Resonant optical spectroscopy and coherent control of Cr4+ spin ensembles in SiC and GaN

Abstract

Spins bound to point defects are increasingly viewed as an important resource for solid-state implementations of quantum information technologies. In particular, there is a growing interest in the identification of new classes of defect spin that can be controlled optically. Here we demonstrate ensemble optical spin polarization and optically detected magnetic resonance (ODMR) of the S = 1 electronic ground state of chromium (Cr4+) impurities in silicon carbide (SiC) and gallium nitride (GaN). Spin polarization is made possible by the narrow optical linewidths of these ensembles (< 8.5 GHz), which are similar in magnitude to the ground state zero-field spin splitting energies of the ions at liquid helium temperatures. We therefore are able to optically resolve individual spin sublevels within the ensembles at low magnetic fields using resonant excitation from a cavity-stabilized, narrow-linewidth laser. Additionally, these near-infrared emitters possess exceptionally weak phonon sidebands, ensuring that > 73% of the overall optical emission is contained with the defects zero-phonon lines. These characteristics make this semiconductor-based, transition metal impurity system a promising target for further study in the ongoing effort to integrate optically active quantum states within common optoelectronic materials.

arXiv comment13 pages, 4 figures

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• Purcell enhancement of a single silicon carbide color center with coherent spin control
• Quantum properties of dichroic silicon vacancies in silicon carbide
• Ultralong Dephasing Times in Solid-State Spin Ensembles via Quantum Control
• Coherent Manipulation with Resonant Excitation and Single Emitter Creation of Nitrogen Vacancy Centers in 4H Silicon Carbide
• Optical Properties of Vanadium in 4H Silicon Carbide for Quantum Technology
• Identification and tunable optical coherent control of transition-metal spins in silicon carbide
• Novel color center platforms enabling fundamental scientific discovery
• Local vibrational modes of Si vacancy spin qubits in SiC
• Quantum Information Processing With Integrated Silicon Carbide Photonics
• Quantum sensing of magnetic fields with molecular color centers
• Quantum photonics in triangular-cross-section nanodevices in silicon carbide
• Spin-relaxation times exceeding seconds for color centers with strong spin-orbit coupling in SiC
• Spin thermometry and spin relaxation of optically detected Cr3+ ions in ruby Al2O3
• Electron-nuclear coherent spin oscillations probed by spin dependent recombination
• A QM/MM equation-of-motion coupled-cluster approach for predicting semiconductor color-center structure and emission frequencies
• Quantum Defects in 2D Transition Metal Dichalcogenides for Terahertz Technologies
• Transition metal ion ensembles in crystals as solid-state coherent spin-photon interfaces: The case of nickel in magnesium oxide
• Room-temperature coherent control of implanted defect spins in silicon carbide
• Spin-spin interactions in solids from mixed all-electron and pseudopotential calculations $-$ a path to screening materials for spin qubits