Resistance scaling for composite fermions in the presence of a density gradient.

Journal Article · Tue Jan 31 23:00:00 EST 2006 · Proposed for publication in Physical Review B, Rapid Communications.

OSTI ID:952146

Stormer, H L ^[1]; Tsui, Daniel Chee ^[2]; Pan, Wei; West, Ken W ^[3]; Baldwin, K W ^[3]; Pfeiffer, Loren N ^[3]

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1. Columbia University, New York, NY
2. Princeton University, Princeton, NJ
3. Bell Labs, Murray Hill, NJ

The magnetoresistance, R{sub xx}, at even-denominator fractional fillings, of an ultra high quality two-dimensional electron system at T {approx} 35 mK is observed to be strictly linear in magnetic field, B. While at 35 mK R{sub xx} is dominated by the integer and fractional quantum Hall states, at T {approx_equal} 1.2 K an almost perfect linear relationship between R{sub xx} and B emerges over the whole magnetic field range except for spikes at the integer quantum Hall states. This linear R{sub xx} cannot be understood within the Composite Fermion model, but can be explained through the existence of a density gradient in our sample.

• Research Organization: Sandia National Laboratories
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 952146
• Report Number(s): SAND2006-0944J
• Journal Information: Proposed for publication in Physical Review B, Rapid Communications., Journal Name: Proposed for publication in Physical Review B, Rapid Communications.
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRONS
FERMIONS
MAGNETIC FIELDS
MAGNETORESISTANCE