[institut] Danas: SCL seminar: Masaki Oshikawa, utorak, 2. april, 15:00

[Antun Balaz]

Postovane koleginice i kolege,

Pozivam vas da u utorak, 2. aprila 2013. godine dodjete na SCL seminar koji ce u biblioteci Instituta za fiziku sa pocetkom u 15 casova odrzati Masaki Oshikawa (University of Tokyo, Institute for Solid State Physics, Japan). Naziv seminara je:

Ground-state energies of spinless free Fermions and hard-core Bosons

Abstract:

We compare the groundstate energies of bosons and fermions with the same form of the Hamiltonian. If both are noninteracting, the groundstate energy of bosons is always lower, owing to Bose-Einstein condensation. However, the comparison is nontrivial when bosons do interact. We first prove that, when the hopping is unfrustrated (all the hopping amplitudes are non-negative), hard-core bosons still must have a lower groundstate energy than the fermions. When the hopping is frustrated, bosons can have higher groundstate energy than fermions. We prove rigorously that this inversion indeed occurs in several examples, including some flat-band models.


Srdacan pozdrav,
Antun Balaz

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Antun Balaz
E-mail: antun at ipb.ac.rs
Web: http://www.scl.rs/

Phone: +381 11 3713152
Fax: +381 11 3162190

Scientific Computing Laboratory
Institute of Physics Belgrade
Pregrevica 118, 11080 Belgrade, Serbia
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