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Histeresis en un circuito "atomtrónico" superfluido cuantificado
Stephen Eckel1, Jeffrey G Lee1, Fred Jendrzejewski1
1Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA.
Nature
|February 14, 2014
Resumen
Los investigadores observaron por primera vez la histeresis en condensados de Bose-Einstein superfluidos, un fenómeno crucial para los dispositivos atómtronicos. Este hallazgo cierra una brecha entre la teoría y el experimento, allanando el camino para las nuevas tecnologías cuánticas.
Área de la Ciencia:
- Atomtronics Atomtronics es una empresa de tecnología de la energía.
- 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:
- Atomtronics es un campo emergente que utiliza átomos ultrafríos en circuitos análogos a los dispositivos electrónicos.
- La histeresis es fundamental en la electrónica y la superconductividad, pero no se había observado en los condensados Bose-Einstein superfluidos.
- Las observaciones anteriores de histeresis en superfluidos carecían de flujo cuantizado o eran indirectas.
Objetivo del estudio:
- Para detectar y caracterizar directamente la histeresis en los condensados superfluidos Bose-Einstein.
- Para investigar el papel de las excitaciones y la disipación en la histeresis superfluida.
- Para explorar el potencial de la histeresis controlada en dispositivos atómtronicos.
Principales métodos:
- Fabricación de un circuito atómtronico con un anillo de condensado Bose-Einstein superfluido.
- Introducción de un eslabón débil giratorio para obstruir el flujo del superfluido.
- Detección directa de histeresis entre estados de circulación cuantizados.
Principales resultados:
- Observación directa de la histeresis entre estados de circulación cuantizados en un condensado de Bose-Einstein superfluido.
- Demostración del tamaño del bucle de histeresis sintonizable.
- Identificación de los vórtices como excitaciones clave y confirmación del papel de la disipación.
Conclusiones:
- La histeresis ahora se ha confirmado experimentalmente en condensados Bose-Einstein superfluidos.
- La histeresis controlada en circuitos atómtronicos podría permitir nuevos dispositivos cuánticos.
- Este trabajo cierra una brecha crítica en la comprensión de la dinámica de los superfluidos y la atomtrónica.
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