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Comportamiento crítico de un gas Bose atrapado que interactúa

T Donner¹, S Ritter, T Bourdel

¹Institute of Quantum Electronics, Eidgenössische Technische Hochschule (ETH) Zürich, CH-8093 Zürich, Switzerland.

Science (New York, N.Y.)

|March 17, 2007

Resumen

Los investigadores estudiaron las fluctuaciones críticas de la condensación de Bose-Einstein utilizando interferencia de onda de materia. Midieron la longitud de correlación, encontrando un exponente crítico de 0.67 +/- 0.13, avanzando en la comprensión de las transiciones de fase de segundo orden.

Área de la Ciencia:

La física cuántica es la física cuántica.
Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada

Sus antecedentes:

La condensación de Bose-Einstein (BEC) es un estado cuántico de la materia.
Los fenómenos críticos en BEC implican fluctuaciones más allá de las longitudes de onda térmicas de Broglie.

Objetivo del estudio:

Para investigar el régimen crítico de la condensación Bose-Einstein.
Para medir la longitud de correlación de las fluctuaciones críticas en un gas Bose atrapado y de interacción débil.

Principales métodos:

Utilizó técnicas de interferencia de onda de materia.
Estudió la longitud de correlación en función de la temperatura cerca del punto crítico.

Principales resultados:

Comportamiento divergente observado de la longitud de correlación por encima de la temperatura crítica.
Determinado el exponente crítico para que la longitud de correlación sea nu = 0.67 +/- 0.13.

Conclusiones:

El exponente crítico medido proporciona información sobre las transiciones de fase de segundo orden.
Este estudio mejora la comprensión de las transiciones de fase cuántica en gases atómicos ultrafríos.

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