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关于10月10日Tilen Cadez报告的通知

编辑:phyjd 时间:2019年09月30日 访问次数:156

题目: Nodal loop Weyl semimetal in the presence of quasiperiodic potentials

报告人:Tilen Cadez, Center of Physics of University of Minho and University of Porto

地点: 教十二-201

时间: 1010日,周四,15:00-15:55

 

摘要:

In this seminar I will discuss the bulk phases of the three dimensional nodal loop Weyl semi-metal in the presence of a quasi-periodic (QP) potential. Using numerical techniques (exact diagonalization and the Kernel polynomial method), as well as an effective low energy Hamiltonian, we show that the ballistic semi-metal phase is robust to weak QP potentials. Upon increasing the potential, the ballistic semi-metal transitions into a diffusive metal, which is reflected in the behavior of the density of states, local ratios of adjacent gaps and by the multi-fractal analysis of the wave-functions. In this phase, the density of states becomes strongly modulated and develops a peak at zero energy,  the low energy levels display a quadratic level repulsion and the ground state wave-function shows a single fractal trend with a fractal dimension 3.  By further increasing the potential the system turns into a gapless insulator.

 

个人简介:

 

Tilen Cadez obtained his PhD from the University of Ljubljana, Slovenia in 2013. He was a Postdoctoral Fellow at the Beijing Computational Science Research Center (CSRC) between 2014-2019. Currently he is a visiting researcher at the Institute of Theoretical Physics, Chinese Academy of Sciences (ITP CAS). His research interests include: I) topological, II) disordered, III) driven and IV) one-dimensional strongly correlated systems.

欢迎老师和同学参加!