Breathing modes in few-layer MoTe2 activated by h-BN encapsulation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU139941" target="_blank" >RIV/00216305:26620/20:PU139941 - isvavai.cz</a>

Výsledek na webu

<a href="https://aip.scitation.org/doi/10.1063/1.5128048" target="_blank" >https://aip.scitation.org/doi/10.1063/1.5128048</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5128048" target="_blank" >10.1063/1.5128048</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Breathing modes in few-layer MoTe2 activated by h-BN encapsulation

Popis výsledku v původním jazyce

The encapsulation of few-layer transition metal dichalcogenides (TMDs) in hexagonal boron nitride (h-BN) is known to significantly improve their optical and electronic properties. However, it may be expected that the h-BN encapsulation may also affect the vibration properties of TMDs due to an atomically flat surface of h-BN layers. In order to study its effect on interlayer interactions in few-layer TMDs, we investigate low-energy Raman scattering spectra of bi- and trilayer MoTe2. Surprisingly, three breathing modes are observed in the Raman spectra of the structures deposited on or encapsulated in h-BN as compared to a single breathing mode for the flakes deposited on a SiO2/Si substrate. The shear mode is not affected by changing the MoTe2 environment. The emerged structure of breathing modes is ascribed to the apparent interaction between the MoTe2 layer and the bottom h-BN flake. The structure becomes visible due to a high-quality surface of the former flake. Consequently, the observed triple structure of breathing modes originates from the combination modes due to interlayer and layer-substrate interactions. Our results confirm that the h-BN encapsulation substantially affects the vibration properties of layered materials. Published under license by AIP Publishing.

Název v anglickém jazyce

Breathing modes in few-layer MoTe2 activated by h-BN encapsulation

Popis výsledku anglicky

The encapsulation of few-layer transition metal dichalcogenides (TMDs) in hexagonal boron nitride (h-BN) is known to significantly improve their optical and electronic properties. However, it may be expected that the h-BN encapsulation may also affect the vibration properties of TMDs due to an atomically flat surface of h-BN layers. In order to study its effect on interlayer interactions in few-layer TMDs, we investigate low-energy Raman scattering spectra of bi- and trilayer MoTe2. Surprisingly, three breathing modes are observed in the Raman spectra of the structures deposited on or encapsulated in h-BN as compared to a single breathing mode for the flakes deposited on a SiO2/Si substrate. The shear mode is not affected by changing the MoTe2 environment. The emerged structure of breathing modes is ascribed to the apparent interaction between the MoTe2 layer and the bottom h-BN flake. The structure becomes visible due to a high-quality surface of the former flake. Consequently, the observed triple structure of breathing modes originates from the combination modes due to interlayer and layer-substrate interactions. Our results confirm that the h-BN encapsulation substantially affects the vibration properties of layered materials. Published under license by AIP Publishing.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Physics Letters

ISSN

0003-6951

e-ISSN

1077-3118

Svazek periodika

116

Číslo periodika v rámci svazku

19

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

„191601-1“-„191601-5“

Kód UT WoS článku

000543738600001

EID výsledku v databázi Scopus

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