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BEGIN:VEVENT
DTSTAMP:20260623T122636Z
DTSTART;VALUE=DATE-TIME:20181213T130000
DTEND;VALUE=DATE-TIME:20181213T140000
SUMMARY:Theory Seminar: Manuel dos Santos Dias (Forschungszentrum Jülich)
 \, Spin interactions\, excitations and fluctuations in magnetic adatoms 
 and small clusters from first principles
TZID:Europe/London
UID:20181213-8a1785d765e801f30166201a89b90d17@warwick.ac.uk
CREATED:20181004T134525Z
DESCRIPTION:Single atoms are the smallest possible magnets\, of interest 
 for fundamental physics and of great promise for technological applicati
 ons. When assembled on a surface\, their properties can be probed and ma
 nipulated via scanning tunneling microscopy (STM) and inelastic scanning
  tunneling spectroscopy (ISTS). However\, the theoretical description is
  challenging\, due to the interplay between the reduced dimensionality\,
  the interactions driving the magnetism\, and the coupling to the surfac
 e. Furthermore\, an accurate description of the low-energy physics due t
 o the spin-orbit interaction and external magnetic fields is essential. 
 In Jülich\, we have recently developed a hierarchical theoretical approa
 ch to the static and dynamics properties of surface-supported magnetic n
 anostructures. The materials-specific information is supplied by density
  functional theory (DFT)\, which gives access to ground-state magnetic p
 roperties and magnetic interactions. The dynamics of the magnetic moment
 s follows from time-dependent DFT (TDDFT)\, accounting for the impact of
  the surface electrons on the spin dynamics. The final level of theory a
 ddresses many-body effects\, either through many-body perturbation theor
 y (MBPT) or by solving a multi-orbital Anderson impurity model with quan
 tum Monte Carlo\, yielding realistic inelastic transport spectra. In thi
 s talk I will present an overview of these theoretical methods while foc
 using on concrete physical systems: magnetic adatoms and small clusters 
 on metallic surfaces\, such as Cu(111) or Pt(111)\, in close connection 
 with the available experimental information. Different magnetic adatoms 
 on the same surface have very different static and dynamic properties [1
 -3]\, which influence their magnetic stability via zero-point spin fluct
 uations [4-6]\, while their tunneling spectra are only adequately descri
 bed in MBPT [7-9]. The interactions between magnetic adatoms depend not 
 only on their separation but also on their arrangement with respect to t
 he surface\, leading to widely different properties of apparently simila
 r clusters [10-12]. I conclude by discussing the possible shortcomings a
 nd future research directions. References: [1] Phys Rev Lett 111\, 15720
 4 (2013)\; [2] Phys Rev B 91\, 075405 (2015)\; [3] Nat Commun 7\, 10454 
 (2016)\; [4] Nano Lett 16\, 4305 (2016)\; [5] Phys Rev Lett 119\, 017203
  (2017)\; [6] Phys Rev B 96\, 144410 (2017)\; [7] Phys Rev B 89\, 235439
  (2014)\; [8] Phys Rev B 93\, 115123 (2016)\; [9] Phys Rev B 93\, 035451
  (2016)\; [10] Nat Commun 7\, 10620 (2016)\; [11] Phys Rev B 96\, 144401
  (2017)\; [12] Nat Commun 8\, 642 (2017)
LOCATION:PS1.28
CATEGORIES:Theory Seminar
LAST-MODIFIED:20181004T134525Z
ORGANIZER;CN=Gareth Alexander:
END:VEVENT
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