Charge puddles in germanene

Q. Yao, Z. Jiao, P. Bampoulis, Lijie Zhang (Corresponding Author), A. N. Rudenko, M. I. Katsnelson, H. J.W. Zandvliet (Corresponding Author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We report an investigation of the electronic inhomogeneities in a single germanene layer grown on a molybdenum disulfide (MoS 2 ) substrate. Using scanning tunneling microscopy and spectroscopy, we have recorded spatial maps of the Dirac point of germanene. The Dirac point maps reveal the presence of charge puddles in the germanene sheet. The Dirac point varies from -30 meV to +15 meV, corresponding to a charge density in the puddles in the range of 2.6 × 10 -3 electrons to 6.6 × 10 -4 holes per nm 2 . The radius of these puddles is about 10-20 nm, resulting in a total charge of the order of one charge carrier per puddle. The defect concentration in the top layer of the MoS 2 substrate is very comparable to the density of charge puddles, suggesting that the charge puddles are caused by the charged defects in the top layer of the MoS 2 substrate.

Original languageEnglish
Article number041601
JournalApplied physics letters
Volume114
Issue number4
DOIs
Publication statusPublished - 28 Jan 2019

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molybdenum disulfides
defects
scanning tunneling microscopy
charge carriers
inhomogeneity
radii
electronics
spectroscopy
electrons

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Yao, Q., Jiao, Z., Bampoulis, P., Zhang, L., Rudenko, A. N., Katsnelson, M. I., & Zandvliet, H. J. W. (2019). Charge puddles in germanene. Applied physics letters, 114(4), [041601]. https://doi.org/10.1063/1.5085304
Yao, Q. ; Jiao, Z. ; Bampoulis, P. ; Zhang, Lijie ; Rudenko, A. N. ; Katsnelson, M. I. ; Zandvliet, H. J.W. / Charge puddles in germanene. In: Applied physics letters. 2019 ; Vol. 114, No. 4.
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Yao, Q, Jiao, Z, Bampoulis, P, Zhang, L, Rudenko, AN, Katsnelson, MI & Zandvliet, HJW 2019, 'Charge puddles in germanene' Applied physics letters, vol. 114, no. 4, 041601. https://doi.org/10.1063/1.5085304

Charge puddles in germanene. / Yao, Q.; Jiao, Z.; Bampoulis, P.; Zhang, Lijie (Corresponding Author); Rudenko, A. N.; Katsnelson, M. I.; Zandvliet, H. J.W. (Corresponding Author).

In: Applied physics letters, Vol. 114, No. 4, 041601, 28.01.2019.

Research output: Contribution to journalArticleAcademicpeer-review

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Yao Q, Jiao Z, Bampoulis P, Zhang L, Rudenko AN, Katsnelson MI et al. Charge puddles in germanene. Applied physics letters. 2019 Jan 28;114(4). 041601. https://doi.org/10.1063/1.5085304