نوع مقاله : پژوهشی
نویسندگان
1 استادیار، گروه فیزیک، دانشگاه پیام نور، تهران، ایران.
2 دانشیار، گروه فیزیک، دانشگاه پیام نور، تهران، ایران.
چکیده
در این مقاله با دوپینگ جایگزینی فلزات دوره‌های 3d، 4d و 5d روی تک لایه PdS2 خواص الکترونی مطالعه شده است. نتایج به‌دست آمده نشان می‌دهد که در دوپینگ جایگزینی فلزات 3d(Sc, Fe)، 4d(Y, Ru, Rh) و 5d(Os) به جای یک اتم سطح فرمی یا به داخل شیفت پیدا کرده یا اینکه زیر و نزدیک آن واقع شده است. بنابراین؛ ساختار رفتار نیم‌هادی پذیرنده دارد. اما برای دوپینگ فلزات 3d(Ti, Cr, Co)، 4d(Zr, Mo) و 5d(Hf, W, Ir, Au) سطح فرمی به داخل نفوذ کرده یا اینکه بالای و نزدیک آن واقع شده است. در این حالت ساختار دوپینگ شده نقش نیم‌هادی دهنده بازی می‌کند. اما ساختار الکترونی PdS2 در اثر دوپینگ فلزات 3d(Ni, Zn)، 4d(Pd, Cd) و 5d(Pt, Hg) تغییر کرده و همچنان نیم‌هادی داتی باقی می‌ماند به‌گونه‌ای که بیشترین گاف انرژی مربوط به همین فلزات است. دوپینگ فلزات 3d(V, Mn, Cu)، 4d(Nb, Tc, Ag) و 5d(Ta, Re) ساختار الکترونی سیستم را به کلی تغییر داده و سیستم تبدیل به رسانا می‌شود. این تغییرات متنوع اسپینی در ترکیبات فوق می‌تواند اساس ایده‌های علمی برای ساخت وسایل اسپینرونیک تلقی شود.
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