Dynamical coupling between a nuclear spin ensemble and electromechanical phonons

Abstract

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.

Novel Dynamical Magnetoelectric Effects in Multiferroic BiFeO3

“…Furthermore, a phenomenon analogous to our proposed "electro-acoustic-magnons" has just been reported in Ref. [50], that is a dynamical coupling between nuclear spins and electromechanical phonons. Such phenomenon consists of applying an ac electric field at the natural frequency of a resonator, which leads to an electrically tunable phonon that imparts diagonal and shear strains oscillating with time and which then dynamically couple with spins of nuclei (via a quadruple interaction between strains and spins there).…”

“…Such phenomenon consists of applying an ac electric field at the natural frequency of a resonator, which leads to an electrically tunable phonon that imparts diagonal and shear strains oscillating with time and which then dynamically couple with spins of nuclei (via a quadruple interaction between strains and spins there). This resulting dynamical coupling between spins and electromechanical phonons was indicated to open up quantum state engineering, such as coherent coupling between sound and nuclei and mechanical cooling of solid-state nuclei [50]. Such interesting possibilities therefore hint that our presently discovered "electro-acoustic-magnons" may lead to novel and important devices.…”

Resistively-detected NMR lineshapes in a local filling $ν< 1$ quantum Hall breakdown

“…The observed dispersive lineshapes have been reported in a 2D system [12,13,14,15,16,17,18,19] and are interpreted due to the formation of spin unpolarized puddles in the sea of spin-polarized background [17]. Previous RDNMR studies are overwhelmingly reported in a single quantum point contact device and in a strong tunneling regime between the two edge channels at the lowest Landau level [20,21,9,22,23]. In attempt to comprehensively study local hyperfine-mediated transport in the lowest Landau level, in this study, we investigate RDNMR spectra in a wide range of local filling factor 0 < ν qpc < 1, encompassing strong to weak tunneling regime between the inner and outer edge channel at the lowest Landau level.…”

Analysis of Magnetoacoustic Quadrupole Resonance and Application to Probe Quadrupole Degrees of Freedom in Quantum Magnets

“…The suggested photonassisted magnetoacoustic resonance can also be applied to optical control in quantum spin devices. [11][12][13][14] In this paper, we extend our previous study of magnetoacoustic resonance 11) to various doublet states with quadrupole couplings using the Floquet theory originally formulated by Shirley for a twolevel system coupled to a periodically time-dependent oscillating field. 15) This theory covers the strong coupling region as well as the weak coupling limit, and is useful for describing the fundamental properties of magnetoacoustic quadrupole resonance.…”