[seminar] Seminar Holger B. Nielsen, 21. rujna 2010. (utorak) u 15:00 c.t., IRB, seminar Zavoda za teorijsku fiziku

[Hrvoje Stefancic]

      INSTITUT Ruđer Bošković
      ZAVOD ZA TEORIJSKU FIZIKU
      Bijenička c. 54, Zagreb, Hrvatska
 
 
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                     SEMINAR ZAVODA ZA TEORIJSKU  FIZIKU
            (Zajednički seminari Zavoda za teorijsku fiziku i 
		Zavoda za eksperimentalnu fiziku IRB-a i 
		Zavoda za teorijsku fiziku PMF-a)
 
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 	Holger B. Nielsen, The Niels Bohr Institute, Copenhagen, Denmark
     

    "Homolumo gap in dynamical matrix Hamiltonian for interacting
fermions"

      Vrijeme:  21. rujna 2010. (utorak) 15.00, c.t.
 
      Mjesto:  Institut Ruđer Bošković, seminar Zavoda za teorijsku
fiziku
 
      Sažetak: In many systems like molecules one considers Fermions in
some
complicated potential provided by say the nucleons depending on
Bosonic degrees of freedom. In such systems there is a very general
effect of the Fermions acting back on the Boson degrees of freedom
causing the distance between highest occupied Fermion level (homo)
and the lowest unoccupied (lumo) to be especially large. This is the
homolumo gap. We study the homolumo gap using for the Bosonic degrees
of 
freedom a many level dynamical matrix model, which is known to
correspond
to the Callogero model, interacting with the Fermions. This interaction
is so 
that the dynamical matrix is simply the single Fermion Hamiltonian.
We close with observation that although the described system is an
interacting
system, we can almost solve it.

             
  
     Voditelj seminara:
     Hrvoje Štefančić (shrvoje at thphys.irb.hr)