Sökning: "Bose- Einstein condensation"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden Bose- Einstein condensation.

1. 1. Bose-Einstein Condensation of Magnetic Excitons in Semiconductor Quantum Wells

   Författare :Vitalie Boţan; Lars Nordström; Sveatoslav Moskalenko; Pavlos Lagoudakis; Uppsala universitet; []
   Nyckelord :Physics; Bose-Einstein condensation; magnetic excitons; electron-hole pairs; electron-hole liquid; magnetorotons; magnetoplasmons; superfluidity; Fysik;

   Sammanfattning : In this thesis regimes of quantum degeneracy of electrons and holes in semiconductor quantum wells in a strong magnetic field are studied theoretically. The coherent pairing of electrons and holes results in the formation of Bose-Einstein condensate of magnetic excitons in a single-particle state with wave vector K. LÄS MER

3. 2. Spectral Inequalities and Their Applications in Quantum Mechanics

   Författare :Fabian Portmann; Ari Laptev; Robert Seiringer; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spectral inequalities; quantum mechanics; Hardy inequalities; Sobolev inequalities; Lieb-Thirring inequalities; stability of matter; Bose gases; Bose-Einstein condensation; Mathematics; Matematik; Fysik; Physics;

   Sammanfattning : The work presented in this thesis revolves around spectral inequalities and their applications in quantum mechanics.In Paper A, the ground state energy of an atom confined to two dimensions is analyzed in the limit when the charge of the nucleus Z becomes very large. LÄS MER

4. 3. Vortices and Persistent Currents in Rotating Bose Gases - a Diagonalization Approach

   Författare :Sara Bargi; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bose-Einstein condensation; vortices; superfluidity; Fysicumarkivet A:2010:Bargi;

   Sammanfattning : In this thesis, I explore the behavior of rotating ultra-cold Bose gases, by diagonalizing the Hamiltonian. This method has the advantage of being exact in the limit of weak interactions, and thus is a useful complement to the more commonly used Gross-Pitaevskii (GP) equation, which relies on a mean-field approximation. LÄS MER

5. 4. Superfluidity and Supersolidity in Ultracold Atomic Gases Beyond Mean Field

   Författare :Mikael Nilsson Tengstrand; NanoLund: Centre for Nanoscience; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bose-Einstein condensation; superfluidity; supersolidity; ultracold atomic gases; dipolar gases; binary Bose mixtures; quantum droplets; beyond mean field; quantum fluctuations; Fysicumarkivet A:2022:Nilsson;

   Sammanfattning : This thesis investigates ultracold bosonic systems using an extended mean-field formalism with a focus on their superfluid and supersolid properties. The dissertation comprises five chapters and four articles, where the chapters provide some background to the research put forward in articles. LÄS MER

7. 5. Experimental and Numerical Investigations of Ultra-Cold Atoms

   Författare :Magnus Rehn; Anders Kastberg; Claude Dion; Matti Kaivola; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ultracold atoms; optical lattices; Bose-Einstein condensation; quantum phase transitions; Physics; Fysik;

   Sammanfattning : I have been one of the main responsible for building a new laboratory for Bose-Einstein condensation with 87Rb. In particular, the experimental setup has been designed for performing experiments with Bose-Einstein condensates load into optical lattices of variable geometries. All parts essential for Bose-Einstein condensation are in place. LÄS MER