Image potential states of germanene

Bogdana Borca; Carolien Castenmiller; Martina Tsvetanova; Kai Sotthewes; Alexander N. Rudenko; Harold J.W. Zandvliet

doi:10.1088/2053-1583/ab96cf

Image potential states of germanene

Bogdana Borca^*, Carolien Castenmiller, Martina Tsvetanova, Kai Sotthewes, Alexander N. Rudenko, Harold J.W. Zandvliet^*

^*Corresponding author for this work

Physics of Interfaces and Nanomaterials

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Abstract

We have measured the two-dimensional image potential states (IPS) of a germanene layer synthesized on a Ge2Pt crystal using scanning tunnelling microscopy and spectroscopy. The IPS spectrum of germanene exhibits several differences as compared to the IPS spectrum of pristine Ge(001). First, the n = 1 peak of the Rydberg series of the IPS spectrum of germanene has two contributions, labelled n = 1- and n = 1+, respectively. The peak at the lower energy side is weaker and is associated to the mirror-symmetric state with opposite parity. The appearance of this peak indicates that the interaction between the germanene layer and the substrate is very weak. Second, the work function of germanene is about 0.75 eV lower in energy than the work function of Ge(001). This large difference in work function of germanene and pristine Ge(001) is in agreement with first-principles calculations.

Original language	English
Article number	035021
Journal	2D Materials
Volume	7
Issue number	3
DOIs	https://doi.org/10.1088/2053-1583/ab96cf
Publication status	Published - Jul 2020

Keywords

UT-Hybrid-D

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title = "Image potential states of germanene",

abstract = "We have measured the two-dimensional image potential states (IPS) of a germanene layer synthesized on a Ge2Pt crystal using scanning tunnelling microscopy and spectroscopy. The IPS spectrum of germanene exhibits several differences as compared to the IPS spectrum of pristine Ge(001). First, the n = 1 peak of the Rydberg series of the IPS spectrum of germanene has two contributions, labelled n = 1- and n = 1+, respectively. The peak at the lower energy side is weaker and is associated to the mirror-symmetric state with opposite parity. The appearance of this peak indicates that the interaction between the germanene layer and the substrate is very weak. Second, the work function of germanene is about 0.75 eV lower in energy than the work function of Ge(001). This large difference in work function of germanene and pristine Ge(001) is in agreement with first-principles calculations.",

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T1 - Image potential states of germanene

AU - Borca, Bogdana

AU - Castenmiller, Carolien

AU - Tsvetanova, Martina

AU - Sotthewes, Kai

AU - Rudenko, Alexander N.

AU - Zandvliet, Harold J.W.

N1 - IOP deal

PY - 2020/7

Y1 - 2020/7

N2 - We have measured the two-dimensional image potential states (IPS) of a germanene layer synthesized on a Ge2Pt crystal using scanning tunnelling microscopy and spectroscopy. The IPS spectrum of germanene exhibits several differences as compared to the IPS spectrum of pristine Ge(001). First, the n = 1 peak of the Rydberg series of the IPS spectrum of germanene has two contributions, labelled n = 1- and n = 1+, respectively. The peak at the lower energy side is weaker and is associated to the mirror-symmetric state with opposite parity. The appearance of this peak indicates that the interaction between the germanene layer and the substrate is very weak. Second, the work function of germanene is about 0.75 eV lower in energy than the work function of Ge(001). This large difference in work function of germanene and pristine Ge(001) is in agreement with first-principles calculations.

AB - We have measured the two-dimensional image potential states (IPS) of a germanene layer synthesized on a Ge2Pt crystal using scanning tunnelling microscopy and spectroscopy. The IPS spectrum of germanene exhibits several differences as compared to the IPS spectrum of pristine Ge(001). First, the n = 1 peak of the Rydberg series of the IPS spectrum of germanene has two contributions, labelled n = 1- and n = 1+, respectively. The peak at the lower energy side is weaker and is associated to the mirror-symmetric state with opposite parity. The appearance of this peak indicates that the interaction between the germanene layer and the substrate is very weak. Second, the work function of germanene is about 0.75 eV lower in energy than the work function of Ge(001). This large difference in work function of germanene and pristine Ge(001) is in agreement with first-principles calculations.

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SN - 2053-1583

VL - 7

JO - 2D Materials

JF - 2D Materials

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ER -

Image potential states of germanene

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Keywords

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