Ultrasharp Lateral p-n Junctions in Modulation-Doped Graphene br

被引：22

作者：

Balgley, Jesse ^{[1
]}

Butler, Jackson ^{[1
]}

Biswas, Sananda ^{[2
]}

Ge, Zhehao ^{[3
]}

Lagasse, Samuel ^{[4
]}

Taniguchi, Takashi ^{[5
]}

Watanabe, Kenji ^{[6
]}

Cothrine, Matthew ^{[7
]}

Mandrus, David G. ^{[7
,8
]}

Velasco, Jairo, Jr. ^{[3
]}

Valenti, Roser ^{[2
]}

Henriksen, Erik A. ^{[1
]}

机构：

[1] Washington Univ, Dept Phys, St Louis, MO 63130 USA

[2] Goethe Univ Frankfurt, Inst Theoret Phys, D-60438 Frankfurt, Germany

[3] UC Santa Cruz, Phys Dept, Santa Cruz, CA 95064 USA

[4] US Navy, Res Lab, Elect Sci & Technol Div, Washington, DC 20375 USA

[5] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki 3050044, Japan

[6] Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba, Ibaraki 3050044, Japan

[7] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[8] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

NANO LETTERS | 2022年 / 22卷 / 10期

基金：

美国国家科学基金会;

关键词：

Graphene; -RuCl3; p-n junction; electronic transport; scanning tunneling microscopy; density functional theory; DIRAC FERMIONS; OPTICS;

D O I：

10.1021/acs.nanolett.2c00785

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We demonstrate ultrasharp (less than or similar to 10 nm) lateral p-n junctions in graphene using electronic transport, scanningtunneling microscopy, andfirst-principles calculations. The p-n junction lies at the boundary between differentially doped regionsof a graphene sheet, where one side is intrinsic and the other ischarge-doped by proximity to aflake of alpha-RuCl3across a thininsulating barrier. We extract the p-n junction contribution to thedevice resistance to place bounds on the junction width. Weachieve an ultrasharp junction when the boundary between theintrinsic and doped regions is defined by a cleaved crystalline edgeof alpha-RuCl3located 2 nm from the graphene. Scanning tunnelingspectroscopy in heterostructures of graphene, hexagonal boronnitride, and alpha-RuCl3shows potential variations on a sub 10 nmlength scale. First-principles calculations reveal that the charge-doping of graphene decays sharply over just nanometers from theedge of the alpha-RuCl3flake

引用

页码：4124 / 4130

页数：7

共 38 条

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