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Observación de las interacciones mediadas por fermiones entre átomos bosónicos

B J DeSalvo¹, Krutik Patel², Geyue Cai²

¹James Franck Institute, Enrico Fermi Institute, and Department of Physics, The University of Chicago, Chicago, IL, USA. bjdesalvo@uchicago.edu.

|April 5, 2019

Resumen

Los investigadores demostraron cómo las interacciones mediadas por fermiones en los condensados de Bose-Einstein pueden crear nuevas fases cuánticas. Esta interacción entre especies conduce a fuerzas atractivas entre bosones, formando solitones Bose-Fermi.

Área de la Ciencia:

Física de la materia condensada
La mecánica cuántica
Física atómica

Sus antecedentes:

El intercambio de partículas es fundamental para comprender las interacciones y las correlaciones en la física.
Los ejemplos incluyen el potencial de Yukawa del intercambio masivo de bosones y el emparejamiento de Cooper a través del intercambio de fonones.

Objetivo del estudio:

Para investigar las interacciones entre especies entre un condensado de Bose-Einstein (BEC) de cesio y un gas de Fermi de litio.
Explorar el surgimiento de potenciales efectivos, amortiguación e interacciones entre bosones mediadas.

Principales métodos:

Incorporar un condensado de Bose-Einstein de átomos de cesio dentro de un gas de Fermi degenerado de átomos de litio.
Análisis de procesos coherentes de dispersión de tres cuerpos responsables de las interacciones mediadas.

Principales resultados:

Se han demostrado interacciones atractivas entre bosones mediadas por fermiones, análogas al mecanismo de Ruderman-Kittel-Kasuya-Yosida.
Se demostró que estas interacciones pueden transformar un BEC estable en solitones de Bose-Fermi bajo condiciones específicas.
Se han observado potenciales efectivos de captura y efectos de amortiguación debido a las interacciones entre especies.

Conclusiones:

Las interacciones mediadas son una nueva vía para controlar los sistemas cuánticos.
La naturaleza de largo alcance de estas interacciones permite la correlación de átomos distantes.
Abre posibilidades para crear nuevas fases cuánticas, incluidas las fases magnéticas y los supersólidos.

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