2009/12/31 by T. Sekiguchi, M. Steger, Michael F. Steger +6 · 48 citations
Materials Science · Physics and Astronomy · #Atomic physics #Condensed matter physics #Excitation #Exciton #Ground state #Hyperfine structure #Hyperpolarization (physics) #Magnetic field #Nuclear magnetic resonance #Nuclear magnetic resonance spectroscopy #Optoelectronics #Phase-change materials and chalcogenides #Photoluminescence #Physics #Quantum and electron transport phenomena #Semiconductor materials and interfaces #Spin (aerodynamics) #quant-ph
paper · pdf · doi:10.1103/physrevlett.104.137402
published in Physical Review Letters 104(13), 137402 (American Physical Society) · 4 pages, 3 figures, 1 table
openalex publication_date 2010/04/02 · arxiv created 2010/06/01 · arxiv updated 2010/06/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
As the deepest group-V donor in Si, Bi has by far the largest hyperfine interaction and also a large I = 9/2 nuclear spin. At zero field this splits the donor ground state into states having total spin 5 and 4, which are fully resolved in the photoluminescence spectrum of Bi donor bound excitons. Under a magnetic field, the 60 expected allowed transitions cannot be individually resolved, but the effects of the nuclear spin distribution, -9/2 < or = I(z) < or = 9/2, are clearly observed. A strong hyperpolarization of the nuclear spin towards I(z) = -9/2 is observed to result from the nonresonant optical excitation. This is very similar to the recently reported optical hyperpolarization of P donors observed by EPR at higher magnetic fields. We introduce a new model to explain this effect, and predict that it may be very fast.