Electrical Manipulation of Spin-Dependent Anisotropy of a Dirac Cone in a Graphene Superlattice with Alternating Periodic Electrostatic and Exchange Fields

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Somroob, Pattana; Liewrian, Watchara;

ผู้เผยแพร่: MDPI

ปีที่เผยแพร่ (ค.ศ.): 2023

Volume number: 8

Issue number: 1

นอก: 24103896

eISSN: 2410-3896

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85150891960&doi=10.3390%2fcondmat8010028&partnerID=40&md5=e200f9d8ada61f7a2d641a049c6cad1b

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

We studied the spin-dependent behavior of the electronic properties of alternating periodic potentials applied to finite and infinite graphene superlattices coupled with tunable electrostatic and exchange fields. The band structures were evaluated using the transfer matrix approach. The results of tuning the coupled electrostatic potential and exchange field showed that the spin-dependent anisotropy of a Dirac cone depends on the difference between the amplitude of periodically modulated coupling. Spin-dependent collimation occurs when the modulations become zero-average potentials with the ratio of both periodically modulated strengths equals one, in which one spin can be moved freely, but the other one is highly collimated. In addition, we find that the number of extra Dirac points in the infinite superlattice is spin-dependent. In terms of spin-ups, their number increases with an increase in the strength of both modulated fields. To ensure this calculation, we also compute the conductance of finite periodic modulation at zero energy. It is shown that the peaks of the conductance occur when the extra Dirac point emerges. This result may be utilized to design graphene-based devices with highly spin-polarized collimators. © 2023 by the authors.

คำสำคัญ

band structure engineering, spintronics