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X-WR-CALNAME:SNR Seminars & Discussions
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BEGIN:VEVENT
DTSTART:20250122T220000Z
UID:186329@events.unl.edu
DTSTAMP:20250106T194127Z
ORGANIZER;CN=Nebraska Center for Materials and Nanoscience:
SUMMARY:Seminar w/ Junwei Liu
STATUS:CONFIRMED
DESCRIPTION:Abstract\:\nI will talk about the novel properties due to cryst
 al symmetry spin-splitting antiferromagnets (AFMs) [Nat. Commun. 12\, 2846
  (2021)] (named as altermagnet in 2022) and in topological superconductor 
 [Nature 633\, 71 (2024)].\n\nIn spin-splitting AFMs\, we propose the cryst
 al-symmetry-paired spin-valley/momentum locking (CSVL/CSML)\, which is ena
 bled by a crystal symmetry and intrinsically exists in AFMs (e.g.\, V2Se2O
 \, V2Te2O\, MnTe and RuO2) [Nat. Commun. 12\, 2846 (2021)]. CSML enables f
 easible controls of spin in AFMs by manipulating the corresponding crystal
  symmetry. Typically\, one can use a strain field to induce net valley pol
 arization/magnetization and use an electric field to generate a noncolline
 ar spin current even without spin-orbit coupling. All the predictions have
  been confirmed in experiments [arXiv\:2407.19555\; arXiv\:2408.00320]. Th
 ese properties have helped us realize the electric readout and 180o determ
 inistic switching of the Néel order in our experimental work in Mn5Si3 [S
 ci. Adv. 10\, eadn0479 (2024)] and CrSb [arXiv\:2403.07396 Nature (accepte
 d)].\n\nIn topological superconductors\, magnetic mirror symmetry can prot
 ect multiple Majorana zero modes (MZMs) in a single vortex\, which allows 
 feasible controls of hybridization of MZMs simply using an external field.
  This has been realized in our recent collaborative experimental works wit
 h Prof Jin-Feng Jia’s group [Nature 633\, 71 (2024)\; Quantum Frontiers 
 3\, 20 (2024)]. Similar properties can also be realized in superconducting
  CSVL/CSML materials.\n\nBio\:\nProf. Junwei Liu obtained his PhD at Tsing
 hua University in 2014 and then did his postdoctoral research at MIT. He j
 oined HKUST in 2017 as an assistant professor and was promoted to an assoc
 iate professor in 2023.\n\nProf. Liu has a broad interest in condensed mat
 ter physics and quantum physics\, varying from the traditional phenomena l
 ike ferroelectricity to the exotic topological phases like quantum spin Ha
 ll insulators. His major contributions include (1) theoretical prediction 
 of SnTe-type topological crystalline insulator\, WTe2-type and TaIrTe4-typ
 e quantum spin Hall insulator\; (2) discovery of world-first monolayer fer
 roelectricity in SnTe thin films\; (3) proposal of self-learning Monte Car
 lo methods that can be thousands of times faster than conventional methods
  without loss of any accuracy\; (4) design and realization of the world-fi
 rst all-optical neural networks\; and (5) proposal of crystal-symmetry-pai
 red spin-valley locking and realization of world-first electrical readout 
 and 180° switching of the Néel order in spin-splitting antiferromagnetic
  materials. He has published more than 60 papers including 2 in Science\, 
 2 in Nature\, 1 in Nat. Phys.\, 3 in Nat. Mater.\, 7 in Nat. Commun.\, 3 i
 n Phys. Rev. Lett.\, etc
LOCATION:Jorgensen Hall Room 110
URL://events.unl.edu/SNR_Seminar/2025/01/22/186329/
DTEND:20250122T230000Z
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