo Nam Department of Physics, Gyeongsang National University Apr. 19 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: It has been shown that electron-electron interactions (e-e) in Bernal-stacked multilayer graphene play a prominent role, leading the system into a gapped state at B = 0 for even-layered devices up to 8 layers. However, the origin of this state remains…
20190329 Coherent Quantum Control and Magnetism on atoms – Trapped ion and ESR STM
“Coherent Quantum Control and Magnetism on atoms – Trapped ion and ESR STM” Dr. Taeyoung Choi Department of Physics, Ewha Womans University Mar. 29 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: Understanding, controlling, and utilizing nanoscale quantum systems have been one of major research interests across fields of physics, chemistry, and material science. In atomic molecular optics (AMO) physics, the ultracold trapped ion system has been one of leading…
20190329 Epitaxial Multifunctional Oxide Thin Films for Novel Electronics
“Epitaxial Multifunctional Oxide Thin Films for Novel Electronics” Dr. Seung Hyub Baek Center for Electronic Materials, KIST Mar. 29 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: Epitaxial heterostructures of complex oxides have attracted much attention due to their enormous range of electrical, magnetic and optical properties. For example, metallic conductors, dielectrics, ferroelectrics, piezoelectrics, semiconductors, ferromagnetics, superconductors, non-linear optics and multiferroics have been demonstrated in perovskite oxides. Moreover, novel phenomena…
20181226 Brane-like defect in 3D toric code
“Brane-like defect in 3D toric code” Dr. Isaac H. Kim Stanford Institute for Theoretical Physics Dec. 26 (Wed.), 04:00 PM E6-2. 1st fl. #1323 Abstract: We construct a new type of defect in the 3D toric code model. This model only has point-like and closed string-like excitations, but one can construct open string-like excitations by introducing this defect. The open string can end on the defect, and it can be…
20181207 Novel probes of interacting electrons in 2D systems
“Novel probes of interacting electrons in 2D systems” Dr. Joon Ho Jang Department of Physics and Astronomy, Seoul National University Dec. 7 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: The multitude of emergent phases in the quantum Hall (QH) and superconducting (SC) regime that develop from the dominant electron-electron interactions have fascinated researchers for decades. While traditional transport measurements have played monumental roles in initially discovering many of the…