Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Ville Pietilä"'
Autor:
Kuan Tan, Ilari Maasilta, Russell E. Lake, Pauli Virtanen, Joonas Govenius, Juhani Julin, Ville Pietilä, Mikko Möttönen
Publikováno v:
Physical Review B. 90(6):1-8
We introduce a microwave bolometer aimed at high-quantum-efficiency detection of wave packet energy within the framework of circuit quantum electrodynamics, the ultimate goal being single microwave photon detection. We measure the differential therma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2532276f9a90b048a00254d9024a56fb
http://juuli.fi/Record/0340143814
http://juuli.fi/Record/0340143814
We study non-equilibrium dynamics of ultracold two-component Fermi gases in low-dimensional geometries after the interactions are quenched from weakly interacting to strongly interacting regime. We develop a T-matrix formalism that takes into account
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e1d50d26d38251c6c60b76c938c76fec
http://arxiv.org/abs/1110.0494
http://arxiv.org/abs/1110.0494
Autor:
Mikko Möttönen, Ville Pietilä
We study phase transitions in homogeneous spin-1 Bose gases in the presence of long-range magnetic dipole-dipole interactions (DDI). We concentrate on three-dimensional geometries and employ momentum shell renormalization group to study the possible
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ac0e6a9a1a0084a51160204222a8e4e
http://arxiv.org/abs/1103.5790
http://arxiv.org/abs/1103.5790
We theoretically analyze inverse radiofrequency (rf) spectroscopy experiments in two-component Fermi gases. We consider a small number of impurity atoms interacting strongly with a bath of majority atoms. In two-dimensional geometries we find that th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df61ebd420eb8b992f792daf6f617cbe
We show theoretically that a monopole defect, analogous to the Dirac magnetic monopole, may exist as the ground state of a dilute spin-1 Bose-Einstein condensate. The ground-state monopole is not attached to a single semi-infinite Dirac string, but f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9bfca5bc1c15f7b445bb27ef56633e54
Publikováno v:
Physical Review A. 81
Motivated by a recent demonstration of cyclic addition of quantized vorticity into a Bose-Einstein condensate, the vortex pump, we study dynamical instabilities and core sizes of giant vortices. The core size is found to increase roughly as a square-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b2c8131516116c2ea29feb029bd7873
https://doi.org/10.1103/physreva.81.023603
https://doi.org/10.1103/physreva.81.023603
Autor:
Mikko Möttönen, Ville Pietilä
We demonstrate theoretically that using standard external magnetic fields, one can imprint point-like topological defects to the spin texture of a dilute Bose-Einstein condensate. Symmetries of the condensate order parameter render this topological d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f75771bdd8aaf66c4a969b90f9ce22c
http://arxiv.org/abs/0903.4732
http://arxiv.org/abs/0903.4732
Publikováno v:
Physical Review A. 79
The low-lying excitations of coreless vortex states in $F=1$ spinor Bose-Einstein condensates (BECs) are theoretically investigated using the Gross-Pitaevskii and Bogoliubov--de Gennes equations. The spectra of the elementary excitations are calculat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42b14cbc51496e8c354681738c653fb5
https://doi.org/10.1103/physreva.79.023618
https://doi.org/10.1103/physreva.79.023618
Recently, the Berezinskii-Kosterlitz-Thouless transition was found to be mediated by half-quantum vortices (HQVs) in two-dimensional (2D) antiferromagnetic Bose gases [Phys. Rev. Lett. 97, 120406 (2006)]. We study the thermal activation of HQVs in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::068d5c8a182202afcf4d656a5f5bc8e2
Autor:
Ville Pietilä, Mikko Möttönen
Recently, an effective non-Abelian magnetic field with a topology of a monopole was shown to emerge from the adiabatic motion of multilevel atoms in spatially varying laser fields [J. Ruseckas et al., Phys. Rev. Lett. 95, 010404 (2005)]. We study thi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::94ead718de38e2852eb59f774dc16d6f