Abstract
We experimentally investigate spin-polarized electron transport between two ferromagnetic contacts, placed at the edge of a two-dimensional electron system with band inversion. The system is realized in a narrow (8 nm) HgTe quantum well, the ferromagnetic side contacts are formed from a premagnetized permalloy film. In zero magnetic field, we find a significant edge current contribution to the transport between two ferromagnetic contacts. We experimentally demonstrate that this transport is sensitive to the mutual orientation of the magnetization directions of two 200 µm-spaced ferromagnetic leads. This is a direct experimental evidence on the spin-coherent edge transport over the macroscopic distances. Thus, the spin is extremely robust at the edge of a two-dimensional electron system with band inversion, confirming the helical spin-resolved nature of edge currents.
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M. König, S. Wiedmann, C. Brne, A. Roth, H. Buhmann, L. W. Molenkamp, X.-L. Qi, and S.-C. Zhang, Science 318, 766 (2007).
G. M. Gusev, Z. D. Kvon, O. A. Shegai, N. N. Mikhailov, S. A. Dvoretsky, and J. C. Porta, Phys. Rev. B 84, 121302(R) (2011).
M. Büttiker, Phys. Rev. B 38, 9375 (1988).
A. Roth, C. Brüne, H. Buhmann, L. W. Molenkamp, J. Maciejko, X.-L. Qi, and S.-C. Zhang, Science 325, 294 (2009).
G. M. Gusev, E. B. Olshanetsky, Z. D. Kvon, O. E. Raichev, N. N. Mikhailov, and S. A. Dvoretsky, Phys. Rev. B 88, 195305 (2013).
B. A. Volkov and O. A. Pankratov, JETP Lett. 42, 178 (1985).
S. Murakami, N. Nagaosa, and S.-C. Zhang, Phys. Rev. Lett. 93, 156804 (2004).
C. L. Kane and E. J. Mele, Phys. Rev. Lett. 95, 146802 (2005).
B. A. Bernevig and S.-C. Zhang, Phys. Rev. Lett. 96, 106802 (2006).
K. C. Nowack, E. M. Spanton, M. Baenninger, M. König, J. R. Kirtley, B. Kalisky, Ch. Ames, Ph. Leubner, Ch. Brüne, H. Buhmann, L. W. Molenkamp, D. Goldhaber-Gordon, and K. A. Moler, Nature Mater. 12, 787 (2013).
C. Brüne, A. Roth, H. Buhmann, E. M. Hankiewicz, L. W. Molenkamp, J. Maciejko, X.-L. Qi, and S.-C. Zhang, Nature Phys. 8, 485 (2012).
I. Adagideli, G. E. W. Bauer, and B. I. Halperin, Phys. Rev. Lett. 97, 256601 (2006).
X.-L. Qi, T. L. Hughes, and Sh.-Ch. Zhang, Nature Phys. 4, 273 (2008).
A. Kononov, S. V. Egorov, G. Biasiol, L. Sorba, and E. V. Deviatov, Phys. Rev. B 89, 075312 (2014).
Z. D. Kvon, E. B. Olshanetsky, D. A. Kozlov, N. N. Mikhailov, and S. A. Dvoretsky, JETP Lett. 87, 502 (2008).
E. B. Olshanetsky, Z. D. Kvon, N. N. Mikhailov, E. G. Novik, I. O. Parm, and S. A. Dvoretsky, Solid State Commun. 152, 265 (2012).
A. M. Lunde and G. Platero, Phys. Rev. B 86, 035112 (2012).
G. M. Gusev, Z. D. Kvon, E. B. Olshanetsky, A. D. Levin, Y. Krupko, J. C. Portal, N. N. Mikhailov, and S. A. Dvoretsky, Phys. Rev. B 89, 125305 (2014).
D. B. Chklovskii, B. I. Shklovskii, and L. I. Glazman, Phys. Rev. B 46, 4026 (1992).
E. Ahlswede, J. Weis, K.v. Klitzing, and K. Eberl, Physica E 12, 165 (2002).
R. J. Haug, Semicond. Sci. Technol. 8, 131 (1993).
O. E. Raichev, Phys. Rev. B 85, 045310 (2012).
T. Yokoyama, Y. Tanaka, and N. Nagaosa, Phys. Rev. Lett. 102, 166801 (2009).
M. Guigou, P. Rechter, J. Cayssol, and B. Trauzettel, Phys. Rev. B 84, 094534 (2011).
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Kononov, A., Egorov, S.V., Kvon, Z.D. et al. Evidence on the macroscopic length scale spin coherence for the edge currents in a narrow HgTe quantum well. Jetp Lett. 101, 814–819 (2015). https://doi.org/10.1134/S0021364015120115
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DOI: https://doi.org/10.1134/S0021364015120115