گذار فاز عایق شبه‌توپولوژیکی به عایق در ژرمانن دولایه

محمدی, سعیده; اسماعیل پور, ایوب

doi:10.22055/jrmbs.2023.18127

گذار فاز عایق شبه‌توپولوژیکی به عایق در ژرمانن دولایه

نوع مقاله : مقاله پژوهشی کامل

نویسندگان

گروه فیزیک، دانشکده علوم پایه، دانشگاه تربیت دبیری شهید رجائی، تهران، ایران

10.22055/jrmbs.2023.18127

چکیده

نانونوار ژرمانن دولایه به‌دلیل پیوندهای بین دولایه و جفت‌شدگی اسپین – مدار قوی، دارای کاربردهای فراوانی در طراحی نانو دستگاه‌ها و دانش اسپینترونیک دارند. با استفاده از مدل تنگ‌بست و رهیافت تابع گرین، ویژگی‌های ترابرد کوانتومی و گذار فازهای توپولوژیکی نانونوار ابرشبکه ژرمانن دولایه با لبه زیگزاگ با اعمال میدان الکتریکی عمودی و جفت‌شدگی اسپین- مدار راشبا بررسی می‌شود. نتایج محاسبات نشان می‌دهد که اعمال میدان الکتریکی عمودی یک گاف انرژی ایجاد می-کند و گذار فاز فلز- نیم‌فلز در سامانه اتفاق می‌افتد. همچنین، ما شاهد گذار فاز از عایق شبه‌توپولوژیکی به عایق با اعمال میدان الکتریکی عمودی در ژرمانن دولایه بودیم. علاوه بر این، نتایج نشان می‌دهد که با تغییر دادن قدرت جفت‌شدگی اسپین- مدار راشبا، جریان اسپینی قابل کنترل است. این توانایی کنترل جریان اسپینی و رسانش در نانونوار ژرمانن کاربردهای فراوانی در نانوقطعات الکترونیکی دارد و در توسعه اسپینترونیک مفید می‌باشد.

کلیدواژه‌ها

موضوعات

ماده چگال

عنوان مقاله [English]

Phase transition of Quasi-topological insulator to band insulator in bilayer Germanene

نویسندگان [English]

saeedeh Mohammadi
Ayoub esmailpour

Department of Physics, Shahid Rajaee Teacher Training University, Lavizan, Tehran 16788-15811, Iran

چکیده [English]

Bilayer germanene nanoribbons (bGNR), due to interlayer bonds and strong spin-orbit coupling, have more application in the design of nano-devices and spintronics. Quantum transport properties and topological phases transition of zigzag superlattice bGNR exposed to the vertical electric field and Rashba spin-orbit coupling (RSOC) are studied within the tight-binding based non-equilibrium Green's function approach. Results demonstrate that by applying the vertical external electric field, a gap opening and metal-semimetal phase transition occur in the system. Meanwhile, we found the topological phase transition of a quasi-topological insulator-band insulator by applying a vertical electric field in bGNR. Further, results reveal that by tuning the RSOC strength, we can control the spin current. This controllability of spin and quantum transport in GNR may contribute to potential applications in nano-devices and the development of spintronic.

کلیدواژه‌ها [English]

Topological Phases Transition
Bilayer Germanene Nanoribbon
Vertical Electric Field
Rashba Spin-orbit Coupling
Spintronic

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