insu-03713094
https://insu.hal.science/insu-03713094
doi:10.1088/1361-6455/abbf43
[OBSPM] Observatoire de Paris
[INSU] INSU - Institut National des Sciences de l'Univers
[CNRS] CNRS - Centre national de la recherche scientifique
[SYRTE] Systèmes de Référence Temps Espace
[PSL] Université Paris sciences et lettres
[SORBONNE-UNIVERSITE] Sorbonne Université
[SORBONNE-UNIV] Sorbonne Université 01/01/2018
[SU-SCIENCES] Faculté des Sciences de Sorbonne Université
[OBSPM-PSL] Observatoire de Paris - PSL
[ALLIANCE-SU] Alliance Sorbonne Université
Effects of finite momentum width on the reversal dynamics in a BEC based atom optics δ-kicked rotor
Mangaonkar, Jay
Vishwakarma, Chetan
Maurya, S. Sagar
Sarkar, Sumit
Maclennan, Jamie L.
Dutta, Pranab
Rapol, Umakant D.
[SDU] Sciences of the Universe [physics]
ART
Bose Einstein condensation
ultracold atoms
atom-optics kicked rotor
matter-wave interference
This experimental work demonstrates the importance of finite-width effects in the evolution of a quantum system, where the results deviate considerably from the plane wave approximation even for an initial state with a very narrow momentum width i.e a Bose-Einstein condensate. The system under consideration is an atom optics δ-kicked rotor for which a fidelity based measurement has been proposed to possess a rapid scaling of sensitivity (N<SUP>-3</SUP>) with pulse number N. Although attractive, we demonstrate that this scaling does not hold in the regime where the momentum selectivity of the pulse sequence becomes significantly smaller than the momentum width of the initial state. Additionally, the momentum distribution post kicking shows a lattice-phase dependent intra-order and inter-order asymmetry in the diffracted orders. The intra-order asymmetry, in which no net momentum current is present, is a previously unreported type of effect. For a two pulse case, the inter-order asymmetry signal is found to be about five times more sensitive to the resonance than the initial state fidelity. Both of these asymmetries provide a zero-crossing signal which can be used to diagnose any undesirable lattice phase offset at resonant and off-resonant pulse periods.
2020
en
Journal of Physics B: Atomic, Molecular and Optical Physics
IOP Publishing