A phonon laser utilizing quantum-dot spin states

Abstract

We propose a nano-scale realization of a phonon laser utilizing phonon-assisted spin flips in quantum dots to amplify sound. Owing to a long spin relaxation time, the device can be operated in a strong pumping regime, in which the population inversion is close to its maximal value allowed under Fermi statistics. In this regime, the threshold for stimulated emission is unaffected by spontaneous spin flips. Considering a nanowire with quantum dots defined along its length, we show that a further improvement arises from confining the phonons to one dimension, and thus reducing the number of phonon modes available for spontaneous emission. Our work calls for the development of nanowire-based, high-finesse phonon resonators.

5 pages, 2 figures

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• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line
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• Nanomechanical Analog of a Laser: Amplification of Mechanical Oscillations by Stimulated Zeeman Transitions
• Laser-like vibrational instability in rectifying molecular conductors
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• Spin-dependent tunneling into an empty lateral quantum dot

Cited by in corpus (16)

• Toward high-frequency operation of spin lasers
• Spin-Lasers: Spintronics Beyond Magnetoresistance
• Ground-state cooling of a carbon nanomechanical resonator by spin-polarized current
• Phonon amplification in two coupled cavities containing one mechanical resonator
• Phase-Controlled Phonon Laser
• Wurtzite spin lasers
• Dynamical multistability in a quantum-dot laser
• Control of vibrational states by spin-polarized transport in a carbon nanotube resonator
• Phonon mediated spin relaxation in a moving quantum dot: Doppler shift, Cherenkov radiation, and spin relaxation boom
• Lasing and antibunching of optical phonons in semiconductor double quantum dots
• Threshold behavior in spin lasers: Spontaneous emission and nonlinear gain
• Intensity equations for birefringent spin lasers
• Polarization response of spin-lasers under amplitude modulation
• The birefringent spin-laser as a system of coupled harmonic oscillators
• Phonon laser in a cavity magnomechanical system
• Scalable phonon-laser arrays with self-organized synchronization