27 مهر 1398
رعد چگل

رعد چگل

مرتبه علمی: دانشیار
نشانی: دانشگاه ملایر
تحصیلات: دکترای تخصصی / نانو اپتیک
تلفن: 09166615727
دانشکده: علوم پایه

مشخصات پژوهش

عنوان
Optical absorption of zigzag single walled boron nitride nanotubes
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Optical absorption- Boron nitride nanotubes
سال
2010
مجله PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
پژوهشگران رعد چگل

چکیده

In a realistic three-dimensional model, optical matrix element and linear optical absorption of zigzag single walled boron nitride nanotubes (BNNTs) in the tight binding approximation are studied. In terms of absolute value of dipole matrix elements of the first three direct transitions at kz=0, we divided the zigzag BNNTs into three groups and investigated their optical absorption spectrum in energy ranges and . We found that in lower energies, , all groups show different behaviors while in the higher energies, and , their behaviors depend on their even or odd nanotube index. We also found that in the energy range all tubes have two distinct peaks denoted by ‘A’ and ‘B’ where the ‘B’ peak energy position is approximately constant and is independent of the nanotube diameter. We also found that increasing the tubes diameter leads to red shift for all peaks except ‘A’ peak where this peak moves to higher energies. Our results are in good agreement with the experimental results.