20181207 Spin generation from heat and light in metals
“Spin generation from heat and light in metals” Dr. Gyung Min Choi Department of Energy Science, Sungkyunkwan University Dec. 7 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: Manipulating magnetization by a spin current rather than a magnetic field is a fundamental issue in spintronics. Conventionally, spin currents have been generated from charge currents by spin filter effect or spin Hall effect. In this seminar, I will show that spin…
20181121 Engineering topological quantum physics at the atomic scale
“Engineering topological quantum physics at the atomic scale” Dr. Seongshik Oh Department of Physics and Astronomy, Rutgers, the State University of New Jersey Nov. 21 (Wed.), 03:00 PM E6-2. 1st fl. #1323 Abstract: Since the notion of topological insulator (TI) was envisioned about a decade ago, topology has become a new paradigm in condensed matter physics. Realization of topology as a generic property of materials has led to numerous predictions…
20181109 Quantum sensing and imaging with diamond defect centers for nano-scale spin physics
“Quantum sensing and imaging with diamond defect centers for nano-scale spin physics” Dr. Donghun Lee Department of Physics, Korea University Nov. 9 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: Probing and imaging magnetism at nanometer scale with high field sensitivity is of great interest in a wide range of fields, including solid-state physics, materials science and biomedical applications. In this talk, I will introduce a novel scanning magnetometer based…
20181109 Moiré superlattices – from twisted bilayer graphene to quasicrystal
“Moiré superlattices – from twisted bilayer graphene to quasicrystal” Dr. Pilkyung Moon Arts and Sciences, New York University Shanghai Nov. 9 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: When two-dimensional atomic layers are stacked incommensurately, the interference between the two lattice arrangement leads to new order to the system. In this talk, I will discuss the impact of such order on the electronic properties of atomic layers ranging from…
20181012 Direct observation of a two-dimensional hole gas at oxide interfaces
“Direct observation of a two-dimensional hole gas at oxide interfaces” Dr. HyungWoo Lee Department of Physics, KAIST Oct. 12 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: Over the past decade, the discovery of a two-dimensional electron gas (2DEG) at the LaAlO3/SrTiO3 interface resulted in the observation of remarkable properties not present in conventional semiconductor heterostructures, and so become a focal point for device applications. Its counterpart, the two-dimensional hole…
20181012 Quantum Advantage in Learning Parity with Noise
“Quantum Advantage in Learning Parity with Noise” Dr. Daniel Kyungdeock Park School of Electrical Engineering, KAIST Oct. 12 (Fri.), 02:30 PM E6-2. 1st fl. #1323 Abstract: Experimental realizations of quantum information processing have made remarkable progress in the past decade. However, universal fault-tolerant quantum computation is still far from within reach. While efforts towards developing full-fledged quantum computers continue, identifying well-defined computational tasks for which less powerful but more realistic…
20180619 Entanglement Entropy in Many-Body Systems: Disorder and Symmetry
“Entanglement Entropy in Many-Body Systems: Disorder and Symmetry” Dr. Moshe Goldstein School of Physics and Astronomy, Tel Aviv University Jun. 19 (Tue.), 11:00 AM E6-2. 2nd fl. #2502 Abstract: Entanglement has recently emerged as a central theme in the study of many-body systems. In this talk I will discuss two novel aspects of this subject. The first is the use of entanglement to characterize disordered topological phases, in particular the…
20180618 Noise on complex quantum Hall edges
“Noise on complex quantum Hall edges” Dr. Jin Hong Park Department of Condensed Matter Physics, The Weizmann Institute of Science Jun. 18 (Mon.), 05:00 PM E6-2. 2nd fl. #2502 Abstract: Thermal transport through the edge of quantum Hall systems has been recently investigated since it reveals the topological property to which electron conductance cannot access. We show that noise of an electric current is a result of the interplay between…
20180601 Topological phases in low-dimensional quantum materials
“Topological phases in low-dimensional quantum materials” Dr. Seung Sae Hong Department of Applied Physics, Stanford University Jun. 01 (Fri.), 11:00 AM E6-2. 1st fl. #1323 Abstract: The concept of topology has been broadly applied to modern condensed matter physics. The talk will discuss how the materials in the reduced dimension offer new opportunities to observe topological effects in electronic and crystalline structures, with examples from two distinct quantum materials families…
20180511 암페어 단위 재정의와 단전자 펌프 소자 개발
“암페어 단위 재정의와 단전자 펌프 소자 개발” Dr. Nam Kim Korea Research Institute of Standards and Science May. 11 (Fri.), 04:00 PM E6-2. 1st fl. #1323 Abstract: 향후 재정의될 전류 단위 암페어를 실현하기 위해서 한국표준과학연구원(KRISS)에서 개발중인 단전자 펌프 소자에 대한 연구 결과를 발표하겠다. 단전자 펌프 소자는 Likharev에 의해서 1985년에 처음 제안되어서 실험적으로는 90년대 초에 금속 단전자 소자를 이용해서 시연되었다. 처음 제안되었을 때부터, 조셉슨 효과, 양자홀 효과, 단전자 효과 등의 3개의…