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The low-temperature (∼5 K) phonon-assisted relaxation of the 2p 0 state of phosphorus donors in isotopically pure, monocrystalline 28 Si has been studied in the time domain using a pump-probe technique. The lifetime of the 2p 0 state in 28 Si:P is found to be 235 ps, which is 16% larger than the lifetime of a reference Si:P sample with a natural isotope(More)
Laboratory spectroscopy of atomic hydrogen in a magnetic flux density of 10(5) T (1 gigagauss), the maximum observed on high-field magnetic white dwarfs, is impossible because practically available fields are about a thousand times less. In this regime, the cyclotron and binding energies become equal. Here we demonstrate Lyman series spectra for phosphorus(More)
We report the optical measurement of the spin dynamics at elevated temperatures and in zero magnetic field for two types of degenerately doped n-InSb quantum wells (QWs), one asymmetric (sample A) and one symmetric (sample B) with regards to the electrostatic potential across the QW. Making use of three directly determined experimental parameters: the spin(More)
Electron spin relaxation times have been measured in InSb and InAs epilayers in a moderate ͑Ͻ4 T͒ external magnetic field. A strong and opposite field dependence of the spin lifetime was observed for longitudinal ͑Faraday͒ and transverse ͑Voigt͒ configuration. In the Faraday configuration the spin lifetime increases because the D'yakonov–Perel' dephasing(More)
Articles you may be interested in Nonlinear photoresponse of field effect transistors terahertz detectors at high irradiation intensities Rational design of high-responsivity detectors of terahertz radiation based on distributed self-mixing in silicon field-effect transistors Increasing the operating temperature of boron doped silicon terahertz(More)
Shallow donors in silicon are favorable candidates for the implementation of solid-state quantum computer architectures because of the promising combination of atomiclike coherence properties and scalability from the semiconductor manufacturing industry. Quantum processing schemes require (among other things) controlled information transfer for readout.(More)
We measure transverse magnetically focused photocurrent signals in an InSb/InAlSb quantum well device. Using optical spin orientation by modulated circularly polarized light an electron spin dependent signal is observed due to the spin-orbit interaction. Simulations of the focusing signal are performed using a classical billiard ball model which includes(More)
We have used two-color time-resolved spectroscopy to measure the relaxation of electron spin polarizations in a bulk semiconductor. The circularly polarized pump beam induces a polarization either by direct excitation from the valence band, or by free-carrier (Drude) absorption when tuned to an energy below the band gap. We find that the spin relaxation(More)