UNSPECIFIED (1998) Searches for skyrmions in the limit of zero g-factor. SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 13 (7). pp. 671-679. ISSN 0268-1242

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Abstract

Energy gaps have been measured for the ferromagnetic quantum Hall effect states at v =1 and 3 in GaAs/Ga0.7Al0.3As heterojunctions as a function of Zeeman energy, which is reduced to zero by applying hydrostatic pressures of up to 20 kbar. At large Zeeman energy the gaps are consistent with spin-wave excitations. For a low-density sample the gap at v = 1 decreases with increasing pressure and reaches a minimum when the g-factor vanishes. At small Zeeman energy the excitation appears to consist of a large number of reversed spins and may be interpreted as a skyrmion. The data also suggest that skyrmionic excitations take place at v = 3. The width of the minimum at v = 1 is found to decrease as the g-factor is reduced in a similar way for all samples.

Item Type:	Journal Article
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics
Journal or Publication Title:	SEMICONDUCTOR SCIENCE AND TECHNOLOGY
Publisher:	IOP PUBLISHING LTD
ISSN:	0268-1242
Date:	July 1998
Volume:	13
Number:	7
Number of Pages:	9
Page Range:	pp. 671-679
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/15542

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