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On the direct insulator-quantum Hall transition in two-dimensional electron systems in the vicinity of nanoscaled scatterers.

Liang CT, Lin LH, Kuang Yoa C, Lo ST, Wang YT, Lou DS, Kim GH, Yuan-Huei C, Ochiai Y, Aoki N, Chen JC, Lin Y, Chun-Feng H, Lin SD, Ritchie DA - Nanoscale Res Lett (2011)

Bottom Line: Such a transition has been attracting a great deal of both experimental and theoretical interests.In this study, we present three different two-dimensional electron systems (2DESs) which are in the vicinity of nanoscaled scatterers.All these three devices exhibit a direct I-QH transition, and the transport properties under different nanaoscaled scatterers are discussed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, National Taiwan University, Taipei 106, Taiwan. ctliang@phys.ntu.edu.tw.

ABSTRACT
A direct insulator-quantum Hall (I-QH) transition corresponds to a crossover/transition from the insulating regime to a high Landau level filling factor ν > 2 QH state. Such a transition has been attracting a great deal of both experimental and theoretical interests. In this study, we present three different two-dimensional electron systems (2DESs) which are in the vicinity of nanoscaled scatterers. All these three devices exhibit a direct I-QH transition, and the transport properties under different nanaoscaled scatterers are discussed.

No MeSH data available.


σxy(B) and the fit to Equation 1 for 0 <B < 3.5 T. The inset shows σxx(B) and the fit to Equation (2) for 1 T <B < 3.5 T.
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Figure 7: σxy(B) and the fit to Equation 1 for 0 <B < 3.5 T. The inset shows σxx(B) and the fit to Equation (2) for 1 T <B < 3.5 T.

Mentions: Figure 7 and the inset to Figure 7 show σxy and σxx , together with fits to Equations 1 and 2 over limited ranges for Sample C, respectively. From the fits, it is possible to determine the respective renormalized mobilites as a function of temperature as shown in Figure 8a for Sample C and in Figure 8b for Sample A. The renormalized mobility calculated using Equation 1 is only slightly larger than that using Equation 2. It may be possible that different mobilities should be taken into account to understand the direct I-QH transition [37,43,45].


On the direct insulator-quantum Hall transition in two-dimensional electron systems in the vicinity of nanoscaled scatterers.

Liang CT, Lin LH, Kuang Yoa C, Lo ST, Wang YT, Lou DS, Kim GH, Yuan-Huei C, Ochiai Y, Aoki N, Chen JC, Lin Y, Chun-Feng H, Lin SD, Ritchie DA - Nanoscale Res Lett (2011)

σxy(B) and the fit to Equation 1 for 0 <B < 3.5 T. The inset shows σxx(B) and the fit to Equation (2) for 1 T <B < 3.5 T.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211178&req=5

Figure 7: σxy(B) and the fit to Equation 1 for 0 <B < 3.5 T. The inset shows σxx(B) and the fit to Equation (2) for 1 T <B < 3.5 T.
Mentions: Figure 7 and the inset to Figure 7 show σxy and σxx , together with fits to Equations 1 and 2 over limited ranges for Sample C, respectively. From the fits, it is possible to determine the respective renormalized mobilites as a function of temperature as shown in Figure 8a for Sample C and in Figure 8b for Sample A. The renormalized mobility calculated using Equation 1 is only slightly larger than that using Equation 2. It may be possible that different mobilities should be taken into account to understand the direct I-QH transition [37,43,45].

Bottom Line: Such a transition has been attracting a great deal of both experimental and theoretical interests.In this study, we present three different two-dimensional electron systems (2DESs) which are in the vicinity of nanoscaled scatterers.All these three devices exhibit a direct I-QH transition, and the transport properties under different nanaoscaled scatterers are discussed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, National Taiwan University, Taipei 106, Taiwan. ctliang@phys.ntu.edu.tw.

ABSTRACT
A direct insulator-quantum Hall (I-QH) transition corresponds to a crossover/transition from the insulating regime to a high Landau level filling factor ν > 2 QH state. Such a transition has been attracting a great deal of both experimental and theoretical interests. In this study, we present three different two-dimensional electron systems (2DESs) which are in the vicinity of nanoscaled scatterers. All these three devices exhibit a direct I-QH transition, and the transport properties under different nanaoscaled scatterers are discussed.

No MeSH data available.