K. L. Litvinenko

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We report Larmor precession in bulk InSb observed in the time domain from 77 to 300 K. The optically oriented polarization precesses coherently even at 300 K. The inferred Zeeman spin splitting is strongly nonparabolic, and the electron g factor ͑g * ͒ is in good agreement with k · p theory ͑provided we take only the dilational contribution to the change in(More)
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 have used time resolved spectroscopy to measure the relaxation of spin polarization in InSb/AlInSb quantum wells (QWs) as a function of temperature and mobility. The results are consistent with the D'yakonov–Perel (DP) mechanism for high mobility samples over the temperature range from 50 to 300 K. For low mobility samples at high temperature the(More)
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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)
Exciton-exciton recombination in isolated semiconducting single-walled carbon nanotubes was studied using femtosecond transient absorption. Under sufficient excitation to saturate the optical absorption, we observed an abrupt transition between reaction- and diffusion-limited kinetics, arising from reactions between incoherent localized excitons with a(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)
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)