Anomalous resistance overshoot in the integer quantum Hall effect

Kendirlik, E. M.; Sirt, S.; Kalkan, Sırrı Batuhan; Dietsche, W.; Wegscheider, Werner; Ludwig, Stefan; Siddiki, A.

doi:10.48550/arxiv.1305.1156

Cited by 1 publication

(4 citation statements)

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“…The dip effect becomes stronger when increasing the temperature, since the incompressible strip assuming ν(x) = 2 collapses easier at higher temperatures. This finding is also consistent with the recent experiments concerning the overshoot effect [17].…”

Section: Resultssupporting

confidence: 94%

“…In this section, we employ the above explained calculation scheme to investigate the dip effect, which is observed at the low or high B field end of a quantized Hall plateau. First, we discuss the effect of sample size where we show that the dip effect tends to disappear at narrower samples, in contrast to overshoot effect [17]. Next the effect of disorder is investigated from short-range impurity scattering point of view, namely the influence of level broadening on the dip effect, together with the long-range potential fluctuations aspect.…”

Section: Resultsmentioning

confidence: 96%

“…An AC voltage is driven between the source and drain contacts at 11.5 Hz, with an excitation amplitude of 100 mV corresponding an sample current of 100 nA. Details of experimental setup and sample properties are discussed elsewhere [17]. Fig.…”

Section: Experimental Realization: Proof Of Conceptmentioning

confidence: 99%

“…In a very recent experimental investigation, the predictions of the screening theory based overshoot effect is successfully tested. It is experimentally shown that, the edge re-construction due to direct Coulomb interactions modify the amplitude and temperature dependency of the overshoot effect [17]. In this work we tackle the dip effect utilizing the screening theory and investigate theoretically the sample and temperature dependent properties of this transport anomaly.…”

Section: Introductionmentioning

confidence: 99%

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The dip effect under integer quantized Hall conditions

et al. 2014

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In this work we investigate an unusual transport phenomenon observed in two-dimensional electron gas under integer quantum Hall effect conditions. Our calculations are based on the screening theory, using a semi-analytical model. The transport anomalies are dip and overshoot effects, where the Hall resistance decreases (or increases) unexpectedly at the quantized resistance plateaus intervals. We report on our numerical findings of the dip effect in the Hall resistance, considering GaAs/AlGaAs heterostructures in which we investigated the effect under different experimental conditions. We show that, similar to overshoot, the amplitude of the dip effect is strongly influenced by the edge reconstruction due to electrostatics. It is observed that the steep potential variation close to the physical boundaries of the sample results in narrower incompressible strips, hence, the experimental observation of the dip effect is limited by the properties of these current carrying strips. By performing standard Hall resistance measurements on gate defined narrow samples, we demonstrate that the predictions of the screening theory is in well agreement with our experimental findings. PACS. 73.43.-f Quantum Hall effect -73.43.Cd Theory and modeling -73.43.Fj Novel experimental methods; measurements

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Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 96%

Section: Experimental Realization: Proof Of Conceptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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