Sökning: "Bose-Einstein"

Visar resultat 21 - 25 av 31 avhandlingar innehållade ordet Bose-Einstein.

1. 21. Ultracold atoms in optical potentials : from noise-induced transport to superfluidity

   Författare :Martin Zelan; Claude Dion; Sile Nic Chormaic; Umeå universitet; []
   Nyckelord :Brownian motors; noise-induced transport; superfluidity; ultracold atoms; optical potentials; optical lattices; laser coooling; fysik; Physics;

   Sammanfattning : In this thesis, both experimental studies and numerical simulations of ultracold atoms in optical potentials are presented in a collection of nine scientific papers. In particular, noise-induced transport in dissipative optical lattices and superfluid properties of Bose-Einstein condensates have been studied. LÄS MER

3. 22. Excitations in Superfluids : From solitons to gravitational waves

   Författare :Alberto Cetoli; Emil Lundh; Luis Santos; Umeå universitet; []
   Nyckelord :;

   Sammanfattning : In 1995 two different research groups observed for the first time the Bose-Einstein condensation (BEC) in ultracold gases. When the confining magnetic trap was turned off the gas was left free to expand, and the velocity of the particles showed a clear peak: most of the particles were occupying the same single particle state, the one of lowest energy. LÄS MER

4. 23. Multi-species systems in optical lattices : From orbital physics in excited bands to effects of disorder

   Författare :Fernanda Pinheiro; Jonas Larsson; Jani-Petri Martikainen; Ehud Altman; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical Physics; teoretisk fysik;

   Sammanfattning : In this thesis we explore different aspects of the physics of multi-species atomic systems in optical lattices. In the first part we will study cold gases in the first and second excited bands of optical lattices - the p and d bands. LÄS MER

5. 24. Abelian and non-abelian quantum Hall hierarchies

   Författare :Yoran Tournois; Maria Hermanns; Kareljan Schoutens; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fractional quantum hall effect; conformal field theory; Ginzburg-Landau-Chern-Simons; Chern-Simons; wave functions; anyons; fractional statistics; braiding; composite bosons; teoretisk fysik; Theoretical Physics;

   Sammanfattning : A core tenet of condensed matter physics has been that different phases of matter can be classified according to Landau's symmetry breaking paradigm. It has become clear, however, that phases of matter exist that are not distinguished by symmetry, but rather by topology. LÄS MER

7. 25. Many-photon effects in time-resolved second harmonic generation from systems in optical cavities

   Författare :Megha Gopalakrishna; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Second harmonic generation; Cavity optics; Non-linear optics; Cavity leakage; Ultracold atoms; Dicke model; Exact diagonalization; Non-equilibrium Green s functions; Fysicumarkivet A:2024:Gopalakrishna;

   Sammanfattning : Second harmonic generation is popular due to its numerous applications in different technologies dealing with multiple fields of science. The rapid technical advancement with the second harmonic generation demands parallel development in the theoretical understanding. LÄS MER