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SUMMARY:Tracking Spin and Orbital Dynamics in Magnetic Heterostructures by
  Spintronic Terahertz Emission Spectroscopy
DTSTART:20261021T060000Z
DTEND:20261021T070000Z
DTSTAMP:20261105T163200Z
UID:indico-event-5381@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Zhensheng Tao（陶镇生） (Fudan University)\n\nH
 ost: Prof. Tao Dong  \nVenue: TDLI Meeting Room N400\nTencent Meeting l
 ink:  https://meeting.tencent.com/dm/INCgkS8N5iL1 \nMeeting ID: 794670601
 \, no password\n \n \nAbstract:\nOrbitronics – the generation\, transp
 ort\, and conversion of orbital angular momentum (OAM) – has emerged as 
 a frontier complementing spintronics\, opening new routes to high-efficien
 cy\, charge-current-free information carriers. Spintronic terahertz emissi
 on spectroscopy provides a powerful tool for probing ultrafast spin and or
 bital angular momentum dynamics in magnetic heterostructures. In this talk
 \, I will present our recent efforts to disentangle spin and orbital contr
 ibutions to terahertz emission and reveal their distinct transport and pum
 ping behaviors. We find that the orbital diffusion length in heavy metals 
 is substantially shorter than the spin diffusion length\, in contrast to p
 revious interpretations. By quantitatively separating spin- and orbital-cu
 rrent-induced signals\, we further determine the relative efficiencies of 
 orbital and spin pumping in 3d transition-metal ferromagnets\, enabling di
 rect comparison with microscopic theories. Finally\, we identify evidence 
 for orbital-current injection in RuO2\, a candidate altermagnetic material
 \, highlighting the importance of orbital contributions for correctly inte
 rpreting terahertz signatures associated with its unconventional magnetic 
 order.\n \nBiography:\nProf. Zhensheng Tao is a Professor of Physics at F
 udan University. He received his Ph.D. from Michigan State University in 2
 014\, where he developed ultrafast electron microscopy for studying strong
 ly correlated materials. He then worked as a Research Associate at JILA\, 
 University of Colorado Boulder\, with Prof. Margaret Murnane and Henry Kap
 teyn\, focusing on attosecond science and ultrafast dynamics in condensed 
 matter. In 2018\, he joined Fudan University as a Professor. He is also a 
 recipient of China's "Youth Thousand Talents" Program and the Shanghai "Or
 iental Scholar" Distinguished Professorship. His research focuses on ultra
 fast optics\, attosecond science\, terahertz spintronics\, and probing ele
 ctron dynamics in quantum materials.\n\nhttps://indico-tdli.sjtu.edu.cn/ev
 ent/5381/
LOCATION:Tsung-Dao Lee Institute/N4F-N400 - meeting room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5381/
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