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TT: Tiefe Temperaturen

TT 14: Postersitzung II: Korrelierte Systeme(1-40), Theorie der Supraleitung(41-50), Metall-Isolator-Übergang, Lokalisierung(51-66), Niederdimensionale Systeme, Quantenhalleffekt(67-80), Pinning, kritische Ströme und Vortexdynamik(81-93), HTSL-Drähte und -Bänder(94-98), Massive HTSL(99-104), supraleitende Borkarbide(105-109)

TT 14.68: Poster

Mittwoch, 19. März 1997, 15:00–18:30, Z1

Network model and spin splitting at high magnetic fields — •V. Kagalovsky¹, B. Horovitz², and Y. Avishai² — ¹Max-Planck-Institut für Kernphysik, Postfach 10 39 80, D-69029 Heidelberg — ²Department of Physics, Ben-Gurion University of the Negev, P.O. Box 653, 84105 Beer-Sheva Israel

We study dynamics of electrons in a magnetic field using a network model with two spin states per link with random mixing in a random intrachannel potential [1]. We predict that spin splitting is larger than expected for small fields (level repulsion) and is smaller than expected for large fields (level attraction) [2]. In fact, we claim that level attraction accounts for ESR data [3] which shows a nonlinear dependence of the spin splitting on B. In particular the data for N=0 in the range 8−14T is visibly nonlinear in the range 8−12T.

[1] D. K. K. Lee and J. T. Chalker, Phys. Rev. Lett. 72, 1510 (1994)

[2] V. Kagalovsky, B. Horovitz and Y. Avishai, Phys. Rev. 52, 17044 (1995)

[3] M. Dobers, K. v. Klitzing and G. Weimann, Phys. Rev. B 38, 3453 (1988)