Gate-controlled electromechanical backaction induced by a quantum dot

Okazaki, Yoshiaki; Mahboob, Imran; Onomitsu, Koji; Sasaki, Satoshi; Yamaguchi, Hiroshi

doi:10.1038/ncomms11132

Cited by 52 publications

(48 citation statements)

References 35 publications

(53 reference statements)

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“…1 ). Figure 1b details the motional piezovoltage V d measured at different actuation voltages V a , showing a resonance peak which corresponds to the fundamental flexural mode 39 , 40 with frequency ω M /2 π = 1.716 MHz and quality factor Q = 5 × 10 4 . With increasing V a , the mechanical amplitude is deformed into a sawtooth-shape reflecting the emergence of a nonlinearity in the underlying harmonic potential 41 .…”

Section: Resultsmentioning

confidence: 99%

Dynamical coupling between a nuclear spin ensemble and electromechanical phonons

et al. 2018

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Dynamical coupling with high-quality factor resonators is essential in a wide variety of hybrid quantum systems such as circuit quantum electrodynamics and opto/electromechanical systems. Nuclear spins in solids have a long relaxation time and thus have the potential to be implemented into quantum memories and sensors. However, state manipulation of nuclear spins requires high-magnetic fields, which is incompatible with state-of-the-art quantum hybrid systems based on superconducting microwave resonators. Here we investigate an electromechanical resonator whose electrically tunable phonon state imparts a dynamically oscillating strain field to the nuclear spin ensemble located within it. As a consequence of the dynamical strain, we observe both nuclear magnetic resonance (NMR) frequency shifts and NMR sidebands generated by the electromechanical phonons. This prototype system potentially opens up quantum state engineering for nuclear spins, such as coherent coupling between sound and nuclei, and mechanical cooling of solid-state nuclei.

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Section: Resultsmentioning

confidence: 99%

Dynamical coupling between a nuclear spin ensemble and electromechanical phonons

et al. 2018

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“…However, the key to achieving these objectives is the dual requirement of low phonon numbers and the ability to resolve them with low back-action [38]. Recent work has shown that these pre-requisites are now within reach to this architecture with phonon numbers below 1000 and a resolution of 70 phonons being observed [39].…”

Section: Discussion and Summarymentioning

confidence: 99%

A correlated electromechanical system

et al. 2017

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A correlation with phonons sustained by a pair of electromechanical resonators that differ both in size and frequency is demonstrated. In spite of the electromechanical resonators being spatially distinct, they can still be strongly dynamically coupled via a classical analogue of the beam splitter interaction with a cooperativity exceeding five, and parametric down-conversion which results in both resonators self-oscillating. This latter regime yields a classical variant of a two-mode squeezed state which is identified as perfectly correlated phase-locked vibrations between the two resonators. The creation of a correlation between two separate mechanical resonators suggests that extending this interaction to vacuum phonon states could enable a macroscopic two-mode squeezed state to be generated. Conversely, the ability to resolve the correlated state via the self-oscillations could be harnessed to build a new class of detector where an external stimulus neutralises the phase-locked vibrations.

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“…Stress-induced performance change of the CdS nanocrystals has been reported in [20]. Semiconductor QDs have been embedded in electromechanical resonators in reference [21]. It was stated that the wavelength tuneability becomes a fundamental requirement for a number of new applications [22], which promotes the research and development in integrating QDs with electromechanical devices.…”

Section: Introductionmentioning

confidence: 99%

Piezotronic effect on the luminescence of quantum dots for micro/nano-newton force measurement

Zhang

Nie

2018

Nano Res.

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The luminescence of semiconductor quantum dot (QD) can be adjusted by piezotronic effect. An external mechanical force applied on the QD generates piezoelectric potential, which alters the luminescence of the QD. A small mechanical force may induce significant change on the emission spectrum. For InN QD case, it is demonstrated that the un-forced emission wavelength is more than doubled by a 1 μN force. The strategy of using piezotronic effect to tune the colour of the emission leads to promising noncontact force measurement applications in biological, medical sensors and force sensitive displays. More piezoelectric semiconductor materials have been investigated in terms of the tuneability of the emission wavelength in the presence of an external applied force. It is found that CdS and CdSe demonstrate much higher tuneability δλ/δF, which will lead to micro/nano-newton force measurement applications.

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Gate-controlled electromechanical backaction induced by a quantum dot

Cited by 52 publications

References 35 publications

Dynamical coupling between a nuclear spin ensemble and electromechanical phonons

Dynamical coupling between a nuclear spin ensemble and electromechanical phonons

A correlated electromechanical system

Piezotronic effect on the luminescence of quantum dots for micro/nano-newton force measurement

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