The main result of the project is a new method for detecting the gradient of a magnetic field using an elongated cloud of cesium atoms cooled to near the absolute zero. Since the rotation of atomic spins depends on the magnetic field, an image of the spin states can be used to measure how the magnetic field changes along the cloud. The gradient is determined from a single image, which is an advantage over standard methods where multiple images are needed. The resolution of our single-shot gradiometer is not limited by thermal motion of atoms and has an estimated absolute accuracy below 20 nT/cm, making it one of the most accurate magnetic field gradiometers.
COBISS.SI-ID: 52681987
We demonstrate the emission of correlated atom jets from a driven matter-wave soliton in a quasi-one-dimensional optical trap. All stages of the Bose jet emission are captured in a simple model based on the 1D Gross-Pitaevskii equation, giving an insight into the dynamics of density waves that precede the emission. In the limit of vanishing high-order jets beyond-mean-field number correlations of jet pairs are observed. The simple one-dimensional geometry offers a new, simpler environment to study these so-called Bose fireworks that have previously only been observed in a two-dimensional geometry.
COBISS.SI-ID: 33287463
In this first Slovenian experimental work on cold atoms and Bose-Einstein condensation, we demonstrate a production of cesium solitons and soliton trains to study their formation, fragmentation and collisions. When a noninteracting Bose-Einstein condensate is confined to a quasi-one-dimensional channel it will spread due to dispersion as dictated by the Schrödinger equation. The spreading rate can be affected by changing the interaction between atoms via the Feshbach resonance. When the interaction is set to exactly the right value, the attraction between the atoms exactly compensates for the dispersion and we get a bright matter-wave soliton. The fact that a bright soliton can propagate over long distances and long times without dispersion makes solitons prime candidates for use in precision atomic sensors, such as gravimeters and rotation sensors.
COBISS.SI-ID: 32245799
In this article we report on the first study of rubidium-loaded LSX zeolite. The 87Rb NMR spin-lattice relaxation of the rubidium cluster component shows temperature independent behavior. This confirms the metallic ground state, despite the fact that rubidium clusters are formally confined in the insulating framework. These materials are of great interest for the detection of NQR signals by optical magnetometry, as the quadrupole frequencies are in the 1 MHz range.
COBISS.SI-ID: 20035587
We review several results of NQR studies of pharmaceuticals obtained in Ljubljana laboratories including the optical detection of the 14N NQR signals using an extremely sensitive in-house developed magnetometer.
COBISS.SI-ID: 17705475