Probing weak localization in chemical vapor deposition graphene wide constriction using scanning gate microscopy

被引：8

作者：

Chuang, C. ^{[1
,2
]}

Matsunaga, M. ^{[2
]}

Liu, F-H ^{[3
]}

Woo, T-P ^{[1
]}

Aoki, N. ^{[2
]}

Lin, L-H ^{[4
]}

Wu, B-Y ^{[3
]}

Ochiai, Y. ^{[2
]}

Liang, C-T ^{[1
,3
]}

机构：

[1] Natl Taiwan Univ, Dept Phys, Taipei 106, Taiwan

[2] Chiba Univ, Grad Sch Adv Integrat Sci, Chiba 2638522, Japan

[3] Natl Taiwan Univ, Grad Inst Appl Phys, Taipei 106, Taiwan

[4] Natl Chiayi Univ, Dept Elect, Chiayi 600, Taiwan

来源：

NANOTECHNOLOGY | 2016年 / 27卷 / 07期

基金：

日本学术振兴会;

关键词：

weak localization; chemical vapor deposition graphene; scanning gate microscopy; TRANSPORT;

D O I：

10.1088/0957-4484/27/7/075601

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Low-temperature scanning gate microscopy (LT-SGM) studies of graphene allow one to obtain important spatial information regarding coherent transport such as weak localization (WL) and universal conductance fluctuations. Although fascinating LT-SGM results on pristine graphene prepared by mechanical exfoliation have been reported in the literature, there appears to be a dearth of LT-SGM results on chemical vapor deposition (CVD)-grown graphene whose large scale and flexible substrate transferability make it an ideal candidate for coherent electronic applications. To this end, we have performed LT-SGM studies on CVD-grown graphene wide constriction (0.8 mu m), which can be readily prepared by cost-effective optical lithography fully compatible with those in wafer foundry, in the WL regime. We find that the movable local gate can sensitively modulate the total conductance of the CVD graphene constriction possibly due to the intrinsic grain boundaries and merged domains, a great advantage for applications in coherent electronics. Moreover, such a conductance modulation by LT-SGM provides an additional, approximately magnetic-field-independent probe for studying coherent transport such as WL in graphene and spatial conductance variation.

引用

页数：7

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