Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Imaging Transport Resonances in the Quantum Hall Effect G. A. Steele,1
 

Summary: Imaging Transport Resonances in the Quantum Hall Effect
G. A. Steele,1
R. C. Ashoori,1
L. N. Pfeiffer,2
and K. W. West2
1
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2
Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA
(Received 13 June 2005; published 23 September 2005)
We use a scanning capacitance probe to image transport in the quantum Hall system. Applying a dc bias
voltage to the tip induces a ring-shaped incompressible strip (IS) in the 2D electron system (2DES) that
moves with the tip. At certain tip positions, short-range disorder in the 2DES creates a quantum dot island
in the IS. These islands enable resonant tunneling across the IS, enhancing its conductance by more than 4
orders of magnitude. The images provide a quantitative measure of disorder and suggest resonant
tunneling as the primary mechanism for transport across ISs.
DOI: 10.1103/PhysRevLett.95.136804 PACS numbers: 73.43.Fj, 73.23.Hk, 73.40.Gk
In the quantum Hall effect (QHE), the Hall resistance of
a two-dimensional electronic system (2DES) is quantized
with high precision to values that depend only on funda-

  

Source: Ashoori, Raymond - Department of Physics, Massachusetts Institute of Technology (MIT)

 

Collections: Physics