Institute of Physics, Johannes Gutenberg-University Mainz, Germany

报告摘要：

Intertwined order parameters are ubiquituos to advanced quantum solids, with the interplay between the different degrees of freedom (charge, spin, lattice) being responsible for their functional properties. Real-time femtosecond techniques^1-5 offer means to investigate the coupling strengths between the different degrees of freedoms as well as their manipulation,^5-8 that may lead to light-induced metastable states.^5-9 Charge density wave (CDW) systems present a prototype system with a coupled electronic and lattice orders, and have been extensively studied by different ultrafast spectroscopic methods.^1-6 Here, I will first focus on the order parameter dynamics in a prototype quasi one-dimensional Peierls CDW system K_0.3MoO₃, and address recent studies of an unconventional CDW order in BaNi₂As₂.¹⁰

[1] H. Sch？fer, et al., Phys. Rev. Lett. 105, 066402 (2010).

[2] M. Eichberger, et al., Nature 468, 799 (2010).

[3] F. Schmitt, et al., Science 321, 1649 (2008).

[4] T. Rohwer, et al., Nature 471, 490 (2011).

[5] T. Huber, et al., Phys. Rev. Lett. 113, 026401 (2014).

[6] L. Stojchevska, et al., Science 344, 177 (2014).

[7] K. W. Kim, et al., Nature Materials 11, 497 (2012).

[8] M. Mitrano, et al., Nature 530, 461 (2016).

[9] F. Pressacco, et al., Nature Communications 12, 5088 (2021).

[10] A.R. Pokharel, et al., arxiv:2102.09926
 

报告人简介：

Dr. Jure Demsar is a Professor of experimental solid state physics at the Johannes Gutenberg-University Mainz. His group focuses on real-time spectroscopy and manipulation of symmetry-broken ground states, using lab-based time-resolved techniques like broad-band optical spectroscopy, electron diffraction and THz spectroscopy, and is involved in experiments at large-scale facilities using intense narrow band THz excitation, time-resolved photoelectron spectroscopy, and X-ray diffraction. The group focuses on nonequilibrium phenomena in superconductors, interplay of superconductivity with competing orders, dynamics and photoinduced phase transitions in density wave systems, correlations in heavy-electron systems, optical manipulation of antiferromagnets, and has been heavily involved implementing new data-acquisition and analysis approaches in time-resolved momentum microscopy.

腾讯会议：343-280-968

邀请人：赵继民  研究员（9503）

联系人：张  萃  副研究员（8609）