Wurstbauer, Ursula and Soda, Marcello and Jakiela, R and Schuh, Dieter and Weiss, Dieter and Zweck, Josef and Wegscheider, Werner (2009) Coexistence of ferromagnetism and quantum Hall effect in Mn modulation-doped two-dimensional hole systems. Journal of Chrystal Growth 311, p. 2160.
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Other URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TJ6-4TPF4R9-B&_user=616165&_coverDate=03%2F15%2F2009&_alid=912175744&_rdoc=1&_fmt=high&_orig=search&_cdi=5302&_sort=d&_docanchor=&view=c&_ct=1&_acct=C000032338&_version=1&_urlVersion=0&_userid=616, http://www.sciencedirect.com/science/journal/00220248
Modulation doping using Mn as an acceptor has been applied to the molecular beam epitaxial grown compressively strained InAs channels. Strain engineering has been accomplished by the growth of a graded, fully relaxed InxAl1-xAs buffer layer on GaAs(0 0 1) substrates in which the In content x was increased from 0% to 75%. Transmission electron microscopical investigation of the heterostructures reveals the high quality of the heterostructures grown on top of the metamorphic buffer layer. Significant segregation and diffusion of the Mn doping profile is confirmed by secondary ion mass spectroscopical analysis. Both normal as well as inverted doped quantum well structures show pronounced Shubnikov-de Haas oscillations and quantum Hall effect plateaus. However, for the inverted heterostructures where a significant Mn concentration within the InAs channel can be detected, a strong resistance maximum at B=0 T accompanied by a hysteretic behaviour and reproducible resistance jumps indicative of ferromagnetic ordering is observed.
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss
Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Josef Zweck
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||25 May 2009 15:22|
|Last Modified:||06 Jul 2010 13:40|
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