Valley filtering due to orbital magnetic moment in bilayer graphene

被引：17

作者：

Park, Chang-Soo ^{[1
]}

机构：

[1] Dankook Univ, Dept Phys, Cheonan 330714, South Korea

来源：

PHYSICS LETTERS A | 2018年 / 382卷 / 2-3期

关键词：

Valley filtering; Orbital magnetic moment; Bilayer graphene; BERRY-PHASE; BLOCH BANDS; SUPERLATTICES; TRANSITION; DYNAMICS;

D O I：

10.1016/j.physleta.2017.10.044

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the effect of valley-dependent orbital magnetic moment on the transmission of quasiparticles through biased bilayer graphene npn and pnp junctions in the presence of out-of-plane magnetic field. It is shown that the valley-polarized Zeeman-like energy splitting, due to the interaction of orbital magnetic moment with magnetic field, can suppress the transmission of quasiparticles of one valley while transmitting those of the other valley. This valley-selective transmission property can be exploited for valley filtering. We demonstrate that the npn and pnp junction, respectively, filters off the K'-valley and K-valley particles, with nearly perfect degree of filtration. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：121 / 126

页数：6

共 48 条

[1] Generation of valley polarized current in bilayer graphene [J].

Abergel, D. S. L. ;

Chakraborty, Tapash .

APPLIED PHYSICS LETTERS, 2009, 95 (06)

[2] Valleytronics and phase transition in silicene [J].

Aftab, Tayyaba .

PHYSICS LETTERS A, 2017, 381 (10) :935-943

[3] ELECTRON OPTICS WITH DIRAC FERMIONS: ELECTRON TRANSPORT IN MONOLAYER AND BILAYER GRAPHENE THROUGH MAGNETIC BARRIER AND THEIR SUPERLATTICES [J].

Agrawal , Neetu ;

Ghosh, Sankalpa ;

Sharma, Manish .

INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 2013, 27 (10)

[4] Reversal of Klein reflection by magnetic barriers in bilayer graphene [J].

Agrawal , Neetu ;

Grover, Sameer ;

Ghosh, Sankalpa ;

Sharma, Manish .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2012, 24 (17)

[5]

ASHCROFT NW, 1976, SOLID STATE PHYS, pCH12

[6] QUANTAL PHASE-FACTORS ACCOMPANYING ADIABATIC CHANGES [J].

BERRY, MV .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1984, 392 (1802) :45-57

[7]

Boisvert Ronald F., 2010, NIST HDB MATH FUNCTI

[8] Electronic states of graphene nanoribbons studied with the Dirac equation [J].

Brey, L ;

Fertig, HA .

PHYSICAL REVIEW B, 2006, 73 (23)

[9] Localized states at zigzag edges of bilayer graphene [J].

Castro, Eduardo V. ;

Peres, N. M. R. ;

Lopes dos Santos, J. M. B. ;

Castro Neto, A. H. ;

Guinea, F. .

PHYSICAL REVIEW LETTERS, 2008, 100 (02)

[10] All-strain based valley filter in graphene nanoribbons using snake states [J].

Cavalcante, L. S. ;

Chaves, A. ;

da Costa, D. R. ;

Farias, G. A. ;

Peeters, F. M. .

PHYSICAL REVIEW B, 2016, 94 (07)

← 1 2 3 4 5 →