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Atomic-scale strain manipulation of a charge density wave.

Shang Gao¹, Felix Flicker^2,3, Raman Sankar^4,5

¹Department of Physics, Boston College, Chestnut Hill, MA 02467.

Proceedings of the National Academy of Sciences of the United States of America

|June 20, 2018

Summary

Strain engineering in quantum materials like 2H-NbSe2 dramatically alters charge density wave (CDW) ordering. This study reveals how applied strain modifies electronic and phonon properties to control CDW geometry and wavevectors.

Keywords:

NbSe2 charge density waves scanning tunneling microscopy strain

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Materials

Background:

Charge density waves (CDWs) are fundamental electronic instabilities in quantum materials.
Controlling CDW wavevector and geometry is challenging, especially in higher dimensions where Fermi surface nesting is limited.

Purpose of the Study:

To implement a strain-engineering method compatible with low-temperature scanning tunneling microscopy/spectroscopy (STM/S).
To investigate the effects of strain on CDW properties in 2H-NbSe2.
To unveil the microscopic mechanism of CDW formation under strain.

Main Methods:

Low-temperature scanning tunneling microscopy/spectroscopy (STM/S) measurements.
Application of a novel strain-engineering technique.
Theoretical analysis of electronic band structure and phonon dispersion.

Main Results:

Demonstrated successful strain-engineering of CDWs in 2H-NbSe2.
Observed significant changes in CDW ordering wavevector and geometry due to small strain-induced modifications.
Linked strain-induced changes in electronic band structure and phonon dispersion to CDW alterations.

Conclusions:

Strain engineering provides a powerful tool to manipulate CDW states in quantum materials.
The study elucidates the microscopic mechanisms governing CDW formation influenced by strain.
The developed method is broadly applicable to other spectroscopic techniques for engineering electronic states in materials sensitive to strain or symmetry breaking.