Observation of interlayer phonon modes in van der Waals heterostructures

C. H. Lui; Zhipeng Ye; Chao Ji; Kuan Chang Chiu; Cheng Tse Chou; Trond I. Andersen; Casie Means-Shively; Heidi Anderson; Jenn Ming Wu; Tim Kidd; Yi Hsien Lee; Rui He

doi:10.1103/PhysRevB.91.165403

Observation of interlayer phonon modes in van der Waals heterostructures

C. H. Lui, Zhipeng Ye, Chao Ji, Kuan Chang Chiu, Cheng Tse Chou, Trond I. Andersen, Casie Means-Shively, Heidi Anderson, Jenn Ming Wu, Tim Kidd, Yi Hsien Lee, Rui He

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

173 Scopus citations

Abstract

We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 heterobilayers and twisted MoS2 bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30-40cm-1) that arise from the layer-breathing mode (LBM) vibration between the two incommensurate TMD monolayers in these structures. The LBM Raman intensity correlates strongly with the suppression of photoluminescence that arises from interlayer charge transfer. The LBM is generated only in bilayer areas with direct layer-layer contact and an atomically clean interface. Its frequency also evolves systematically with the relative orientation between the two layers. Our research demonstrates that the LBM can serve as a sensitive probe to the interface environment and interlayer interactions in van der Waals materials.

Original language	English
Article number	165403
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	91
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.91.165403
State	Published - Apr 8 2015

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title = "Observation of interlayer phonon modes in van der Waals heterostructures",

abstract = "We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 heterobilayers and twisted MoS2 bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30-40cm-1) that arise from the layer-breathing mode (LBM) vibration between the two incommensurate TMD monolayers in these structures. The LBM Raman intensity correlates strongly with the suppression of photoluminescence that arises from interlayer charge transfer. The LBM is generated only in bilayer areas with direct layer-layer contact and an atomically clean interface. Its frequency also evolves systematically with the relative orientation between the two layers. Our research demonstrates that the LBM can serve as a sensitive probe to the interface environment and interlayer interactions in van der Waals materials.",

author = "Lui, {C. H.} and Zhipeng Ye and Chao Ji and Chiu, {Kuan Chang} and Chou, {Cheng Tse} and Andersen, {Trond I.} and Casie Means-Shively and Heidi Anderson and Wu, {Jenn Ming} and Tim Kidd and Lee, {Yi Hsien} and Rui He",

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doi = "10.1103/PhysRevB.91.165403",

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T1 - Observation of interlayer phonon modes in van der Waals heterostructures

AU - Lui, C. H.

AU - Ye, Zhipeng

AU - Ji, Chao

AU - Chiu, Kuan Chang

AU - Chou, Cheng Tse

AU - Andersen, Trond I.

AU - Means-Shively, Casie

AU - Anderson, Heidi

AU - Wu, Jenn Ming

AU - Kidd, Tim

AU - Lee, Yi Hsien

AU - He, Rui

PY - 2015/4/8

Y1 - 2015/4/8

N2 - We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 heterobilayers and twisted MoS2 bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30-40cm-1) that arise from the layer-breathing mode (LBM) vibration between the two incommensurate TMD monolayers in these structures. The LBM Raman intensity correlates strongly with the suppression of photoluminescence that arises from interlayer charge transfer. The LBM is generated only in bilayer areas with direct layer-layer contact and an atomically clean interface. Its frequency also evolves systematically with the relative orientation between the two layers. Our research demonstrates that the LBM can serve as a sensitive probe to the interface environment and interlayer interactions in van der Waals materials.

AB - We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 heterobilayers and twisted MoS2 bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30-40cm-1) that arise from the layer-breathing mode (LBM) vibration between the two incommensurate TMD monolayers in these structures. The LBM Raman intensity correlates strongly with the suppression of photoluminescence that arises from interlayer charge transfer. The LBM is generated only in bilayer areas with direct layer-layer contact and an atomically clean interface. Its frequency also evolves systematically with the relative orientation between the two layers. Our research demonstrates that the LBM can serve as a sensitive probe to the interface environment and interlayer interactions in van der Waals materials.

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DO - 10.1103/PhysRevB.91.165403

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VL - 91

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 16

M1 - 165403

ER -

Observation of interlayer phonon modes in van der Waals heterostructures

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