教授

个人信息简介

姓名:宋筠
学历:博士
职称:教授
职务:博士生导师

地址:北京市海淀区新街口外大街19

邮编:100875

传真:010-58800141

E-mailyunsong@bnu.edu.cn

教育经历

学士学位:复旦大学物理系

博士和硕士学位:北京师范大学物理学系

工作经历

1996年至今:北京师范大学物理学系,教师

1997-1998:香港中文大学物理系,博士后

2005-2007:Department of Physics and Astronomy, Trent University, Canada, Postdoctoral Research Fellow

研究兴趣

1.强关联体系是凝聚态物理领域中被大家所公认的一个最为复杂和最具有挑战性的研究领域,它涉及到大量的新奇而有趣的物理现象并具有非常丰富的物理涵。该领域的理论研究往往与实验研究密切关联,所涉及到的材料主要包括高温铜氧化物超导体(Patrick A Lee, From high temperature superconductivity to quantum spin liquid: progress in strong correlation physics, Rep. Prog. Phys. 71, 012501 (2008))和铁基超导体(G. R. Stewart, Superconductivity in iorn compounds, Rev. Mod.Phys. 83, 1589 (2011))等。我们利用数值方法来研究掺杂过程所引入的杂质无序对上述强关联体系的物理性质的影响,并关注由无序所诱导的Anderson-缘体转变(E. Abrahams, 50 years of Anderson localization, World Scientific, 2010)与强相互作用所导致的Mott金属-绝缘体转变(M. Imada etal., Metal-insulator transitions, Rev. Mod. Phys. 70, 1039 (1998))如何来共同构建出全景相图等重要的基本物理问题。

2.在钙钛矿结构过渡族金属氧化物强关联体系中,自旋序、电荷序、轨道序和晶格结构序等的共同作用可以使得体系呈现出许多不同的电子状态和丰富多彩的物理性质(M. B. Salamon and M. Jaime, The physics of manganites: Structure and transport, Rev. Mod. Phys. 73, 583 (2001)),因此近年来人们对轨道自由度能够引起哪些新奇的物理现象非常关注,例如有轨道选择的金属-绝缘体转变(V. I. Anisimov, et al., Eur. Phys. J. B 25, 191 (2002))和轨道序等。动力学平均场理论(A. Georges, et al., Dynamical mean-field theory of strongly correlated fermion systems and the limit of infinite dimensions, Rev. Mod. Phys. 68, 13 (1996); G. Kotliar, et al., Electronic structure calculations with dynamical mean-field theory, Rev. Mod. Phys. 78, 865 (2006); T. Maier, et al., Quantum cluster theories, Rev. Mod. Phys. 77, 1027 (2005)是近几年针对强关联体系而发展起来的一套非常成功的数值方法。我们将发展这一方法来研究多能带强关联体系中的巡游磁性和量子相变等问题。

3.其它一些感兴趣的研究方向:新型二维材料(石墨烯、范德瓦尔斯磁性材料和过渡金属硫族化合物等)的新奇物性及无序效应的理论研究。


承担课程

本科生:数学物理方法、固体物理、超导物理

研究生:固体理论、群论及其在固体物理中的应用

科研项目

国家自然科学基金面上项目,异质界面中的量子相变和无序效应的动力学平均场理论研究(11474023

国家自然科学基金面上项目,对多轨道关联材料中的量子相变和巡游磁性的理论研究(11174036

科技部973项目子课题,高温超导的理论和计算(2011CB00108

国家自然科学基金面上项目,非常规超导体中杂质的无序效应的动力学平均场研究(10974018

代表论文

1. Yuekun Niu, et al., Quantitative determination of the orbital-selective Mott transition and quantumentanglement in the orbital-selective Mott phase, Physical Review B 110, 045131 (2024) (http://doi.org/10.1103/PhysRevB.110.045131) 

2. Bin Wei, et al., Strain-engineered magnon states in two-dimensional ferromagnetic monolayers, Physical Review Research 6, 013210 (2024) (http://doi.org/10.1103/PhysRevResearch.6.013210)

3. Dongqi Luo, et al., Lattice strain effects on the finite-temperature magnetism of two-dimensional single-layer CrI3, Physical Review B 108, 094432 (2023) (http://doi.org/10.1103/PhysRevB.108.094432)

4. Yu Ni, et al., Electronic correlation-driven orbital polarization transitions in the orbital-selective Mott compound Ba2CuO4−δ, Physcal Review B 103, 214510 (2021) (http://doi.org/10.1103/PhysRevB.103.214510)

5. Yuekun Niu, et al., Doublon-holon excitations split by Hund’s rule coupling within the orbital-selective Mott phase, Physical Review B 100, 075158 (2019) (http://doi.org/10.1103/PhysRevB.100.075158)

6. Zhao Yang-Yang. et al., Anderson localization effect on Mott phase in 1T-TaS2, Acta Physica Sinica, 66, 057101 (2017) (http://dx.doi.org/10.7498/aps.66.057101)

7. Jian Sun, et al., Disorder driven superconductor-insulator transition in inhomogeneous d-wave superconductor, Science China-Physics, Mechanics & Astronomy 59, 617401 (2016) (https://link.springer.com/article/10.1007/s11433-015-5713-4)

8. Yang Liu, et al., Localization and orbital selectivity in iron-based superconductors with Cu substitution, Physical Review B 92, 155146 (2015) (http://doi.org/10.1103/PhysRevB.92.155146)

9. Zhuoling Jiang, et al., Band gap oscillation and novel transport property in ultrathin chiral graphene nanoribbons, Physica B 464, 61 (2015) (http://doi.org/10.1016/j.physb.2015.02.003)

10. Long He, et al., Self-consistent calculations of the effects of disorder in d-wave and s-wave superconductors, J. Korean Phys. Soc. 63, 2223 (2013) (https://link.springer.com/article/10.3938%2Fjkps.62.2223)

11. Yun Song, et al.The effects of disorder and interactions on the Anderson transition in doped graphene, J. Phys.: Condens. Matter 23, 205501 (2011) (http://iopscience.iop.org/0953-8984/23/20/205501)

12. Yun Song, et al., Dynamical mean field study of the two-dimensional disordered Hubbard model, Physical Review B 77, 054202 (2008) (http://doi.org/10.1103/PhysRevB.77.054202)

13. Yun Song, et al., Geometrically Averaged Density of States as a Measure of Localization, Physical Review B 76, 045105 (2007) (http://doi.org/10.1103/PhysRevB.76.045105)