Temat: 03.75.Kk - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Fluctuations between the BCS and BEC Limits in the System of Ultracold Alkali Atoms
Autorzy:: Domański, T.
Donabidowicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/2046728.pdf
Data publikacji:: 2006-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
03.75.Kk
03.75.Ss
Opis:: We investigate the fluctuations induced by time-dependent interchange between the Bardeen-Cooper-Schrieffer and Bose-Einstein condensation regimes in the ultracold gas of fermion atoms. Such crossover can be triggered by varying the external magnetic field across the Feshbach resonance. Experimental realization is usually done via very fast switching which leads to the nonequilibrium effects. In this paper we focus on the ground state properties. In particular, we analyze time dependence of the wave function and consider fluctuations of the order parameters.
Źródło:: Acta Physica Polonica A; 2006, 109, 4-5; 471-476
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Pseudogap and Other Precursor Signatures in the Systems with Local Fermion Pairs
Autorzy:: Domański, T.
Powiązania:: https://bibliotekanauki.pl/articles/2038382.pdf
Data publikacji:: 2004-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Mn
71.10.Li
03.75.Kk
Opis:: We consider precursor effects of the superconducting order which possibly show up in the normal state of high temperature superconducting materials. The local pairs of electrons or holes are formed there well above the transition temperature T$\text{}_{c}$. Due to strong quantum fluctuations the single particle density of states can be partly depleted near the Fermi energy leading to the pseudogap. We claim that this feature should go hand in hand with emergence of the Bogoliubov-type quasiparticles. In the normal state they are expected to be damped and acquire the long lifetime upon passing T$\text{}_{c}$. These Bogoliubov-type quasiparticles may nevertheless become correlated on a finite spatial and temporal scale. We discuss how such short-range pair correlations can be detected experimentally.
Źródło:: Acta Physica Polonica A; 2004, 106, 5; 553-560
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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