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Symmetry breaking induced bandgap opening in epitaxial germanene on WSe2

Germanene has attracted much attention because the material was predicted to host Dirac fermions. However, the synthesis of germanene is still in its infancy; moreover, the predicted tiny bandgap induced by the spin–orbit coupling is far from practical applications for nanoelectronic devices. Herein...

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Published in:Applied physics letters 2022-08, Vol.121 (5)
Main Authors: Wu, Qilong, Bagheri Tagani, Meysam, Tian, Qiwei, Izadi Vishkayi, Sahar, Zhang, Li, Yin, Long-Jing, Tian, Yuan, Zhang, Lijie, Qin, Zhihui
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cited_by cdi_FETCH-LOGICAL-c327t-8ad2b55ec4322dee37ba022cbbea78cbadd0b37e907a7d1679577bdc436fffe33
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container_issue 5
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container_title Applied physics letters
container_volume 121
creator Wu, Qilong
Bagheri Tagani, Meysam
Tian, Qiwei
Izadi Vishkayi, Sahar
Zhang, Li
Yin, Long-Jing
Tian, Yuan
Zhang, Lijie
Qin, Zhihui
description Germanene has attracted much attention because the material was predicted to host Dirac fermions. However, the synthesis of germanene is still in its infancy; moreover, the predicted tiny bandgap induced by the spin–orbit coupling is far from practical applications for nanoelectronic devices. Herein, quasi-freestanding germanene with linear dispersion relation of the band structure is well grown on a WSe2/Au(100) substrate. Band structure calculations reveal that the interaction of germanene with the substrate destroys the sublattice symmetry. The energy-dependent contribution of σ orbitals responsible for band crossing at the Fermi level around the Γ point induces asymmetric density of states at the Dirac point. Upon annealing in ultra-high vacuum, we observe a bandgap opening in germanene of about ∼0.17 eV, which is attributed to a sublattice symmetry breaking in germanene and the emergence of a net electric field. This work provides an effective method to tune or tailor the electronic properties of germanene, paving the way to germanene-based field-effect applications.
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); AIP Journals (American Institute of Physics)
subjects Applied physics
Band structure of solids
Broken symmetry
Electric fields
Energy gap
Fermions
High vacuum
Nanoelectronics
Nanotechnology devices
Spin-orbit interactions
Substrates
Symmetry
title Symmetry breaking induced bandgap opening in epitaxial germanene on WSe2
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