学术报告
题目: [纳米物理与器件实验室系列学术报告（44）] Computational Studies of Two-Dimensional Materials: From Graphene to Few-Layer Graphene and Beyond
时间: 2013年10月30日 15:00
地点: 物理所M楼253会议室
报告人: 周美吟
台湾中央研究院原子与分子科学研究所特聘研究员兼所长
联系人：杜世萱研究员（82649823）
It has become possible in recent years to fabricate and manipulate two-dimensional (2D) nanomaterials in the laboratory that are as thin as one to few atomic layers. A well-known example is graphene, where the Dirac-Weyl Hamiltonian for massless fermions describes the low-energy quasiparticles. Intriguing physics has been found in these few-layer systems, and phenomena originally associated with particle physics can now be observed in condensed matter systems. In this talk, I will focus on our recent computational studies of a few representative systems, including the neutrino-like oscillation and anisotropic transport [1] in twisted bilayer graphene that also exhibits a rare fractal-like “butterfly” energy spectrum under external magnetic field [2]. In addition, I will also discuss the possibility of growing 2D structures of other group-IV elements on graphene. It is expected that many of the unique electronic properties of graphene can also be realized in this new 2D system. We have performed first-principles calculations of silicene on graphene [3] in order to understand the effect of substrate interaction on the physical properties of these systems. The phonon properties and electron-phonon interaction of freestanding silicene [4] will also be discussed.
Acknowledgments: This work is in collaboration with Lede Xian, Zhengfei Wang, Chih-Piao Chuu, Yongmao Cai, Jia-An Yan, and Ching-Ming Wei.
References:
[1] L. Xian, Z. F. Wang, and M. Y. Chou, Nano Lett. (in press, DOI: 10.1021/nl4024403).
[2] Z. F. Wang, F. Liu, and M. Y. Chou, Nano Lett. 12, 3833 (2012).
[3] Y. Cai, C.-P. Chuu, C. M. Wei, and M. Y. Chou, Phys. Rev. B (submitted).
[4] J.-A. Yan, R. Stein, D. M. Schaefer, X.-Q. Wang, and M. Y. Chou, Phys. Rev. B (Rapid Communications) 88, 121403 (2013).
报告人简介：
Mei-Yin Chou is an expert in theoretical condensed matter physics; Electronic and structural properties of solids, surfaces, interfaces, and clusters; Computational materials physics. Presently, Director and Distinguished Research Fellow, Institute of Atomic and Molecular Sciences, Academia Sinica, Taiwan; Professor, School of Physics, Georgia Institute of Technology, and Adjunct Professor, Department of Physics, National Taiwan University. PhD 1986 in Physics, University of California, Berkeley. ADVANCE Professor of Science, Georgia Institute of Technology from 2002 to 2006. 2005-2010, Chair, School of Physics, Georgia Institute of Technology.Her research resulted in nearly 140 publications published on PRL, Nano Lett., PRB etc. Received Outstanding Taiwan Woman Scientist Award(2013), College of Sciences Ralph and Jewel Gretzinger Moving Forward School Award(2009), and American Physical Society Fellow (2002) etc. Chou serves as referees for Science, PRL, PR and National Science Foundation, Department of Energy. She also serves as chair and co-chair for abound of scientific meetings like Gordon Research Conference
联系人：杜世萱研究员（82649823）
It has become possible in recent years to fabricate and manipulate two-dimensional (2D) nanomaterials in the laboratory that are as thin as one to few atomic layers. A well-known example is graphene, where the Dirac-Weyl Hamiltonian for massless fermions describes the low-energy quasiparticles. Intriguing physics has been found in these few-layer systems, and phenomena originally associated with particle physics can now be observed in condensed matter systems. In this talk, I will focus on our recent computational studies of a few representative systems, including the neutrino-like oscillation and anisotropic transport [1] in twisted bilayer graphene that also exhibits a rare fractal-like “butterfly” energy spectrum under external magnetic field [2]. In addition, I will also discuss the possibility of growing 2D structures of other group-IV elements on graphene. It is expected that many of the unique electronic properties of graphene can also be realized in this new 2D system. We have performed first-principles calculations of silicene on graphene [3] in order to understand the effect of substrate interaction on the physical properties of these systems. The phonon properties and electron-phonon interaction of freestanding silicene [4] will also be discussed.
Acknowledgments: This work is in collaboration with Lede Xian, Zhengfei Wang, Chih-Piao Chuu, Yongmao Cai, Jia-An Yan, and Ching-Ming Wei.
References:
[1] L. Xian, Z. F. Wang, and M. Y. Chou, Nano Lett. (in press, DOI: 10.1021/nl4024403).
[2] Z. F. Wang, F. Liu, and M. Y. Chou, Nano Lett. 12, 3833 (2012).
[3] Y. Cai, C.-P. Chuu, C. M. Wei, and M. Y. Chou, Phys. Rev. B (submitted).
[4] J.-A. Yan, R. Stein, D. M. Schaefer, X.-Q. Wang, and M. Y. Chou, Phys. Rev. B (Rapid Communications) 88, 121403 (2013).
报告人简介：
Mei-Yin Chou is an expert in theoretical condensed matter physics; Electronic and structural properties of solids, surfaces, interfaces, and clusters; Computational materials physics. Presently, Director and Distinguished Research Fellow, Institute of Atomic and Molecular Sciences, Academia Sinica, Taiwan; Professor, School of Physics, Georgia Institute of Technology, and Adjunct Professor, Department of Physics, National Taiwan University. PhD 1986 in Physics, University of California, Berkeley. ADVANCE Professor of Science, Georgia Institute of Technology from 2002 to 2006. 2005-2010, Chair, School of Physics, Georgia Institute of Technology.Her research resulted in nearly 140 publications published on PRL, Nano Lett., PRB etc. Received Outstanding Taiwan Woman Scientist Award(2013), College of Sciences Ralph and Jewel Gretzinger Moving Forward School Award(2009), and American Physical Society Fellow (2002) etc. Chou serves as referees for Science, PRL, PR and National Science Foundation, Department of Energy. She also serves as chair and co-chair for abound of scientific meetings like Gordon Research Conference