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Transporte quiral conmutable en el metal kagome ordenado por carga CsV3Sb5
Chunyu Guo1,2, Carsten Putzke3, Sofia Konyzheva4
1Laboratory of Quantum Materials (QMAT), Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland. chunyu.guo@mpsd.mpg.de.
Nature
|October 12, 2022
Resumen
Los investigadores observaron una anisotropía magnetoquiral electrónica (eMChA) en el metal kagome centrosimétrico CsV3Sb5. Este transporte quiral, controlable por campos magnéticos, está relacionado con el orden de carga y la ruptura de simetría de reversión del tiempo.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- Los materiales cuánticos
Sus antecedentes:
- Los coeficientes de transporte quiral son respuestas inusuales prohibidas en los metales achirales.
- Estos efectos generalmente requieren materiales que carecen de un centro de inversión y un fuerte acoplamiento quiral.
- Las observaciones anteriores se limitaron a materiales con una fuerte ruptura de simetría de espejo atómico.
Objetivo del estudio:
- Para investigar el transporte quiral en el metal kagome centrosimétrico CsV3Sb5.
- Para explorar la relación entre la quiralidad electrónica, el orden de carga y la ruptura de simetría de reversión del tiempo.
- Para demostrar el control del campo magnético del transporte quiral en un material centrosimétrico.
Principales métodos:
- Mediciones de generación de segunda armonía bajo un campo magnético en el plano.
- Mediciones dependientes de la temperatura para sondear el estado ordenado de la carga.
- Análisis de la influencia de los componentes del campo magnético fuera del plano en la quiralidad.
Principales resultados:
- Se observó una anisotropía magnetoquiral electrónica significativa (eMChA) en CsV3Sb5 por debajo de 35 K, dentro de su estado ordenado de carga (T_CDW ≈ 94 K).
- Se estableció una correspondencia directa entre la quiralidad electrónica, el orden de carga unidireccional y la ruptura de simetría de inversión de tiempo espontánea.
- Se ha demostrado que la quiralidad está establecida por el componente de campo fuera del plano y puede cambiarse cambiando el signo de campo.
Conclusiones:
- CsV3Sb5 exhibe un fuerte transporte quiral a pesar de su naturaleza centrosimétrica.
- El transporte quiral observado está íntimamente relacionado con el estado ordenado de carga y la ruptura de simetría.
- Este material ofrece un control sin precedentes sobre el transporte quiral a través de campos magnéticos, allanando el camino para la electrónica quiral.
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