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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster IV

Q 56.7: Poster

Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster

Fermion- and Spin-Counting in Strongly Correlated Systems with Noise — •Sibylle Braungardt¹, Aditi SenDe¹, Ujjwal Sen¹, and Maciej Lewenstein^1,2 — ¹ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain — ²ICREA Institucio Catala de Ricerca i Estudis Avancats, 08010 Barcelona, Spain

The properties of certain strongly correlated Fermi systems and spin models can be studied by applying atom counting theory. In particular, the criticality of systems, that exhibit a quantum phase transition (QPT), is reflected in the moments of the counting distribution. For a class of one dimensional Fermi- and spin systems, we study the effects of temperature and noise due to a coupling to the environment. We establish limits to the noise under which the criticality can still be observed in the moments of the distribution.