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Gate Tunable Cooperativity between Vibrational Modes.

Parmeshwar Prasad¹, Nishta Arora¹, A K Naik¹

¹Indian Institute of Science , Bangalore , India , 560012.

|August 14, 2019

Summary

Researchers demonstrated strong coupling between vibrational modes in MoS2 drum resonators at room temperature. This finding is significant for studying quantum effects in macroscopic objects and coherent phonon manipulation.

Keywords:

NEMS cooperativity nano resonator optomechanics parametric pumping strong coupling

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Area of Science:

Condensed Matter Physics
Nanotechnology
Quantum Mechanics

Background:

Coupling mechanical resonators with optical or microwave cavities, or other mechanical resonators, enables observation of effects like sideband cooling and phonon manipulation.
Exploring novel materials for enhanced mechanical resonator properties is crucial for advancing quantum technologies.

Purpose of the Study:

To demonstrate strong coupling between different vibrational modes of molybdenum disulfide (MoS2) drum resonators at room temperature.
To investigate the tunability of this coupling via electrical bias.
To assess the potential for coherent phonon transfer and quantum effect studies in macroscopic systems.

Main Methods:

Fabrication of MoS2 drum resonators.
Experimental setup to induce and measure coupling between vibrational modes.
Application of direct current (DC) gate bias to tune coupling strength (cooperativity).

Main Results:

Successfully demonstrated strong intermodal and intramodal coupling between vibrational modes in MoS2 drum resonators.
Observed that cooperativity can be tuned over an order of magnitude by adjusting the DC gate bias.
Achieved a high measured cooperativity of approximately 900 at room temperature.

Conclusions:

The demonstrated strong coupling and high cooperativity in MoS2 resonators at room temperature are promising for coherent phonon manipulation.
The results indicate that phonon populations can be coherently transferred between modes for over 500 cycles.
This system offers a valuable platform for exploring quantum effects in macroscopic objects.