Tunable multi-bands in twisted double bilayer graphene

Zhu, Yujian1; Chen, Yiwei1; Li, Qingxin1; Chen, Yongdao2; Huang, Yan1; Zhu, Wang1; An, Dongdong1; Song, Junwei1; Gan, Qikang1; Wang, Kaiyuan1; Wei, Lingnan1; Zong, Qijun1; Watanabe, Kenji3; Taniguchi, Takashi3; Wang, Haolin1,6; Huang, Li2; Xian, Lede4,5; Sun, Liang1; Yu, Geliang1; Wang, Lei1

2022-07-01

10.1088/2053-1583/ac69bb

2D Materials   影响因子和分区

2053-1583

The bandstructure of a material, playing an important role in its electron transport property, is usually governed by the lattice configuration. Materials with a field-effect tunable band, such as bilayer [1] and rhombohedral trilayer graphene [2, 3], are more flexible for electronic applications. Here, on dual-gated twisted double bilayer graphene (TDBG) samples with small twist angle around 1(circle), we observe vertical electric-field-tunable bandstructures at multiple moire fillings with bandgap values continuously varying from zero to tens of mili-electron volts. Moreover, within the first moire filling on both electron and hole sides, the carrier transport deviates from Fermi liquid behavior, with measured resistivity exhibiting linear temperature dependence between 1.5 K and 50 K. Furthermore, under a vertical magnetic field, the coupling between the two bilayer graphene layers can also be turned on and off by a displacement field. Our results suggest TDBG with small twist angle is a platform for studying the evolution of multiple electric field tunable moire bands and the resulting emergent correlated electronic phases.

graphene flat band twistronics electronic transport

SCI ; EI

英语

其他

National Key Projects for Research and Development of China[2021YFA1400400] ; National Natural Science Foundation of China[61804117,12074173,11774142] ; Program for Innovative Talents and Entrepreneur in Jiangsu[JSSCTD202101] ; Shenzhen Basic Research Fund[JCYJ20180504165817769] ; CREST, JST[JPMJCR15F3]

Materials Science

Materials Science, Multidisciplinary

WOS:000793505100001

IOP Publishing Ltd

20222112154282

Electric fields ; Electron transport properties ; Fermi liquids ; Temperature distribution

Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Nanotechnology:761 ; Chemical Products Generally:804

Web of Science

1.Nanjing Univ, Sch Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
3.Natl Inst Mat Sci, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan
4.Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China
5.Max Planck Inst Struct & Dynam Matter, Ctr Free Elect Laser Sci, D-22761 Hamburg, Germany
6.Xidian Univ, Sch Adv Mat & Nanotechnol, Xian 710071, Shaanxi, Peoples R China

Zhu, Yujian,Chen, Yiwei,Li, Qingxin,et al. Tunable multi-bands in twisted double bilayer graphene[J]. 2D Materials,2022,9(3).

Zhu, Yujian.,Chen, Yiwei.,Li, Qingxin.,Chen, Yongdao.,Huang, Yan.,...&Wang, Lei.(2022).Tunable multi-bands in twisted double bilayer graphene.2D Materials,9(3).

Zhu, Yujian,et al."Tunable multi-bands in twisted double bilayer graphene".2D Materials 9.3(2022).