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Transición de fase no estequiométrica a gran escala en películas de calcogenuro de metales de transición

Zhongqiang Chen¹, Jin-An Shi², Jianqi Huang^3,4

¹State Key Laboratory of Spintronics, Jiangsu Provincial Key Laboratory of Third Generation Semiconductors and High Energy Efficiency Devices, School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China.

Nature materials

|January 16, 2026

Resumen

Los investigadores observaron una nueva transición de fase en películas de telururo de paladio (PdTe₂), lo que condujo a una emisión gigante de terahercios. Este estudio ofrece un nuevo método para crear películas de metales de transición a gran escala para aplicaciones de dispositivos.

Área de la Ciencia:

Ciencia de Materiales
Física de la Materia Condensada
Nanotecnología

Sus antecedentes:

La ingeniería de fases es crucial para las propiedades de los materiales.
El control de las transiciones de fase en los calcogenuros de metales de transición es un desafío.
La observación microscópica es clave para comprender los mecanismos de transición de fase.

Objetivo del estudio:

Observar atómicamente la vía de evolución de fases en películas de PdTe₂.
Comprender el mecanismo de las transiciones de fase no estequiométricas.
Explorar las propiedades de emisión de terahercios de las heteroestructuras resultantes.

Principales métodos:

Microscopía electrónica de transmisión (STEM) in situ para observación atómica.
Simulaciones de dinámica molecular de aprendizaje automático para verificación teórica.
Fabricación de películas superconductoras de PdTe₂ a gran escala.

Principales resultados:

Se observó la evolución de la fase no estequiométrica de PdTe₂ a PdTe mediante reconstrucción atómica.
Se identificó un estado intermedio de heteroestructura PdTe₂/PdTe.
Se demostró una emisión gigante de terahercios dependiente de la helicidad debido a la ruptura de la simetría de inversión.

Conclusiones:

Se obtuvieron información sobre la reconstrucción atómica en calcogenuros de metales de transición.
Se desarrolló una estrategia general para la fabricación de películas y heteroestructuras de monocalcogenuros de metales de transición a gran escala.
Se destacaron las posibles aplicaciones de dispositivos para los materiales fabricados.

Palabras clave:

transición de fase calcogenuros de metales de transición telururo de paladio emisión de terahercios reconstrucción atómica heteroestructuras ingeniería de fases dispositivos

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