Absorptive pinhole collimators for ballistic Dirac fermions in graphene

被引：0
作者：
Arthur W. Barnard
Alex Hughes
Aaron L. Sharpe
Kenji Watanabe
Takashi Taniguchi
David Goldhaber-Gordon
机构：
[1] Stanford University,Department of Physics
[2] Stanford University,Department of Applied Physics
[3] National Institute for Materials Science,undefined
来源：
Nature Communications | / 8卷
关键词：
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Ballistic electrons in solids can have mean free paths far larger than the smallest features patterned by lithography. This has allowed development and study of solid-state electron-optical devices such as beam splitters and quantum point contacts, which have informed our understanding of electron flow and interactions. Recently, high-mobility graphene has emerged as an ideal two-dimensional semimetal that hosts unique chiral electron-optical effects due to its honeycomb crystalline lattice. However, this chiral transport prevents the simple use of electrostatic gates to define electron-optical devices in graphene. Here we present a method of creating highly collimated electron beams in graphene based on collinear pairs of slits, with absorptive sidewalls between the slits. By this method, we achieve beams with angular width 18° or narrower, and transmission matching classical ballistic predictions.
引用
收藏
相关论文
共 78 条
[1]  
Oliver WD(1999)Hanbury Brown and Twiss-type experiment with electrons Science 284 299-301
[2]  
Kim J(1999)The Fermionic Hanbury Brown and Twiss experiment Science 284 296-298
[3]  
Liu RC(1990)Electron-beam collimation with a quantum point contact Phys. Rev. B 41 1274-1277
[4]  
Yamamoto Y(2011)Gate-defined graphene quantum point contact in the quantum Hall regime Phys. Rev. Lett. 107 036602-7940
[5]  
Henny M(1990)Electrostatic electron lens in the ballistic regime Phys. Rev. B 41 7937-225
[6]  
Molenkamp LW(2010)Smooth electron waveguides in graphene Phys. Rev. B 81 245431-8575
[7]  
Nakaharai S(2011)Gate-controlled guiding of electrons in graphene Nat. Nanotechnol. 6 222-709
[8]  
Williams JR(1989)Coherent electron focusing with quantum point contacts in a two-dimensional electron gas Phys. Rev. B 39 8556-204
[9]  
Marcus CM(1979)2-Dimensional electron-gas at a semiconductor-semiconductor interface Solid State Commun. 29 705-669
[10]  
Sivan U(2005)Experimental observation of the quantum Hall effect and Berry’s phase in graphene Nature 438 201-625
12345678