20191101 Electron transport through weak-bonded contact metal with low dimensional nano-material

“Electron transport through weak-bonded contact metal with low dimensional nanomaterial” Dr. Ju-Jin Kim Department of Physics, Jeonbuk National University Nov. 1 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: The electrical properties of low-dimensional nano-materials such as carbon nanotube, graphene, layered materials can be effectively tuned by varying the Fermi level pinning position to the metal electrode without conventional substitutional doping. By changing the work function of metal electrode widely,…

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20191101 Squeezing the best out of 2D materials

“Squeezing the best out of 2D materials” Dr. YoungWook Kim Department of Emergent Materials Science, DGIST Nov. 1 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: The study of two dimensional electron systems with extraordinarily low levels of disorder was for a long time the exclusive privilege of the epitaxial thin film research community. The successful isolation of graphene by mechanical exfoliation has, however, been truly disruptive. Furthermore, the assembly…

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20190927 0D/1D/2D/3D III-V materials grown by MBE for Optelectronics

“0D/1D/2D/3D III-V materials grown by MBE for Optelectronics” Dr. Jindong Song Center for Opto-Electronic Convergence Systems, KIST Sep. 27 (Fri.), 04:00 PM E6-2. 1st fl. #1323 In KIST, 8 (+1) MBE systems are installed for the study of low dimensional structures. With the MBEs, we are in the middle of studying; As/P/Sb-based materials with new properties, High speed III-V 2DEGs/2DHG for physics (mesoscopic physics, Topo. Insul. etc), high speed (>…

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20190927 Spin-charge conversion in topological insulators for spintronic applications

“Spin-charge conversion in topological insulators for spintronic applications” Dr. Joon Sue Lee University of Tennessee, Incoming Assistant Professor in Physics Sep. 27 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: Surface states of topological insulators (TIs) are characterized by a helical spin texture in momentum space. The spin texture has been demonstrated by spin- and angle-resolve photoemission spectroscopy, and the current-induced spin polarization in the surface states has been detected…

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20190910 Two-Stage Kondo Effect

“Two-Stage Kondo Effect” Dr. Mikhail Kiselev The Abdus Salam International Centre for Theoretical Physics (ICTP) Sep. 10 (Tue.), 03:00 PM E6-2. 1st fl. #1323 Abstract: We consider a quantum dot with K>1 orbital levels occupied by two electrons connected to two electric terminals. The generic model is given by a multilevel Anderson Hamiltonian. The weak-coupling theory at the particle-hole symmetric point is governed by a two-channel S=1 Kondo model characterized…

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20190731 Features of ballistic superconducting graphene

“Features of ballistic superconducting graphene” Dr. Ivan Borzenets Physics Department, City University of Hong Kong Jul. 31 (Wed.), 04:00 PM E6-2. 1st fl. #1323 Abstract: Achieving superconducting contacts to ultra-clean graphene results in ballistic Josephson junctions. Such devices have opened up several possibilities in realizing novel topological states and has proposed applications in Quantum Information. Namely, under high magnetic fields, combining several superconducting edge states can result in formation of…

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20190624 Topological photonic anomalies

“Topological photonic anomalies” Dr. Henning Schomerus Condensed Matter Theory, Lancaster University Jun. 24 (Mon.), 11:00 AM E6-2. 1st fl. #1323 Abstract: Quantum anomalies arise from topological states with distinct properties that typically are probed by external fields. Here I describe how such anomalous properties can be directly observed in photonic systems, including lasers [1,2,3], exciton polaritoncondensates [4] and supersymmetric discrete-time quantum walks [5]. [1] Topologically protected midgap states in complex…

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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…

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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…

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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…

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