Name: cooling an optically trapped ultracold fermi gas by periodical driving
Uploaded: 2017-03-30T14:00:00
Description: Watch this Scientific Journal Video about Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving at JoVE.com

We thank Ji Liu and Wen Xu for involving in the experimental setup. Le Luo is a member of the Indiana University Center for Spacetime Symmetries (IUCSS). This work was supported by IUPUI and IUCRG.

NOTA: Este protocolo requiere un aparato átomo ultrafríos construido en casa incluyendo el siguiente equipo: dos láseres de diodo cavidad externa (PCIE), una configuración de bloqueo para el ECDL desplazamiento de frecuencia de bloqueo 10, un láser de fibra para el ODT, un AOM para la modulación de la intensidad del láser , un sistema de radiofrecuencia (rf) de antena con un generador de fuente y un amplificador de potencia, un sistema de imágenes de absorción con una cámara CCD, un pro...

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Presentamos un protocolo experimental para la refrigeración paramétrico de un gas de Fermi no interactúe y en una trampa óptica de haz cruzado. Los pasos críticos de este protocolo incluyen: En primer lugar, necesita ser refrigerado cerca de la temperatura degenerado mediante la reducción de la profundidad de atrapar el gas Fermi atrapados ópticamente. En segundo lugar, una frecuencia de modulación se elige que es resonante con el componente anarmónico del potencial de captura. En tercer lugar, la intensidad de...

En las dos últimas décadas, varias técnicas de enfriamiento se han desarrollado para la generación de condensados de Bose-Einstein (BEC) y degenerar gases de Fermi (DFG) de los vapores atómicos calientes 1, 2, 3, 4, 5. BEC y DFG son nuevos fases de la materia que existen en temperaturas extremadamente bajas, por lo general una millonésima de un grado por encima del cero absoluto de temperatura, muy inferiores a los que normalmente se encuentran en la tierra o en el espacio. Para obtener tales bajas temperaturas, la mayoría de los métodos de refrigeración se basan en la reducción del potencial de captura para enfriar por evaporación los átomos. Sin embargo, el esquema de reducción también disminuye la tasa de colisiones de los átomos, lo que limita la eficacia de la refrigeración cuando el gas alcanza el régimen cuántico 6. En este artículo, se presenta un método de &quot;expulsar&quot; para enfriar por evaporación un gas ultrafrío Fermi en un ODT sinla reducción de la profundidad de trampa. Este método se basa en nuestro reciente estudio de refrigeración paramétrico 7, que muestra varias ventajas en comparación con los regímenes de descenso 7, 8, 9. La idea clave del esquema paramétrico es emplear el anarmonicidad de la ODT-haz cruzado, que hace que los átomos más calientes cerca del borde del potencial de captura sienten las frecuencias de captura más bajos que los átomos más frías en el centro. Este anarmonicidad permite que los átomos más caliente al ser expulsados ​​selectivamente de la trampa cuando la modulación del potencial de captura en las frecuencias de resonancia con los átomos de alta energía. El protocolo experimental de enfriamiento paramétrico requiere un gas pre-enfriado noninteracting Fermi cerca de la temperatura degenerada. Para implementar este protocolo, un modulador acústico-óptico (AOM) se utiliza para modular la intensidad de los haces de captura por controlling la modulación de frecuencia, profundidad y tiempo. Para verificar el efecto de enfriamiento, la nube atómica se sonda de formación de imágenes por absorción de tiempo de vuelo (TOF), donde un haz de láser resonante ilumina la nube atómica y la sombra de absorción es capturada por un dispositivo acoplado de carga (CCD) de la cámara. Las propiedades de las nubes, como el número de átomos, la energía y la temperatura, se determinan por la densidad de la columna. Para caracterizar el efecto de enfriamiento, se mide la dependencia de las energías de la nube en los distintos momentos de modulación.

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cooling an optically trapped ultracold fermi gas by periodical driving

We present a cooling method for a cold Fermi gas by parametrically driving atomic motions in a crossed-beam optical dipole trap (ODT). Our method employs the anharmonicity of the ODT, in which the hotter atoms at the edge of the trap feel the anharmonic components of the trapping potential, while the colder atoms in the center of the trap feel the harmonic one. By modulating the trap depth with frequencies that are resonant with the anharmonic components, we selectively excite the hotter atoms out of the trap while keeping the colder atoms in the trap, generating parametric cooling. This experimental protocol starts with a magneto-optical trap (MOT) that is loaded by a Zeeman slower. The precooled atoms in the MOT are then transferred to an ODT, and a bias magnetic field is applied to create an interacting Fermi gas. We then lower the trapping potential to prepare a cold Fermi gas near the degenerate temperature. After that, we sweep the magnetic field to the noninteracting regime of the Fermi gas, in which the parametric cooling can be manifested by modulating the intensity of the optical trapping beams. We find that the parametric cooling effect strongly depends on the modulation frequencies and amplitudes. With the optimized frequency and amplitude, we measure the dependence of the cloud energy on the modulation time. We observe that the cloud energy is changed in an anisotropic way, where the energy of the axial direction is significantly reduced by parametric driving. The cooling effect is limited to the axial direction because the dominant anharmonicity of the crossed-beam ODT is along the axial direction. Finally, we propose to extend this protocol for the trapping potentials of large anharmonicity in all directions, which provides a promising scheme for cooling quantum gases using external driving.

Usando este protocolo, estudiamos la dependencia de la refrigeración paramétrico en el tiempo de modulación con la frecuencia de modulación optimizada y amplitud, ambos de los cuales han sido determinados en nuestra publicación anterior 7. En primer lugar, preparamos un gas de Fermi noninteracting de 6 átomos de Li en los dos estados hiperfinos más bajas con una temperatura de T / T F ≈ 1,2. Aquí, T F</sub...

Watch this Scientific Journal Video about Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving at JoVE.com

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

We present a parametric driving method to cool an ultracold Fermi gas in a crossed-beam optical dipole trap. This method selectively removes high-energy atoms from the trap by periodically modulating the trap depth with frequencies that are resonant with the anharmonic components of the trapping potential.

Enfriar un ópticamente Atrapado ultrafrías Fermi de gas por conducción periódica

We present a cooling method for a cold Fermi gas by parametrically driving atomic motions in a crossed-beam optical dipole trap (ODT). Our method employs ...

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