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Vận chuyển năng lượng được hỗ trợ bởi giao diện trong các chuỗi Frenkel–Kontorova liên kết
Tóm tắt
Vai trò của các liên kết giao diện trong việc vận chuyển năng lượng của hai chuỗi Frenkel–Kontorova (FK) liên kết được khám phá thông qua các mô phỏng số. Nói chung, người ta kỳ vọng rằng các liên kết giao diện sẽ dẫn đến sự ức chế dẫn nhiệt qua hệ thống liên kết do sự tán xạ phonon–phonon giao diện bổ sung. Trong bài báo này, chúng tôi phát hiện ra rằng độ dẫn nhiệt tăng lên với cường độ tương tác giao diện tăng đối với các liên kết liên chuỗi yếu, trong khi đó dẫn nhiệt bị ức chế bởi tương tác giao diện trong trường hợp các liên kết liên chuỗi mạnh. Dựa trên phương pháp mật độ năng lượng phổ phonon, chúng tôi chứng minh rằng sự tăng cường vận chuyển năng lượng xuất phát từ các chế độ phonon kích thích (ngoài các chế độ phonon nội tại), trong khi sự tán xạ phonon–phonon giao diện mạnh dẫn đến sự ức chế vận chuyển năng lượng.
Từ khóa
#Frenkel–Kontorova; dẫn nhiệt; tương tác giao diện; tán xạ phononTài liệu tham khảo
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