BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:PChem Seminar - Karl-Heinz Ernst
DTSTART:20261022T170000
DTEND:20261022T190000
DTSTAMP:20261005T052253Z
UID:1eb8c9942b9235401b700e1bbc2d7ce6363440d84c5f92b5db045c00
CATEGORIES:Conferences - Seminars
DESCRIPTION:Karl-Heinz Ernst (EMPA)\nChirality Meets Magnetism: Spin Selec
 tivity and Molecular Organization\n\nSince Pasteur's discovery of molecula
 r chirality\, understanding how molecular handedness couples to its physic
 al environment has remained a fundamental challenge. Of particular interes
 t is its interplay with magnetism\, anticipated already by Pierre Curie in
  1894\, as well as the emergence and propagation of chirality through mole
 cular organization. Here\, we explore these connections at surfaces\, from
  the interaction of individual chiral molecules with magnetic substrates a
 nd spin-polarized electrons to the collective organization of molecular ch
 irality in extended two-dimensional structures. First\, we demonstrate ena
 ntioselective adsorption of individual helicene molecules on ferromagnetic
  cobalt surfaces. Spin- and chirality-resolved scanning tunneling microsco
 py reveals that left- and right-handed helicenes preferentially adsorb on 
 Co islands with opposite out-of-plane magnetization\, establishing a direc
 t correlation between molecular handedness and substrate magnetization. Se
 cond\, tunneling-conductance measurements through individual enantiomers r
 eveal magnetochiral asymmetries of up to 50%\, demonstrating spin-selectiv
 e electron transport at the single-molecule level and excluding ensemble e
 ffects as the sole origin of chirality-induced spin selectivity (CISS). Fi
 nally\, we report the first observation of aperiodic chiral molecular tili
 ng arising from topological self-assembly on a silver surface\, demonstrat
 ing how molecular chirality can propagate from individual building blocks 
 into complex collective organization.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR