Nuclear spin polarization in silicon carbide at room temperature in the Earth's magnetic field

Abstract

Coupled electron-nuclear spins represent a promising quantum system, where the optically induced electron spin polarization can be dynamically transferred to nuclear spins via the hyperfine interaction. Most experiments on dynamic nuclear polarization (DNP) are performed at cryogenic temperatures and/or in moderate external magnetic fields, the latter approach being very sensitive to the magnetic field orientation. Here, we demonstrate that the ${}^{29}$Si nuclear spins in SiC can be efficiently polarized at room temperature even in the Earth's magnetic field. We exploit the asymmetric splitting of the optically detected magnetic resonance (ODMR) lines inherent to half-integer $S=3/2$ electron spins, such that the certain transitions involving ${}^{29}$Si nuclei can be clearly separated and selectively addressed using radiofrequency (RF) fields. As a model system, we use the V3 silicon vacancy in 6H-SiC, which has the zero-filed splitting parameter comparable with the hyperfine interaction constant. Our theoretical model considers DNP under optical excitation in combination with RF driving and agrees very well with the experimental data. In the case of high-fidelity electron spin polarization, the proposed DNP protocol leads to ultra-deep optical cooling of nuclear spins with an effective temperature of about 50 nK. These results provide a straightforward approach for controlling the nuclear spin under ambient conditions, representing an important step toward realizing nuclear hyperpolarization for magnetic resonance imaging and long nuclear spin memory for quantum logic gates.

arXiv comment9 pages, 4 figures

References in corpus (30)

• Dynamic polarization of single nuclear spins by optical pumping of NV color centers in diamond at room temperature
• High-fidelity spin and optical control of single silicon vacancy centres in silicon carbide
• Entanglement and control of single quantum memories in isotopically engineered silicon carbide
• Nanofabricated and integrated colour centres in silicon carbide with high-coherence spin-optical properties
• Resonant addressing and manipulation of silicon vacancy qubits in silicon carbide
• Locking of electron spin coherence over fifty milliseconds in natural silicon carbide
• Pulsed polarisation for robust DNP
• Optical polarization of nuclear spins in silicon carbide
• Orientation independent room-temperature optical 13C hyperpolarization in powdered diamond
• Optical thermometry based on level anticrossing in silicon carbide
• Excitation and coherent control of spin qudit modes with sub-MHz spectral resolution
• Local and bulk 13C hyperpolarization in NV-centered diamonds at variable fields and orientations
• Electron Spin Decoherence in Silicon Carbide Nuclear Spin Bath
• High precision vector magnetometry with uniaxial quantum centers in silicon carbide
• Spin and optical properties of silicon vacancies in silicon carbide (a review)
• Theoretical model of the dynamic spin polarization of nuclei coupled to paramagnetic point defects in diamond and silicon carbide
• Spectrally reconfigurable quantum emitters enabled by optimized fast modulation
• Influence of irradiation on defect spin coherence in silicon carbide
• Optical hyperpolarization of 13C nuclear spins in nanodiamond ensembles
• Room-temperature near-infrared silicon carbide nanocrystalline emitters based on optically aligned spin defects
• Quantum metrology with a single spin-$3/2$ defect in silicon carbide
• Local vibrational modes of Si vacancy spin qubits in SiC
• Definitive observation of the dark triplet ground state of charged excitons in high magnetic fields
• Anisotropic Spin-Acoustic Resonance in Silicon Carbide at Room Temperature
• Scalable quantum memory nodes using nuclear spins in Silicon Carbide
• Single-Shot Readout of a Nuclear Spin in Silicon Carbide
• Electron nuclear interactions and electronic structure of spin 3/2 color centers in silicon carbide: A high-field pulse EPR and ENDOR study
• Measuring nuclear spin qubits by qudit-enhanced spectroscopy in Silicon Carbide
• ${}^{13}$C Hyperpolarization with Nitrogen-Vacancy Centers in Micro- and Nanodiamonds for Sensitive Magnetic Resonance Applications
• Multi-photon multi-quantum transitions in the spin-3/2 silicon-vacancy centers of SiC