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Giant Thermal Switching via Phase Transition in MoTe2
Zhuyao Chang1, Nemo McIntosh2, Zhao Liu1
1Department of Physics and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Shijiazhuang 050024, China.
The Journal of Physical Chemistry Letters
|January 19, 2026
Summary
Researchers engineered molybdenum ditelluride (MoTe2) to control heat flow. A phase transition dramatically increased thermal conductivity by 270%, enabling dynamic thermal management in electronics and energy harvesting.
Area of Science:
- Condensed matter physics
- Nanoscience
- Materials science
Background:
- Tailor-made thermal properties are crucial for electronics thermal management and energy harvesting.
- Dynamically controlling heat conduction states offers real-time heat flow management.
Purpose of the Study:
- To investigate phase-engineering in MoTe2 for tunable thermal conductivity.
- To explore the potential for dynamic control of heat flow in 2D materials.
Main Methods:
- Utilized phase-engineering in Molybdenum ditelluride (MoTe2).
- Performed first-principles calculations to analyze thermal conductivity changes.
- Investigated the role of four-phonon processes in different polymorphs.
Main Results:
- Achieved a ~270% increase in thermal conductivity at room temperature upon phase transition (2H to 1T').
- Identified distinct four-phonon process effects in the 2H and 1T' phases as the cause.
- Demonstrated ultrafast and reversible 2H ↔ 1T' phase transitions.
Conclusions:
- Phase-engineering in MoTe2 offers a pathway to giant, tunable thermal conductivity.
- The reversible phase transition can be triggered by electric fields, light, and THz pulses.
- This provides a novel mechanism for advanced thermal management and energy harvesting applications.
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