39 research outputs found
Reply to: āOn the Understanding of Current-induced Spin Polarization of Three-dimensional Topological Insulatorsā
Electrical Detection of Current Generated Spin in Topological Insulator Surface States: Role of Interface Resistance
Current generated spin polarization in topological insulator (TI) surface states due to spin-momentum locking has been detected recently using ferromagnet/tunnel barrier contacts, where the projection of the TI spin onto the magnetization of the ferromagnet is measured as a voltage. However, opposing signs of the spin voltage have been reported, which had been tentatively attributed to the coexistence of trivial two-dimensional electron gas states on the TI surface which may exhibit opposite currentinduced polarization than that of the TI Dirac surface states. Models based on electrochemical potential have been presented to determine the sign of the spin voltage expected for the TI surface states. However, these models neglect critical experimental parameters which also afect the sign measured. Here we present a Mott two-spin current resistor model which takes into account these parameters such as spin-dependent interface resistances, and show that such inclusion can lead to a crossing of the voltage potential profles for the spin-up and spin-down electrons within the channel, which can lead to measured spin voltages of either sign. These fndings ofer a resolution of the ongoing controversy regarding opposite signs of spin signal reported in the literature, and highlight the importance of including realistic experimental parameters in the model
Analysis of the Transport Process Providing Spin Injection through an Fe/AlGaAs Schottky Barrier
Electron spin polarizations of 32% are obtained in a GaAs quantum well via
electrical injection through a reverse-biased Fe/AlGaAs Schottky contact. An
analysis of the transport data using the Rowell criteria demonstrates that
single step tunneling is the dominant transport mechanism. The current-voltage
data show a clear zero-bias anomaly and phonon signatures corresponding to the
GaAs-like and AlAs-like longitudinal-optical phonon modes of the AlGaAs
barrier, providing further evidence for tunneling. These results provide
experimental confirmation of several theoretical analyses indicating that
tunneling enables significant spin injection from a metal into a semiconductor.Comment: 4 pages, 4 figures, submitted to AP
Electrical Spin Pumping of Quantum Dots at Room Temperature
We report electrical control of the spin polarization of InAs/GaAs
self-assembled quantum dots (QDs) at room temperature. This is achieved by
electrical injection of spin-polarized electrons from an Fe Schottky contact.
The circular polarization of the QD electroluminescence shows that a 5%
electron spin polarization is obtained in the InAs QDs at 300 K, which is
remarkably insensitive to temperature. This is attributed to suppression of the
spin relaxation mechanisms in the QDs due to reduced dimensionality. These
results demonstrate that practical regimes of spin-based operation are clearly
attainable in solid state semiconductor devices.Comment: 4 figures, accepted by Appl. Phys. Let
Heteroepitaxial growth of ferromagnetic MnSb(0001) films on Ge/Si(111) virtual substrates
Molecular beam epitaxial growth of ferromagnetic MnSb(0001) has been achieved on high quality, fully relaxed Ge(111)/Si(111) virtual substrates grown by reduced pressure chemical vapor deposition. The epilayers were characterized using reflection high energy electron diffraction, synchrotron hard X-ray diffraction, X-ray photoemission spectroscopy, and magnetometry. The surface reconstructions, magnetic properties, crystalline quality, and strain relaxation behavior of the MnSb films are similar to those of MnSb grown on GaAs(111). In contrast to GaAs substrates, segregation of substrate atoms through the MnSb film does not occur, and alternative polymorphs of MnSb are absent