발표연사 ▶▶▶

부문 Track
성명 Hosung Seo, Assistant Professor in Physics
소속 Department of Physics, Pusan National University, Busan, 46241 Korea
주제 First-principles theory of defect-based qubits in heterogeneous semiconductors
학력 2006, B.S. in Physics, Seoul National University, Seoul, Korea
2008, M.S. in Physics, Northwestern University, USA
2013, Ph.D. in Physics, The University of Texas at Austin, USA
경력 2013 – 2014, Postdoctroal Fellow, University of California, Davis
2014 – 2017, Postdoctoral Fellow, University of Chicago
2017 – present, Assistant Professor, Ajou University, Korea
요약 In recent years, remarkable advances have been achieved in the development of defect-based spin quantum bits (qubits) in semiconductors for solid-state quantum information science and technology. Promising spin qubits include the nitrogen-vacancy center in diamond, dopants in silicon, and the silicon vacancy and vacancy-derived spins in silicon carbide. In this talk, I will highlight some of our recent efforts devoted to defect spin qubits in wide-gap heterogeneous semiconductors. In the first part of the talk, I will explain basic concepts of using point defects in semiconductors as qubits and their quantum applications. Then, I will describe our recent result on first-principles computational design of new spin defects for use as qubits in piezoelectric crystals such as AlN and SiC. I will also discuss opportunities and recent results on quantum defects found in 2-dimensional van der Waals materials systems. In particular, I will present our recent combined experimental and theoretical study on Stark tuning of single photon emitters in h-BN/graphene heterostructure and also a theoretical study on quantum decoherence in 2-dimensional worlds. I will conclude my talk by discussing a perspective of combining density functional theory and cluster correlation expansion calculations to predict not only the thermodynamic and electronic properties of defect qubits, but their coherent quantum properties from first-principles.