LEADER 04229nam 22006015 450 001 996418250903316 005 20200828114817.0 010 $a3-030-52844-8 024 7 $a10.1007/978-3-030-52844-7 035 $a(CKB)4100000011401218 035 $a(MiAaPQ)EBC6321318 035 $a(DE-He213)978-3-030-52844-7 035 $a(PPN)269146423 035 $a(EXLCZ)994100000011401218 100 $a20200828d2020 u| 0 101 0 $aeng 135 $aurcnu|||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aNon-equilibrium Dynamics of Tunnel-Coupled Superfluids$b[electronic resource] $eRelaxation to a Phase-Locked Equilibrium State in a One-Dimensional Bosonic Josephson Junction /$fby Marine Pigneur 205 $a1st ed. 2020. 210 1$aCham :$cSpringer International Publishing :$cImprint: Springer,$d2020. 215 $a1 online resource (xx, 187 pages) 225 1 $aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 311 $a3-030-52843-X 320 $aIncludes bibliographical references. 327 $aIntroduction -- Theoretical Framework -- Experimental Setup and Measurement of the Observables -- Relaxation of the Josephson Oscillations in a 1D-BJJ -- Transition to a Relaxation-Free Regime -- Outlook: Consequence of a Relaxation on the Splitting of a 1D Bose Gas. 330 $aThe relaxation of isolated quantum many-body systems is a major unsolved problem of modern physics, which is connected to many fundamental questions. However, realizations of quantum many-body systems which are both well isolated from their environment and accessible to experimental study are scarce. In recent years, the field has experienced rapid progress, partly attributed to ultra-cold atoms. This book presents the experimental study of a relaxation phenomenon occurring in a one-dimensional bosonic Josephson junction. The system consists of two 1D quasi Bose-Einstein condensates of 87Rb, magnetically trapped on an atom chip. Using radio-frequency dressing, the author deforms a single harmonic trap, in which the atoms are initially condensed, into a double-well potential and realizes a splitting of the wave function. A large spatial separation and a tilt of the double-well enable the preparation of a broad variety of initial states by precisely adjusting the initial population and relative phase of the two wave packets, while preserving the phase coherence. By re-coupling the two wave packets, the author investigates tunneling regimes such as Josephson (plasma) oscillations and macroscopic quantum self-trapping. In both regimes, the tunneling dynamics exhibits a relaxation to a phase-locked equilibrium state contradicting theoretical predictions. The experimental results are supported with an empirical model that allows quantitative discussions according to various experimental parameters. These results illustrate how strongly the non-equilibrium dynamics differ from the equilibrium one, which is well described by thermodynamics and statistical physics. . 410 0$aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 606 $aQuantum physics 606 $aCondensed matter 606 $aLow temperature physics 606 $aLow temperatures 606 $aQuantum Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P19080 606 $aCondensed Matter Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P25005 606 $aLow Temperature Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P25130 615 0$aQuantum physics. 615 0$aCondensed matter. 615 0$aLow temperature physics. 615 0$aLow temperatures. 615 14$aQuantum Physics. 615 24$aCondensed Matter Physics. 615 24$aLow Temperature Physics. 676 $a621.35 700 $aPigneur$b Marine$4aut$4http://id.loc.gov/vocabulary/relators/aut$0843416 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a996418250903316 996 $aNon-equilibrium Dynamics of Tunnel-Coupled Superfluids$91882034 997 $aUNISA