Nanoscale electromechanical resonators as probes of the charge density wave transition in NbSe$_2$

Details Nanoscale electromechanical resonators as probes of the charge density wave transition in NbSe$_2$ Nanoscale electromechanical resonators as probes of the charge density wave transition in NbSe$_2$

2010-04-20

arxiv.org/abs/1004.3453v1

Phys. Rev. B 82, 155432 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.82.155432

We study nanoelectromechanical resonators fabricated from suspended flakes of NbSe$_2$ (thickness$\sim$30-50 nm) to probe charge density wave (CDW) physics at nanoscale. Variation of elastic and electronic properties accompanying the CDW phase transition (around 30 K) are investigated simultaneously using the devices as self-sensing heterodyne mixers. Elastic modulus is observed to change by 10 per cent, an amount significantly larger than what had been reported earlier in the case of bulk crystals. We also study the modulation of conductance by electric field effect, and examine its relation to the order parameter and the CDW energy gap at the Fermi surface.

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