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Doctoral theses

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Identifier 000425072
Title Guided matter-wave interferometry
Alternative Title Καθοδηγούμενη συμβολομετρία υλικών κυμάτων
Author Pandey, Saurabh
Thesis advisor Παπάζογλου, Δημήτριος
Wolf von Klitzing
Reviewer Σαββίδης, Παύλος
Κοπιδάκης, Γεώργιος
Κιοσέογλου, Γεώργιος
Μακρής, Κωνσταντίνος
Καβουλάκης, Γεώργιος
Abstract Coherent guiding and manipulation of matter-waves is of utmost importance in the development of practical atomtronic sensors and devices. In this thesis, I present excitationless guiding of Bose-Einstein condensates (BECs) at hypersonic speeds in magnetic time-averaged adiabatic potential (TAAP) rings traps and waveguides. For the first time, matter-waves are transported for a record distance of 40 cm at hypersonic speeds without detecting any extra excitation when compared to the static case. To realize a rotation sensor utilizing the clock transition of Rubidium 87 (87Rb), I present trapping and manipulation of the spin states of 87Rb, in two arms of a ring trap. The extreme smoothness of TAAP rings is demonstrated via the propagation of BECs in the ring waveguide, measured smoothness is below 200 pK. In a different interferometer configuration, using optical beam splitters and guided matter-waves in a horizontal ring waveguide, I implemented delta-kick cooling technique to achieve compact atomic wave-packet guiding for seconds. The one-dimensional effective BEC temperature is lowered by a factor of 30, down to a few nanoKelvin. These demonstrations now provide a platform to realize highly sensitive, compact atomic rotation sensors, and investigate fundamental questions, e.g., superfluidity of BECs much above their critical velocity.
Language English
Subject Bose -einstein condensation
Delta-Kick cooling
Hypersonic transport
Laser cooling
Magnetic trapping
Ring waveguide
Time -averaged adiabatic potentials
Δακτυλιοειδής κυματοδηγός
Μαγνητική παγίδευση
Συμβολομετρία ατόμων
Συμπύκνωση Bose Einstein
Υπερηχητική μεταφορά
Ψύξη λέιζερ
Ψύξη με παλμούς Δέλτα
Issue date 2019-11-29
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Materials Science and Technology--Doctoral theses
  Type of Work--Doctoral theses
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