Abstract
We employ a magnetocapacitance technique to study the spectrum of the soft two-subband (or double-layer) electron system in a parabolic quantum well with a narrow tunnel barrier at the center. In this system, when unbalanced by gate depletion, two sets of quantum oscillations are observed at temperatures T≳30 mK: one originates from the upper electron subband in the closer-to-the-gate part of the well, and the other indicates the existence of common gaps in the spectrum at integer fillings. For the lowest filling factors υ=1 and υ=2, both the presence of a common gap down to the point of the one-to two-subband transition and their nontrivial magnetic field dependences point to magnetic-field-induced hybridization of electron subbands.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
G. S. Boebinger, H. W. Jiang, L. N. Pfeiffer, and K. W. West, Phys. Rev. Lett. 64, 1793 (1990).
Y. W. Suen, J. Jo, M. B. Santos et al., Phys. Rev. B 44, 5947 (1991).
A. H. MacDonald, P. M. Platzman, and G. S. Boebinger, Phys. Rev. Lett. 65, 775 (1990).
L. Brey, Phys. Rev. Lett. 65, 903 (1990).
S. Q. Murphy, J. P. Eisenstein, G. S. Boebinger et al., Phys. Rev. Lett. 72, 728 (1994).
T. S. Lay, Y. W. Suen, H. C. Manoharan et al., Phys. Rev. B 50, 17725 (1994).
Y. W. Suen, L. W. Engel, M. B. Santos et al., Phys. Rev. Lett. 68, 1379 (1992).
J. P. Eisenstein, G. S. Boebinger, L. N. Pfeiffer et al., Phys. Rev. Lett. 68, 1383 (1992).
Y. W. Suen, J. Jo, M. B. Santos et al., Phys. Rev. B 44, 5947 (1991).
Y. W. Suen, H. C. Manoharan, X. Ying et al., Surf. Sci. 305, 13 (1994).
T. Chakraborty and P. Pietilainen, Phys. Rev. Lett. 59, 2784 (1987).
D. Yoshioka, A. H. MacDonald, and S. M. Girvin, Phys. Rev. B 39, 1932 (1989).
H. A. Fertig, Phys. Rev. B 40, 1087 (1989).
S. He, X. C. Xie, S. Das Sarma, and F. C. Zhang, Phys. Rev. B 43, 9339 (1991).
A. G. Davies, C. H. W. Barnes, K. R. Zolleis et al., Phys. Rev. B 54, R17331 (1996).
R. C. Ashoori and R. H. Silsbee, Solid State Commun. 81, 821 (1992).
V. T. Dolgopolov, A. A. Shashkin, A. V. Aristov et al., Phys. Low-Dimens. Semicond. Struct. 6, 1 (1996); V. T. Dolgopolov, A. A. Shashkin, A. V. Aristov et al., Phys. Rev. Lett. 79, 729 (1997).
M. Hartung, A. Wixforth, K. L. Campman, and A. C. Gossard, Solid-State Electron. 40, 113 (1996).
G. Salis, B. Graf, K. Ensslin et al., Phys. Rev. Lett. 79, 5106 (1997).
T. Jungwirth and A. H. MacDonald, Phys. Rev. B 53, 9943 (1996).
Author information
Authors and Affiliations
Additional information
Pis’ma Zh. Éksp. Teor. Fiz. 67, No. 8, 563–568 (25 April 1998)
Published in English in the original Russian journal. Edited by Steve Torstveit.
Rights and permissions
About this article
Cite this article
Dolgopolov, V.T., Tsydynzhapov, G.E., Shashkin, A.A. et al. Magnetic-field-induced hybridization of electron subbands in a coupled double quantum well. Jetp Lett. 67, 595–601 (1998). https://doi.org/10.1134/1.567732
Received:
Issue Date:
DOI: https://doi.org/10.1134/1.567732