TY - JOUR
T1 - Quantization and chiral edge state properties in nearly 3D quantum well structures
AU - Zhang, B.
AU - Brooks, J. S.
AU - Wang, Z.
AU - Perenboom, J. A.A.J.
AU - Simmons, J.
AU - Reno, J.
AU - Lumpkin, N.
AU - O'Brien, J.
AU - Clark, R.
PY - 1998/12/2
Y1 - 1998/12/2
N2 - We report magneto-transport measurements including Hall, Rxy, longitudinal, Rxx, and vertical, Rzz, magnetoresistance on nearly 3-dimensional (3D) 200 layer GaAs/AlGaAs quantum well structures. Although the interlayer band-width is nearly 20% of the Fermi energy, we still observe complete quantization of the Hall resistance for the 3D quantum Hall state. The temperature dependence of the Rxx minimum shows two unusual features: initially, at higher temperatures 1 K where the quantum Hall state develops, a gap with an activation energy much smaller than the Landau gap is observed; in the low temperature limit 0.030 K a variable range hopping behavior takes over with a residual resistivity limit. Independent measurements of Gzz (in 3D ≈ 1/Rzz) where the chiral edge states dominate the vertical transport show the same temperature dependence.
AB - We report magneto-transport measurements including Hall, Rxy, longitudinal, Rxx, and vertical, Rzz, magnetoresistance on nearly 3-dimensional (3D) 200 layer GaAs/AlGaAs quantum well structures. Although the interlayer band-width is nearly 20% of the Fermi energy, we still observe complete quantization of the Hall resistance for the 3D quantum Hall state. The temperature dependence of the Rxx minimum shows two unusual features: initially, at higher temperatures 1 K where the quantum Hall state develops, a gap with an activation energy much smaller than the Landau gap is observed; in the low temperature limit 0.030 K a variable range hopping behavior takes over with a residual resistivity limit. Independent measurements of Gzz (in 3D ≈ 1/Rzz) where the chiral edge states dominate the vertical transport show the same temperature dependence.
KW - Edge states
KW - GaAs
KW - Quantum Hall effect
KW - Quantum well
KW - Two-dimensional gas
UR - http://www.scopus.com/inward/record.url?scp=0346938919&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(98)00597-3
DO - 10.1016/S0921-4526(98)00597-3
M3 - Article
AN - SCOPUS:0346938919
SN - 0921-4526
VL - 256-258
SP - 279
EP - 282
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
ER -