Article
Collective excitations of trapped onedimensional dipolar quantum gases
Physical Review A (Impact Factor: 3.04). 09/2007; DOI: 10.1103/PhysRevA.77.015601
Source: arXiv

Article: On the thermalization of a Luttinger liquid after a sequence of sudden interaction quenches
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ABSTRACT: We present a comprehensive analysis of the relaxation dynamics of a Luttinger liquid subject to a sequence of sudden interaction quenches. We express the critical exponent $\beta$ governing the decay of the steadystate propagator as an explicit functional of the switching protocol. At long distances $\beta$ depends only on the initial state while at short distances it is also history dependent. Continuous protocols of arbitrary complexity can be realized with infinitely long sequences. For quenches of finite duration we prove that there exist no protocol to bring the initial noninteracting system in the ground state of the Luttinger liquid. Nevertheless memory effects are washed out at shortdistances. The adiabatic theorem is then investigated with rampswitchings of increasing duration, and several analytic results for both the propagator and the excitation energy are derived.EPL (Europhysics Letters) 02/2011; 95(1). · 2.26 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We have measured the effect of dipoledipole interactions on the frequency of a collective mode of a BoseEinstein condensate. At relatively large numbers of atoms, the experimental measurements are in good agreement with zero temperature theoretical predictions based on the ThomasFermi approach. Experimental results obtained for the dipolar shift of a collective mode show a larger dependency to both the trap geometry and the atom number than the ones obtained when measuring the modification of the condensate aspect ratio due to dipolar forces. These findings are in good agreement with simulations based on a Gaussian ansatz.Physical Review Letters 07/2010; 105(4):040404. · 7.94 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Strong correlations—cooperative behavior due to manyparticle interactions—are omnipresent in nature. They occur in electrolytic solutions, dense plasmas, ultracold ions and atomic gases in traps, complex (dusty) plasmas, electrons and excitons in quantum dots and the quark–gluon plasma. Correlation effects include the emergence of longrange order, of liquidlike or crystalline structures and collective dynamic properties (collective modes). The observation and experimental analysis of strong correlations are often difficult, requiring, in many cases, extreme conditions such as very low temperatures or high densities. An exception is complex plasmas where strong coupling can be easily achieved, even at room temperature. These systems feature the strongest correlations reported so far and experiments allow for an unprecedented precision and full singleparticle resolution of the stationary and timedependent manyparticle behavior. The governing role of the interactions in strongly correlated systems gives rise to many universal properties observed in all of them. This makes the analysis of one particular system interesting for many others. This motivates the goal of this paper which is to give an overview on recent experimental and theoretical results in complex plasmas including liquidlike behavior, crystal formation, structural and dynamic properties. It is expected that many of these effects will be of interest also to researchers in other fields where strong correlations play a prominent role.Reports on Progress in Physics 01/2010; 73(6):066501. · 13.23 Impact Factor
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