Donor to Acceptor Electron Transfer in Germanium at Low Temperatures

Sanada, T.; Matsushita, Kiyoshi; Ohyama, T.; Otsuka, Eizo

doi:10.1143/jpsj.45.501

Cited by 11 publications

(2 citation statements)

References 4 publications

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“…Dashed black bars indicate published cross section data, presumably at zero field. a. electron capture (T = 3.1K) on Sb + in Ge [16,17], b. electron capture (T = 1.5K) on neutral acceptors [18] 10 Predicted cross sections (due to acoustic phonon emission) for electrons on dipoles. The dipole cross section has a dependence on the dipole concentration.…”

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“…Dashed black bars indicate published cross section data, presumably at zero field. a. hole capture (T = 1.6K) on B − in Ge [16], b. hole capture (T = 2.2K) on Al − in Ge [16], c. hole capture (T = 1.7K) by neutral donors [18] 2 The case for only diffusion and generation terms. a. electron and hole free carrier distributions in the steady state b. the potential energy terms due to the free carrier distributions c. the potential energy terms due to the space charge integrated onto bound bulk states .…”

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Carrier Transport and Related Effects in Detectors of the Cryogenic Dark Matter Search

Sundqvist

2012

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The Cryogenic Dark Matter Search (CDMS) is searching for weakly-interacting massive particles (WIMPS), which could explain the dark matter problem in cosmology and particle physics.By simultaneously measuring signals from deposited charge and the energy in nonequilibrium phonons created by particle interactions in intrinsic germanium crystals at a temperature of 40 mK, a signature response for each event is produced. This response, combined with phonon pulse-shape information, allows CDMS to actively discriminate candidate WIMP interactions with nuclei from electromagnetic radioactive background which interacts with electrons.The challenges associated with these techniques are unique. Carrier scattering is dominated by the spontaneous emission of Luke-Neganov phonons due to zeropoint fluctuations of the lattice ions. Drift fields are maintained at only a few V /cm, else these emitted phonons would dominate the phonons of the original interaction. The dominant systematic issues with CDMS detectors are due to the effects of space charge accumulation. It has been an open question how space charge accrues, and by which of several potential recombination and ionization processes.In this work, we have simulated the transport of electrons and holes in germanium under CDMS conditions. We have implemented both a traditional Monte Carlo technique based on carrier energy, followed later by a novel Monte Carlo algorithm with scattering rates defined and sampled by vector momentum. This vector-based method provides for a full anisotropic simulation of carrier transport including freeflight acceleration with an anisotropic mass, and anisotropic scattering rates.With knowledge of steady state carrier dynamics as a function of applied field, the results of our Monte Carlo simulations allow us to make a wide variety of predictions for energy dependent processes for both electrons and holes.

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Carrier Transport and Related Effects in Detectors of the Cryogenic Dark Matter Search

Sundqvist

2012

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Internal Stark Effect on Impurity States in Germanium

Ohyama

1980

Physica Status Solidi (b)

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Effects of the Coulomb field by ionized impurities on the acceptor as well as on the donor states in germanium are studied by low-temperature magneto-absorption measurements. The broadening of the representative acceptor transition is roughly proportional t o the two-third power of the ionized impurity concentration. It is attributed to the Stark effect by ionized impurities which removes the degeneracy of the excited states. The effect is smaller for the donor statein which the level splitting b y magnetic field is larger.Die Wirkung des Coulomb-Feldes von geladenen Zentren sowohl auf den Akzeptor als auch auf den Donator wird durch die magneto-optische Absorption bei tiefen Temperaturen untersucht. Die Verbreiterung einer typischen Ubergangslinie des Akzeptors ist proportional zur Zwei-drittel-Potenz der Konzentration von geladenen Zentren. Sie wird dem Starkeffekt von ionisierten Fremdatomen zugeordnet, der die Entartung der angeregten Zustande aufhebt. Der Effekt ist kleiner beim Donator, in welchem die Niveauaufspaltung durch das Magnetfeld gewohnlich grol3er ist.

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Far-Infrared cyclotron resonance of hot carriers in InSb

Otsuka

Application of High Magnetic Fields in Semiconductor Physics

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Donor to Acceptor Electron Transfer in Germanium at Low Temperatures

Cited by 11 publications

References 4 publications

Carrier Transport and Related Effects in Detectors of the Cryogenic Dark Matter Search

Carrier Transport and Related Effects in Detectors of the Cryogenic Dark Matter Search

Internal Stark Effect on Impurity States in Germanium

Far-Infrared cyclotron resonance of hot carriers in InSb

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