Topographic mapping of the quantum hall liquid using a few-electron bubble

Science

Volumn 289, Issue 5476, 2000, Pages 90-94

  Finkelstein, G ^a   Glicofridis, P I ^a   Ashoori, R C ^a   Shayegan, M ^a  

^a NONE

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; ELECTRIC POTENTIAL; ELECTRON; LIQUID; MICROSCOPY; PRIORITY JOURNAL; QUANTUM CHEMISTRY; SEMICONDUCTOR;

EID: 0034617242     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.289.5476.90     Document Type: Article

References (21)

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16. Single-electron features may also be observed in the SCA imaging if there exist localized "puddles" of electrons formed within the quantum Hall liquid. In this case, a biased tip scanning across a puddle would act as a gate, changing the number of electrons in it. The SCA images would then exhibit concentric rings of high and low SCA signal. Because each puddle would have its own distinct series of electron additions, the set of rings from different puddles would superimpose. Experimentally, the bright and dark bands form a single network of contour lines that never intersect. Therefore, we conclude that there exists only one few-electron bubble formed under the tip.
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18. Contour lines reappear when we apply negative tip-sample voltages depleting the 2DEG at B < 6 T, when more than one Landau level is filled in the bulk of the sample. Here, we attribute them to a Coulomb blockade in a bubble formed by quasi-holes in the filled Landau level. See also I. J. Maasilta and V. J. Goldman, Phys. Rev. B 57, R4273 (1998); M. Kataoka et al., Phys. Rev. Lett. 83, 160 (1999).
19. Contour lines reappear when we apply negative tip- sample voltages depleting the 2DEG at B < 6 T, when more than one Landau level is filled in the bulk of the sample. Here, we attribute them to a Coulomb blockade in a bubble formed by quasi-holes in the filled Landau level. See also I. J. Maasilta and V. J. Goldman, Phys. Rev. B 57, R4273 (1998); M. Kataoka et al., Phys. Rev. Lett. 83, 160 (1999).
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21. We thank L. S. Levitov and M. Brodsky for numerous discussions. Supported by the Office of Naval Research, the Packard Foundation, Joint Services Electronics Program, and the National Science Foundation Division of Materials Research.