Terahertz Spin Precession and Coherent Transfer of Angular Momenta in Magnetic Quantum Wells

Crooker, S. A.; Baumberg, Jeremy J.; Flack, F.; Samarth, N.; Awschalom, D. D.

doi:10.1103/physrevlett.77.2814

Cited by 201 publications

(156 citation statements)

References 15 publications

Supporting

Mentioning

150

Contrasting

Order By: Relevance

“…We have developed a setup at FELIX to utilize both the polarization pump-probe method 1,12,13 and the Faraday rotation method 9,11,13 in the 5-10 m region in order to examine the spin relaxation times of bulk epilayers of longwavelength Hg 1Ϫx Cd x Te and InSb as a function of temperature, doping, and mobility. The principal modification we have to make is that we are using FELIX to generate the long-wavelength ͑ps͒ pump-probe radiation, with corresponding long-wavelength plane and circular polarizers.…”

Section: Experimental Methodsmentioning

confidence: 99%

Electron spin lifetimes in long-wavelengthHg1−xCdxTeand InSb at elevated tem

et al. 2003

View full text Add to dashboard Cite

We have made direct pump-probe measurements of spin lifetimes in long-wavelength narrow-gap semiconductors at wavelengths between 4 and 10 m and from 4 to 300 K. In particular, we measure remarkably long spin lifetimes s ϳ300 ps even at 300 K for epilayers of degenerate n-type InSb. In this material the mobility is approximately constant between 77 and 300 K, and we find that s is approximately constant in this temperature range. In order to determine the dominant spin relaxation mechanism we have investigated the temperature dependence of s in nondegenerate lightly n-type Hg 0.78 Cd 0.22 Te of approximately the same bandgap as InSb and find that s varies from 356 ps at 150 K to 24 ps at 300 K. In this material lattice scattering dominates giving a T Ϫ3/2 dependence for the mobility, and we expect a strong temperature dependence of s . There are two main models that have been invoked for describing spin relaxation in narrow-gap semiconductors: the Elliott-Yafet ͑EY͒ model which gives a T Ϫ7/2 dependence of s in this limit and the D'yakonov-Perel model which gives a T Ϫ3/2 dependence. Our results, both in magnitude and temperature dependence of s , imply that the EY model dominates in these materials.

show abstract

Section: Experimental Methodsmentioning

confidence: 99%

Electron spin lifetimes in long-wavelengthHg1−xCdxTeand InSb at elevated tem

et al. 2003

View full text Add to dashboard Cite

show abstract

“…Figure 3 shows that an in-plane magnetic Another way to estimate the splitting ∆E ex follows from timeresolved pump-probe Kerr rotation experiments. Time-resolved pump-probe Kerr rotation traces the electron and hole-spin precession and relaxation 27,28 . Typical Kerr rotation signals for different transverse magnetic fields, applied to the '10 nm' sample at T = 8 K, are shown in Fig.…”

Section: Effect Of the Ferromagnet On Optical Orientation Of Qw Electmentioning

confidence: 99%

Dynamic spin polarization by orientation-dependent separation in a ferromagnet–semiconductor hybrid

et al. 2012

View full text Add to dashboard Cite

Integration of magnetism into semiconductor electronics would facilitate an all-in-one-chip computer. Ferromagnet/bulk semiconductor hybrids have been, so far, mainly considered as key devices to read out the ferromagnetism by means of spin injection. Here we demonstrate that a mn-based ferromagnetic layer acts as an orientation-dependent separator for carrier spins confined in a semiconductor quantum well that is set apart from the ferromagnet by a barrier only a few nanometers thick. By this spin-separation effect, a non-equilibrium electronspin polarization is accumulated in the quantum well due to spin-dependent electron transfer to the ferromagnet. The significant advance of this hybrid design is that the excellent optical properties of the quantum well are maintained. This opens up the possibility of optical readout of the ferromagnet's magnetization and control of the non-equilibrium spin polarization in non-magnetic quantum wells.

show abstract

“…Indeed, η 2 has obviously a strong magnetic q2/VersionFinale/FIG2.wmf ? It is already known that Mn spin fluctuations damp the homogeneous mode 14 . But, in our samples, the typical Mn average distanced ∼ 0.4nm is far smaller than the minimum magnetization wavelength probed in the Raman experiment (qd ¿ 1).…”

mentioning

confidence: 99%