1 Ocak 2017 Dergi makalesi Açık Erişim

Kendirlik, E. M.; Sirt, S.; Kalkan, S. B.; Ofek, N.; Umansky, V.; Siddiki, A.

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    <subfield code="a">The local nature of incompressibility of quantum Hall effect</subfield>
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    <subfield code="a">Since the experimental realization of the integer quantum Hall effect in a two-dimensional electron system, the interrelation between the conductance quantization and the topological properties of the system has been investigated. Assuming that the two-dimensional electron system is described by a Bloch Hamiltonian, system is insulating in the bulk of sample throughout the quantum Hall plateau due to a magnetic field induced energy gap. Meanwhile, the system is conducting at the edges resembling a 2+1 dimensional topological insulator without time-reversal symmetry. Here, by our magneto-transport measurements performed on GaAs/AlGaAs high purity Hall bars with two inner contacts we show that incompressible strips formed at the edges result in Hall quantization, even if the bulk is compressible. Consequently, the relationship between the quantum Hall effect and topological bulk insulator breaks for specific field intervals within the plateaus. The measurement of conducting bulk, strongly challenges all existing single-particle theories.</subfield>
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    <subfield code="u">Mimar Sinan Fine Arts Univ, Sci &amp; Letters Fac, Dept Phys, TR-34380 Istanbul, Turkey</subfield>
    <subfield code="a">Sirt, S.</subfield>
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    <subfield code="u">Istanbul Univ, Dept Phys, Fac Sci, TR-34134 Istanbul, Turkey</subfield>
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    <subfield code="u">Yale Univ, Dept Appl Phys, 217 Prospect St, New Haven, CT 06511 USA</subfield>
    <subfield code="a">Ofek, N.</subfield>
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    <subfield code="u">Istanbul Univ, Dept Phys, Fac Sci, TR-34134 Istanbul, Turkey</subfield>
    <subfield code="a">Kendirlik, E. M.</subfield>
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