Abstract
It is detected experimentally for the first time that the connection of 2D electron systems with different electrochemical potentials results in long-range (τ 50 μm) electron density disturbances. When a gated region of a Corbino sample is strongly depleted, the amplitude of the magnetoresistance oscillations caused by high density ungated regions is found to increase in direct proportion to the sample resistance, which is dominated by low-density regions with small conductivity. Experiments on samples with an artificial potential profile (antidots and etched rings) below the gate show that the observed effects are not due to contact effects.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
D. C. Tsui and S. J. AllenJr., Phys. Rev. Lett. 32, 1200 (1974).
S. V. Kravchenko, Jos A. A. J. Perenboom, and V. M. Pudalov, Phys. Rev. B 44, 13 513 (1991).
M. D’Iorio, V. M. Pudalov, and S. G. Semenchinsky, Phys. Rev. B 46, 992 (1992).
V. T. Dolgopolov, G. V. Kravchenko, A. A. Shashkin, and S. V. Kravchenko, Phys. Rev. B 46, 13 303 (1992).
A. A. Shashkin, G. V. Kravchenko, and V. T. Dolgopolov, JETP Lett. 58, 220 (1993).
A. A. Shashkin, V. T. Dolgopov, and G. V. Kravchenko, Phys. Rev. B 49, 14 486 (1994).
H. W. Jiang, C. E. Johnson, K. L. Wang, and S. T. Hannahs, Phys. Rev. Lett. 71, 1439 (1993).
T. Wang, K. P. Clark, G. F. Spencer et al., Phys. Rev. Lett. 72, 709 (1994).
R. J. F. Hughes, J. T. Nicholls, J. E. F. Frost et al., J. Phys. Condens. Matter 6, 4763 (1994).
I. Glozman, C. E. Johnson, and H. W. Jiang, Phys. Rev. Lett. 74, 594 (1995).
D. E. Khmelnitskii, Phys. Lett 106, 182 (1984); D. E. Khmelnitskii, Helv. Phys. Acta. 65, 164 (1992).
R. B. Laughlin, Phys. Rev. Lett. 52, 2304 (1984).
T. Ando, A. B. Fowler, and F. Stern, Rev. Mod. Phys. 54, 437 (1982).
S. I. Dorozhkin, JETP Lett. 60, 578 (1994).
A. A. Shashkin, V. T. Dolgopolov, G. V. Kravchenko et al., Phys. Rev. Lett. 73, 3141 (1994).
Author information
Authors and Affiliations
Additional information
Pis’ma Zh. Eksp. Teor. Fiz. 63, No. 1, 55–60 (10 January 1996)
Published in English in the original Russian journal. Edited by Steve Torstveit.
Rights and permissions
About this article
Cite this article
Dolgopolov, V.T., Shashkin, A.A., Kravchenko, G.V. et al. Giant growth of quantum oscillations in an inhomogeneous 2D electron system. Jetp Lett. 63, 63–69 (1996). https://doi.org/10.1134/1.566964
Received:
Issue Date:
DOI: https://doi.org/10.1134/1.566964