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SUMMARY:Kondo and beyond – recent insight from scanning probe measuremen
 ts
DTSTART:20261013T053000Z
DTEND:20261013T073000Z
DTSTAMP:20261015T060000Z
UID:indico-event-218@indico.phys.nthu.edu.tw
DESCRIPTION:Speakers: Matthias Bode\n\nThe electron spin\, a fundamental q
 uantum mechanical property\, plays a crucial role in determining the elect
 ronic and magnetic properties as well as the dynamics of matter. In magnet
 ic materials\, magnons represent the elementary excitations of a macroscop
 ically ordered ground-state spin configuration. These excitations allow th
 e transfer of spin angular momentum without involving charge transport. Sp
 in excitations\, in general\, are essential for understanding magnetic-bit
  manipulations\, defining the associated lifetimes\, relaxation times\, re
 ad and write times\, and dissipation. Therefore\, a fundamental understand
 ing of spin excitations is significant for both fundamental science and mo
 dern applications.\nRecent first-principles calculations predicted the exi
 stence of many-body states [1]\, called spinarons\, a magnetic polaron th
 at arises from the interaction of spin excitations with conduction electro
 ns in the presence of spin-orbit coupling. These results challenge the dec
 ades-old Kondo effect paradigm\, which was previously believed to emerge i
 n Co atoms on the (111) surface of noble metals.\nI will present experimen
 tal evidence for the existence of spinaronic states in Co atoms on the Cu(
 111) surface. Our spin-averaged and spin-polarized scanning tunnelling spe
 ctroscopy measurements in high magnetic fields allow us to discriminate be
 tween the different existing theoretical models and to invalidate the prev
 ailing Kondo-based interpretation of the zero-bias anomaly. Ab initio calc
 ulations instead suggest the presence of multiple spinaronic states.\n \n
 \nFigure: (a) Topographic scan of the Cu(111) surface with adsorbed Co ato
 ms. The standing wave pattern formed by Friedel oscillations of the Cu(111
 ) surface state is visible. Scale bar is 10 nm. (b) dI/dU spectrum recorde
 d atop a single Co atom (black curve) fitted with a Fano curve (red line).
  The fit was performed in the range of (−10\, +10) mV. (c) dI/dU spectra
  taken atop a single Co atom in an out-of-plane external magnetic field of
  up to 12 T. The gray arrow indicates the appearance of a kink in the risi
 ng edge of the ZBA at high magnetic fields (T= 1.4 K). (d) Numerically\n[1
 ] Bouaziz et al.\, Nat. Commun. 11\, 6112 (2020)\n\nhttps://indico.phys.nt
 hu.edu.tw/event/218/
LOCATION:Physics/019 (NTHU)
URL:https://indico.phys.nthu.edu.tw/event/218/
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