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Observación del efecto Hall anómalo cuantizado fraccionalmente

Heonjoon Park¹, Jiaqi Cai¹, Eric Anderson¹

¹Department of Physics, University of Washington, Seattle, WA, USA.

|August 17, 2023

Resumen

Los investigadores observaron efectos Hall anómalos cuánticos enteros y fraccionados en el MoTe2 de doble capa retorcida. Este descubrimiento permite nuevas investigaciones sobre la fraccionamiento y las estadísticas aniónicas en el campo magnético cero.

Área de la Ciencia:

Física de la materia condensada
Ciencias de los materiales

Sus antecedentes:

El efecto Hall anómalo cuántico (QAH) es un análogo de campo magnético cero del efecto Hall cuántico, que ocurre en sistemas de banda topológicamente no triviales con simetría de inversión de tiempo rota.
El descubrimiento de un efecto QAH fraccionario, impulsado por correlaciones de electrones, representaría un avance significativo en la física de la materia condensada.

Objetivo del estudio:

Informar la observación directa de los efectos QAH enteros y fraccionados.
Para investigar estos fenómenos en la doble capa retorcida MoTe2 en el campo magnético cero.

Principales métodos:

Mediciones de transporte eléctrico en el MoTe2 de doble capa retorcida.
Análisis de la resistencia de Hall (Rxy) y la resistencia longitudinal (Rxx) en varios factores de llenado (ν).
Investigación de la dependencia del campo magnético de las características observadas.

Principales resultados:

Observación de una meseta QAH entera en ν = -1, con Rxy cuantificado a h/e2 y desapareciendo Rxx.
Observación de las características de la meseta QAH fraccionada en ν = -2/3 y -3/5.
Cambio lineal de todas las características con campo magnético aplicado, consistente con los números de Chern -1, -2/3 y -3/5.
Similaridad con el comportamiento del líquido Fermi compuesto cerca del medio llenado (ν = -1/2).

Conclusiones:

Observación directa de los efectos QAH enteros y fraccionados en la bicamada retorcida de MoTe2 en el campo magnético cero.
Esto proporciona una plataforma para estudiar la fraccionamiento de carga y las estadísticas aniónicas sin campos magnéticos externos.

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