We show, from self-consistent calculations, that the effective mass for motion of holes along a two-dimensional (111) Ge layer is almost an order of magnitude smaller than the bulk heavy hole mass, which determines the intersubband distances. This creates a unique situation of multiple populated electric subbands at moderate hole densities p_s and layer widths. Depopulation of two or more upper subbands in a 38 nm wide p-Ge layer with p_s=5×10¹⁵m^-2 has been revealed from the magnetoresistance in high parallel magnetic fields, while a collapse of the quantum Hall state for filling factor ν=1 indicates that two ground subbands merge in a self-formed double-quantum-well potential profile. The latter effect in the valence band is shown to be sensitive to the layer deformation.

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References

S. M. Girvin and A. H. MacDonald , Perspectives in Quantum Hall Effects , eds. S. Das Sarma and A. Pinczuk ( J. Wiley , New York , 1997 ) . Google Scholar
C. S. Sergioet al., Phys. Rev. B 64, 115314 (2001), DOI: 10.1103/PhysRevB.64.115314. Crossref, Web of Science, ADS, Google Scholar
G. M. Gusevet al., Phys. Rev. B 65, 205316 (2002), DOI: 10.1103/PhysRevB.65.205316. Crossref, Web of Science, Google Scholar
G. M. Gusevet al., Workbook.of International Conference EP2DS-15 (2003) p. 366, 762. Google Scholar
J. P. Eisenstein , Perspectives in Quantum Hall Effects , eds. S. Das Sarma and A. Pinczuk ( J. Wiley , New York , 1997 ) . Google Scholar
E. Tutuc et al., Phys. Rev. Lett. 91, 076802 (2003). W. R. Clarke et al., see Ref. 4, p. 187 . Google Scholar
M. V. Yakunin et al., see Ref. 4, p. 493 [Physica E22, 68 (2004)] . Google Scholar
M. V. Yakunin et al. , Proc. of International Conference SemiMag-15 ( Oxford , UK , 2002 ) . Google Scholar
G. S. Boebingeret al., Phys. Rev. Lett. 64, 1793 (1990), DOI: 10.1103/PhysRevLett.64.1793. Crossref, Web of Science, ADS, Google Scholar