1998
DOI: 10.1103/physrevb.58.r7532
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Absence of floating delocalized states in a two-dimensional hole gas

Abstract: By tracking the delocalized states of the two-dimensional hole gas in a p-type GaAs/AlGaAs heterostructure as a function of magnetic field, we mapped out a phase diagram in the density -magnetic field plane. We found that the energy of the delocalized state from the lowest Landau level flattens out as the magnetic field tends toward zero. This finding is different from that for the two-dimensional electron system in an n-type GaAs/AlGaAs heterostructure where delocalized states diverge in energy as B goes to z… Show more

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Cited by 27 publications
(28 citation statements)
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“…[31]). If this assumption were to be correct, a similar prediction should also hold for more complex situations such as in the FQH states in bilayers, spin unresolved single layer systems, and other cases where more that one subband may be present [34], or for 2D hole gases where Kramers states are present [35]. A few predictions for tunneling exponents for the simplest Halperin states have been proposed in the literature [36].…”
Section: Introductionmentioning
confidence: 99%
“…[31]). If this assumption were to be correct, a similar prediction should also hold for more complex situations such as in the FQH states in bilayers, spin unresolved single layer systems, and other cases where more that one subband may be present [34], or for 2D hole gases where Kramers states are present [35]. A few predictions for tunneling exponents for the simplest Halperin states have been proposed in the literature [36].…”
Section: Introductionmentioning
confidence: 99%
“…[2,41,42] The stability of the metallic phase has also been supported by studies [43][44][45] of the quantum Hall effect at small non-zero H: Theoretically [46,47], a sequence of transitions resulting from the "floating up" of the extended states is predicted to occur as the expected insulating state is approached as H → 0, and indeed this is observed in smaller r s devices [48,49]. However, at large r s , the delocalized states (or more precisely, the critical lines separating different integer quantum Hall states) do not move up in energy as H → 0, thus allowing for a metallic state at H = 0.…”
Section: Intermediate "Metallic" Phasesmentioning
confidence: 89%
“…The current observation is consistent with the studies that have been done in the past for the 2DHS through transport measurements. 18,19 This implies that for the 2DHS there is indeed a metallic regime (as shown) in the thermodynamic limit which does not exist in the phase diagrams for the 2DES. We would like to note here the data in Fig.…”
Section: 6mentioning
confidence: 92%