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Observación con resolución de tiempo de la desconexión de la carga de giro en las cadenas fermiónicas de Hubbard

Jayadev Vijayan^1,2, Pimonpan Sompet^3,2, Guillaume Salomon^3,2

¹Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany. jayadev.vijayan@mpq.mpg.de.

Science (New York, N.Y.)

|January 11, 2020

Resumen

Los investigadores observaron que el espín y la carga se separan en átomos ultrafríos, lo que demuestra la desconexión dinámica. Esta fraccionamiento en espínones y holones ofrece nuevos conocimientos sobre los sistemas cuánticos.

Área de la Ciencia:

Física de la materia condensada
Simulación Cuántica
Átomos ultrafríos

Sus antecedentes:

Las partículas elementales poseen números cuánticos como carga y espín.
En sistemas que interactúan fuertemente, los grados de libertad emergentes pueden diferir de los constituyentes.
Los sistemas unidimensionales exhiben cuasipartículas como espinos (espín) y holones (carga).

Objetivo del estudio:

Para investigar la desconexión dinámica de las excitaciones de giro y carga.
Para observar la separación espacial de las excitaciones en las cadenas de Fermi-Hubbard.
Para entender la fraccionamiento en espínones y holones a temperaturas finitas.

Principales métodos:

Utilizó átomos ultrafríos en las cadenas de Fermi-Hubbard.
Empleó microscopía cuántica de gas con resolución espacial y temporal.
Se analizaron las correlaciones de espín y carga utilizando correladores multipunto.

Principales resultados:

Desconfinamiento dinámico observado de las excitaciones de giro y carga en el espacio real.
Seguía la evolución de las excitaciones por sus firmas de correlación.
Cuantificó la separación espacial consistente con la fraccionamiento en espínones y holones.

Conclusiones:

Demostró la separación dinámica del espín y la carga en un sistema cuántico.
Proporcionó evidencia experimental para la fraccionamiento en espínones y holones.
Ofrece información sobre fenómenos emergentes en sistemas unidimensionalmente fuertemente correlacionados.

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