Abstract
Spin transport and manipulation in semiconductors have been studied intensively with the ultimate goal of realizing spintronic devices. Previous work in GaAs has focused on controlling the carrier density1, crystallographic orientation2 and dimensionality3,4 to limit the electron spin decoherence and allow transport over long distances4,5,6,7. Here, we introduce a new method for the coherent transport of spin-polarized electronic wave packets using dynamic quantum dots (DQDs) created by the piezoelectric field of coherent acoustic phonons8,9,10,11. Photogenerated spin carriers transported by the DQDs in undoped GaAs (001) quantum wells exhibit a spin coherence length exceeding 100 μm, which is attributed to the simultaneous control of the carrier density and the dimensionality12 by the DQDs during transport. In the absence of an applied magnetic field, we observe the precession of the electron spin induced by the internal magnetic field associated with the spin splitting of the conduction band (Dresselhaus term)13. The coherent manipulation of the precession frequency is also achieved by applying an external magnetic field.
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References
Kikkawa, J. M. & Awschalom, D. D. Resonant spin amplification in n-type GaAs. Phys. Rev. Lett. 80, 4313–4316 (1998).
Ohno, Y., Terauchi, R., Adachi, T., Matsukura, F. & Ohno, H. Spin relaxation in GaAs(110) quantum wells. Phys. Rev. Lett. 83, 4196–4199 (1999).
Paillard, M. et al. Spin relaxation quenching in semiconductor quantum dots. Phys. Rev. Lett. 86, 1634–1637 (2001).
Sogawa, T., Ando, H. & Ando, S. Spin-transport dynamics of optically spin-polarized electrons in GaAs quantum wires. Phys. Rev. B 61, 5535–5539 (2000).
Kikkawa, J. M. & Awschalom, D. D. Lateral drag of spin coherence in gallium arsenide. Nature 397, 139–141 (1999).
Kato, Y., Myers, R. C., Gossart, A. C. & Awschalom, D. D. Coherent spin manipulation without magnetic fields in strained semiconductors. Nature 427, 50–53 (2004).
Sogawa, T. et al. Spin transport in quantum wells by surface acoustic waves. Phys. Rev. Lett. 87, 276601 (2001).
Stotz, J. A. H., Hey, R. & Santos, P. V. Acoustically induced dynamic potential dots. Physica E 26, 67–71 (2005).
Alsina, F., Stotz, J. A. H., Hey, R. & Santos, P. V. Acoustically induced potential dots in GaAs quantum wells. Solid State Commun. 129, 453–457 (2004).
Furuta, S., Barnes, C. H. W. & Doran, C. J. L. Single-qubit gates and measurements in the surface acoustic wave quantum computer. Phys. Rev. B 70, 205320 (2004).
Gumbs, G. & Abranyos, Y. Quantum entanglement for acoustic spintronics. Phys. Rev. A 70, 050302(R) (2004).
Chang, C. -H., Mal’shukov, A. G. & Chao, K. A. Spin relaxation dynamics of quasiclassical electrons in ballistic quantum dots with strong spin-orbit coupling. Phys. Rev. B 70, 245309 (2004).
Dresselhaus, G. Spin-orbit coupling effects in zinc blende structures. Phys. Rev. 100, 580–586 (1955).
Rocke, C. et al. Acoustically driven storage of light in a quantum well. Phys. Rev. Lett. 78, 4099–4102 (1997).
Bir, G. L., Aronov, A. G. & Pikus, G. E. Spin relaxation of electrons due to scattering by holes. Sov. Phys. JETP 42, 705–712 (1975).
D’yakonov, M. I. & Perel’, V. I. Spin relaxation of conduction electrons in noncentrosymmetric semiconductors. Sov. Phys. Solid State 13, 3023–3026 (1972).
Bychkov, Yu. A. & Rashba, E. I. Properties of a 2D electron gas with lifted spectral degeneracy. JETP Lett. 39, 78–81 (1984).
Dzhioev, R. I. et al. Low-temperature spin relaxation in n-type GaAs. Phys. Rev. B 66, 245204 (2002).
Keldysh, L. V. Effect of ultrasonics of the electron spectrum of crystals. Sov. Phys. Solid State 4, 1658–1659 (1963).
Govorov, A. O., Kalameitsev, A. V., Kovalev, V. M., Kutschera, H. -J. & Wixforth, A. Self-induced acoustic transparency in semiconductor quantum films. Phys. Rev. Lett. 87, 226803 (2001).
Zumbühl, D. M., Miller, J. B., Marcus, C. M., Campman, K. & Gossard, A. C. Spin-orbit coupling, antilocalization, and parallel magnetic fields in quantum dots. Phys. Rev. Lett. 89, 276803 (2002).
Eppenga, R. & Schuurmans, M. F. H. Effect of bulk inversion asymmetry on [001], [110], and [111] GaAs/AlAs quantum wells. Phys. Rev. B 37, 10923–10926 (1988).
Oestreich, M. et al. Temperature and density dependence of the electron Lande g factor in semiconductors. Phys. Rev. B 53, 7911–7916 (1996).
Acknowledgements
We thank H. T. Grahn and G. S. Solomon for a critical reading of the manuscript and W. Seidel, S. Krauß and M. Höricke for technical support regarding sample fabrication. We would also like to thank the Bundesministerium für Bildung und Forschung for financial support. J.S. is personally grateful to the Alexander von Humboldt Foundation for financial support.
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Stotz, J., Hey, R., Santos, P. et al. Coherent spin transport through dynamic quantum dots. Nature Mater 4, 585–588 (2005). https://doi.org/10.1038/nmat1430
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DOI: https://doi.org/10.1038/nmat1430
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