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Charge Density Wave Order and Electronic Phase Transitions in a Dilute d-Band Semiconductor
Huandong Chen1, Boyang Zhao1, Josh Mutch2
1Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089, USA.
Advanced Materials (Deerfield Beach, Fla.)
|August 4, 2023
Summary
Charge density wave (CDW) order was investigated in the dilute semiconductor BaTiS3. Findings suggest a combination of electron-phonon and electron-electron interactions drive CDW phenomena and phase transitions.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Charge density wave (CDW) order is a fundamental phenomenon typically observed in metallic systems.
- Understanding CDW in semiconductors, especially at low carrier concentrations, requires exploring novel mechanisms beyond Fermi surface nesting.
- BaTiS3 presents an intriguing case for studying CDW in a dilute d-band semiconductor system.
Purpose of the Study:
- To investigate the charge density wave (CDW) order and hysteretic phase transitions in BaTiS3.
- To elucidate the underlying physical mechanisms responsible for CDW phenomena in this dilute semiconductor.
- To establish BaTiS3 as a model system for exploring CDW physics in dilute electronic systems.
Main Methods:
- Combined experimental techniques including electrical transport measurements and synchrotron X-ray diffraction.
- Theoretical investigations using density-functional theory (DFT) calculations.
- Correlating experimental observations with theoretical predictions to understand phase transitions.
Main Results:
- Observed charge density wave (CDW) order and a series of hysteretic phase transitions in BaTiS3.
- Evidence suggesting that both electron-phonon coupling and electron-electron interactions contribute to the observed phenomena.
- Identification of BaTiS3 as a unique material for studying CDW physics at the dilute filling limit.
Conclusions:
- The charge density wave (CDW) order and phase transitions in BaTiS3 are driven by a combination of electron-phonon coupling and electron-electron interactions.
- BaTiS3 serves as a significant platform for exploring novel electronic phases and CDW physics in dilute systems.
- This research opens avenues for the development of new electronic devices based on unique CDW properties.
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