Exact Quantization of the Even-Denominator Fractional Quantum Hall State at {nu} =5/2 Landau Level Filling Factor
- Princeton University, Princeton, New Jersey 08544 (United States)
- NHMFL, Tallahassee, Florida 32310 (United States)
- University of Florida, Gainesville, Florida 32611 (United States)
- Columbia University, New York, New York 10027 (United States)
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)
We report ultralow temperature experiments on the obscure fractional quantum Hall effect at Landau level filling factor {nu}=5/2 in a very high-mobility specimen of {mu}=1.7{times}10{sup 7} cm {sup 2}/Vthinsp s . We achieve an electron temperature as low as {approximately}4 mK , where we observe vanishing R{sub xx} and, for the first time, a quantized Hall resistance, R{sub xy}=h/(5/2)e{sup 2} to within 2thinspthinspppm. R{sub xy} at the neighboring odd-denominator states {nu}=7/3 and 8/3 is also quantized. The temperature dependences of the R{sub xx} minima at these fractional fillings yield activation energy gaps {Delta}{sub 5/2}=0.11 , {Delta}{sub 7/3}=0.10 , and {Delta}{sub 8/3}=0.055 K . {copyright} {ital 1999} {ital The American Physical Society }
- OSTI ID:
- 688042
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 83; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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