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Coherencia de espín de electrones a temperatura ambiente en candidatos de espín molecular fotogenerados

Maximilian Mayländer¹, Philipp Thielert¹, Theresia Quintes¹

¹Institute of Physical Chemistry, University of Freiburg, Albertstraße 21, 79104 Freiburg, Germany.

Journal of the American Chemical Society

|June 20, 2023

Resumen

Los investigadores exploraron compuestos de radicales cromóforos para la espíntrónica molecular. Demostraron una manipulación de espín coherente y lograron un tiempo de coherencia de espín de 0,7 μs a temperatura ambiente, allanando el camino para aplicaciones de información cuántica.

Área de la Ciencia:

Espintrónica molecular
Ciencias de la información cuántica
Química orgánica de los radicales

Sus antecedentes:

La identificación de nuevos materiales de qubits de espín es crucial para el avance de la espintrónica molecular y las aplicaciones de información cuántica.
Los sistemas de radicales cromóforos fotoexcitados, específicamente el perilenodiimida (PDI) y los radicales 2,2,6,6-tetrametilpiperidina-1-oxilo (TEMPO), son prometedores como moléculas candidatas.
Comprender la influencia de la estructura molecular, incluido el etiquetado de isótopos, en las propiedades de espín es esencial para el desarrollo de materiales.

Objetivo del estudio:

Investigar la dinámica de espín y las propiedades de coherencia de los sistemas de radicales cromóforos PDI-TEMPO.
Para explorar el efecto del etiquetado de isótopos en los tiempos de coherencia de espín de electrones.
Demostrar la viabilidad de la manipulación de espín coherente a temperatura ambiente para posibles aplicaciones cuánticas.

Principales métodos:

Se empleó la espectroscopia de resonancia paramagnética de electrones transitorios (EPR) para estudiar los compuestos de radicales cromóforos fotoexcitados.
El estudio se centró en una serie de tres compuestos PDI-TEMPO con variaciones en la fracción TEMPO.
Se utilizó el etiquetado isotópico del radical TEMPO para investigar su influencia en los espectros EPR y la coherencia de espín.

Principales resultados:

Se logró una manipulación coherente de los estados de espín molecular en los sistemas PDI-TEMPO a temperatura ambiente.
Se midió un tiempo de coherencia de espín de electrones significativo de 0,7 μs en condiciones ambientales.
Se demostró que el etiquetado isotópico de la fracción TEMPO influye en los espectros EPR observados y en la coherencia de espín.

Conclusiones:

Los sistemas de radicales cromóforos PDI-TEMPO exhiben propiedades prometedoras para las aplicaciones de espíntrónica molecular y información cuántica.
La demostración de la coherencia de espín de electrones a temperatura ambiente es un paso clave hacia los dispositivos cuánticos moleculares prácticos.
Estos hallazgos ponen de relieve el potencial de las moléculas orgánicas adaptadas para tecnologías avanzadas basadas en el espín.

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