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Related Experiment Video

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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

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Structural Phase Transition and Interlayer Coupling in Few-Layer 1T' and T_d MoTe₂.

Yeryun Cheon¹, Soo Yeon Lim¹, Kangwon Kim¹

¹Department of Physics, Sogang University, Seoul 04107, Korea.

|January 22, 2021

Summary

This summary is machine-generated.

Few-layer molybdenum ditelluride (MoTe2) exhibits distinct 1T' and Td phases. Thickness influences phase transitions, with reduced layers suppressing transitions and revealing metastable phases.

Keywords:

MoTe2 group theory analysis interlayer vibration modes linear chain model molybdenum ditelluride polarized Raman spectroscopy structural phase transition

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Molybdenum ditelluride (MoTe2) exists in multiple phases, including 1T' and Td, with varying electronic and structural properties.
Understanding phase transitions and interlayer coupling in few-layer MoTe2 is crucial for its electronic applications.

Purpose of the Study:

To investigate the structural phases and phase transition behaviors of few-layer MoTe2 using Raman spectroscopy.
To analyze the interlayer coupling strengths and in-plane anisotropy in different MoTe2 phases.
To explore the influence of sample thickness on the temperature-driven phase transition.

Main Methods:

Polarized Raman spectroscopy was employed to analyze mechanically exfoliated few-layer MoTe2 samples.
The linear chain model was utilized to extract interlayer coupling strengths from observed vibration modes.
Temperature-dependent Raman measurements were conducted to study phase transition dynamics.

Main Results:

Both 1T' and Td phases of few-layer MoTe2 were observed at room temperature, showing distinct interlayer vibration modes.
Strong in-plane anisotropy was detected in both 1T' and Td phases.
The temperature-driven phase transition from 1T' to Td phase is suppressed with decreasing thickness, exhibiting sample-to-sample variation.
Intermediate phases, neither 1T' nor Td, were observed, suggesting the existence of metastable phases.

Conclusions:

Few-layer MoTe2 exhibits complex phase behavior influenced by thickness and interlayer coupling.
The suppression of the phase transition in thinner samples highlights the importance of dimensionality in determining material properties.
The observation of metastable phases indicates potential for novel material engineering in MoTe2 systems.