Generation of spin-polarized currents via cross-relaxation with dynamically pumped paramagnetic impurities

Journal Article · Mon Jul 14 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4890096· OSTI ID:22311355

Meriles, Carlos A. ^[1]; Doherty, Marcus W. ^[2]

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1. Department of Physics, CUNY-City College of New York, New York, New York 10031 (United States)
2. Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200 (Australia)

Key to future spintronics and spin-based information processing technologies is the generation, manipulation, and detection of spin polarization in a solid state platform. Here, we theoretically explore an alternative route to spin injection via the use of dynamically polarized nitrogen-vacancy (NV) centers in diamond. We focus on the geometry where carriers and NV centers are confined to proximate, parallel layers and use a “trap-and-release” model to calculate the spin cross-relaxation probabilities between the charge carriers and neighboring NV centers. We identify near-unity regimes of carrier polarization depending on the NV spin state, applied magnetic field, and carrier g-factor. In particular, we find that unlike holes, electron spins are distinctively robust against spin-lattice relaxation by other, unpolarized paramagnetic centers. Further, the polarization process is only weakly dependent on the carrier hopping dynamics, which makes this approach potentially applicable over a broad range of temperatures.

• OSTI ID: 22311355
• Journal Information: Applied Physics Letters, Vol. 105, Issue 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARRIERS
CHARGE CARRIERS
COMPUTERIZED SIMULATION
CURRENTS
DETECTION
DIAMONDS
IMPURITIES
INJECTION
LANDE FACTOR
LAYERS
MAGNETIC FIELDS
NITROGEN COMPLEXES
PARAMAGNETISM
POLARIZATION
PROBABILITY
SOLIDS
SPIN ORIENTATION
SPIN-LATTICE RELAXATION
TRAPS
VACANCIES