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A boron impurity in silicon binding an extra hole is known to have only onebound state at an energy of just below 2 meV. The nature of the Si:B^+ groundstate is however not well established. We qualitatively analyze the behavior ina magnetic field of isolated acceptors in a tetrahedral lattice binding twoholes using group theory. Applying these results, we analyze recentmeasurements and conclude that the ground state of B^+ is most compatible witha non-degenerate Gamma_1 state.Comment: 7 pages, 2 EPS figures. Submitte

physical review. b, condensed matter and materials physics

Group-theoretical analysis of double acceptors in a magnetic field: Identification of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Si</mml:mi><mml:mo>:</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>ground state

Group-theoretical analysis of double acceptors in a magnetic field: Identification of theSi:B+ground state