Non-equilibrium Dynamics of Tunnel-Coupled Superfluids: Relaxation to a Phase-Locked Equilibrium State in a One-Dimensional Bosonic Josephson Junction (Springer Theses) okumak kayıt olmadan

Non-equilibrium Dynamics of Tunnel-Coupled Superfluids: Relaxation to a Phase-Locked Equilibrium State in a One-Dimensional Bosonic Josephson Junction (Springer Theses)

Ders Kitapları

The 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. 

---

pdf kindle epub doc

---

---

Kolektif ERWIN N GRISWOLD 18,9 x 0,5 x 24,6 cm Additional Contributors 18,9 x 0,2 x 24,6 cm Mdpi AG 15 x 0,5 x 22 cm 18,9 x 0,4 x 24,6 cm 28 Ekim 2011 30 Ekim 2011 WADE H MCCREE 18,9 x 0,6 x 24,6 cm 18,9 x 0,3 x 24,6 cm 3 Ocak 2017 28 Şubat 2018 ROBERT H BORK 29 Ekim 2011 1 Ocak 2017

---

okumak okumak kayıt olmadan