Strong coupling between a permalloy ferromagnetic contact and helical edge channel in a narrow HgTe quantum well

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776116130045· OSTI ID:22617128

Kononov, A.; Egorov, S. V. ^[1]; Kvon, Z. D.; Mikhailov, N. N.; Dvoretsky, S. A. ^[2]

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1. Russian Academy Sciences, Institute of Solid State Physics (Russian Federation)
2. Institute of Semiconductor Physics (Russian Federation)

We experimentally investigate spin-polarized electron transport between a permalloy ferromagnet and the edge of a two-dimensional electron system with band inversion, realized in a narrow, 8 nm wide, HgTe quantum well. In zero magnetic field, we observe strong asymmetry of the edge potential distribution with respect to the ferromagnetic ground lead. This result indicates that the helical edge channel, specific for the structures with band inversion even at the conductive bulk, is strongly coupled to the ferromagnetic side contact, possibly due to the effects of proximity magnetization. This allows selective and spin-sensitive contacting of helical edge states.

• OSTI ID: 22617128
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 123, Issue 5; Other Information: Copyright (c) 2016 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ASYMMETRY
DISTRIBUTION
ELECTRONS
MAGNETIC FIELDS
MAGNETIZATION
MERCURY TELLURIDES
PERMALLOY
QUANTUM WELLS
SPIN ORIENTATION
STRONG-COUPLING MODEL
TWO-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL SYSTEMS