خواص ترابردی وابسته به اسپین در ابرشبکه‌ی سیلیسینی تحت کرنش

ستاری, فرهاد

doi:10.22055/jrmbs.2020.15328

خواص ترابردی وابسته به اسپین در ابرشبکه‌ی سیلیسینی تحت کرنش

نوع مقاله : مقاله پژوهشی کامل

نویسنده

فرهاد ستاری

گروه فیزیک، دانشکده علوم، دانشگاه محقق اردبیلی، اردبیل، ایران

10.22055/jrmbs.2020.15328

چکیده

با استفاده از روش ماتریس انتقال بصورت نظری به مطالعه‌ی خواص ترابردی اسپینی در ابرشبکه‌ی سیلیسینی در حضور برهمکنش اسپین-مدار راشبا‌ی خارجی و کرنش می‌پردازیم. به دلیل حضور برهمکنش اسپین-مدار راشبای خارجی، رسانش اسپینی و چرخش اسپینی را می‌توان با قدرت کرنش و برهمکنش اسپین-مدار راشبای خارجی تنظیم کرد. برای مقادیر خاصی از قدرت اسپین-مدار راشبای خارجی الکترون‌ها فقط در صورتی که چرخش کامل اسپینی انجام دهند مجاز به عبور از ابرشبکه‌ی سیلیسینی هستند. همچنین رسانش اسپینی را می‌توان بطور موثر با تعداد سدهای ابرشبکه کنترل کرد، هر چه تعداد سدهای ابرشبکه افزایش پیدا می‌کند، رسانش اسپینی کاهش می‌یابد. نتایج نشان می‌دهد که با اعمال کرنش در راستای دسته صندلی بر خلاف کرنش در راستای زیگزاگ قطبش اسپینی مشاهده می‌شود و با افزایش قدرت برهمکنش اسپین-مدار راشبای خارجی افزایش می‌یابد. همچنین اندازه‌ی قطبش اسپینی را می‌توان با قدرت کرنش تنظیم کرد. بیشترین مقدار قطبش اسپینی در یک ابرشبکه‌ی سیلیسینی با هر تعداد سد پتانسیل در کرنش 2% رخ می‌دهد.

کلیدواژه‌ها

موضوعات

ماده چگال

عنوان مقاله [English]

Spin-dependent transport properties in strained silicene superlattice

نویسنده [English]

Farhad Sattari

Department of Physics, Faculty of Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

چکیده [English]

Based on the transfer-matrix method, we theoretically investigate the spin-dependent transport properties in silicene superlattice, with extrinsic Rashba spin–orbit interaction (RSOI), in the presence of strain. Due to the RSOI coupling, spin-inversion can be achieved. The spin resolved conductance and spin- inversion effect can be efficiently tuned by RSOI and strain strength. In addition, for particular values of RSOI strength, electrons with perfect spin-inversion transmit through the silicene superlattice. It is found that the spin conductance can be efficiently controlled by the number of barriers. As the number of barriers increases, spin conductivities decrease. The results indicate that for the armchair direction strain, unlike the zigzag direction the spin polarization can be observed and it increases with increasing the RSOI strength. The magnitude and sign of spin polarization can be manipulated by strain strength. The spin polarization in silicene superlattice for any number of barriers reaches a maximum value at 2% strain.

کلیدواژه‌ها [English]

Silicene superlattice
Extrinsic Rashba spin–orbit interaction
Strain
Spin-inversion
Spin polarization

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