Charge transport and electron-hole asymmetry in low-mobility graphene/hexagonal boron nitride heterostructures

Graphene/hexagonal boron nitride (G/h-BN) heterostructures offer an excellent platform for developing nanoelectronic devices and for exploring correlated states in graphene under modulation by a periodic superlattice potential. Here, we report on transport measurements of nearly 0°-twisted G/h-BN heterostructures. The heterostructures investigated are prepared by dry transfer and thermally annealing processes and are in the low mobility regime (approximately 3000 cm2 V-1s-1 at 1.9 K). The replica Dirac spectra and Hofstadter butterfly spectra are observed on the hole transport side, but not on the electron transport side, of the heterostructures. We associate the observed electron-hole asymmetry with the presence of a large difference between the opened gaps in the conduction and valence bands and a strong enhancement in the interband contribution to the conductivity on the electron transport side in the low-mobility G/h-BN heterostructures. We also show that the gaps opened at the central Dirac point and the hole-branch secondary Dirac point are large, suggesting the presence of strong graphene-substrate interaction and electron-electron interaction in our G/h-BN heterostructures. Our results provide additional helpful insight into the transport mechanism in G/h-BN heterostructures.

Lin, LiPeking University (författare)
Huang, Guang YaoPeking University (författare)
Kang, N.Peking University (författare)
Zhang, JincanPeking University (författare)
Peng, HailinPeking University (författare)
Liu, ZhongfanPeking University (författare)
Xu, H. Q.Lund University,Lunds universitet,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Peking University(Swepub:lu)ftf-hxu (författare)
Peking UniversityFasta tillståndets fysik (creator_code:org_t)

Av författaren/redakt...: Li, Jiayu; Lin, Li; Huang, Guang Yao; Kang, N.; Zhang, Jincan; Peng, Hailin; visa fler...; Liu, Zhongfan; Xu, H. Q.; visa färre...

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