Charge transport in the fractional quantum Hall liquid to Wigner solid transition regime
The formation of spin-reversed pairs of electrons at low magnetic field (B) has been suggested as a possible mechanism for the even-denominator quantization in the fractional quantum Hall (FQH) regime of the two-dimensional electron system (2DES). The authors examined the possibilities of the even-denominator quantization at filling factors v = 1/2, 3/4, 5/8, 3/2, and 5/2, in the very-low-density regime down to the lowest ever reported density of 4.0 [times] 10[sup 9] cm[sup [minus]2]. The quantization at v = 5/2 is observed at a density as low as 1.3 [times] 10[sup 11] cm[sup [minus]2]. The authors also observed the development of new FQH states at v = 8/11 and 8/13. The authors have systematically studied the generic transport characteristics of the newly discovered reentrant insulating phase (IP) around v = 1/5. The authors present the first observation of quantized Hall plateaus p[sub xy] = 5h/e[sup 2] down to 22mK at v = 1/5, and [rho][sub xy] = 9h/2e[sup 2] down to 40 mK at v = 2/9. The authors demonstrate that the Hall resistance is normal in the reentrant IP for v not much smaller than 1.5. The results rule out the possibility of single-particle magnetic freeze-out as the mechanism behind the formation of the reentrant IP for v not much smaller than 1/5. The data are consistent with the possible existence of WC or Hall insulator. The authors studied the generic overall features and finer details of the (B, v, T) evolution of the Ohmic [rho][sub xx], and examined the presence of strikingly diverse nonlinear 4-terminal I-V characteristics in the reentrant IP. The various distinct characteristic T's deduced from the Ohmic p[sub xx], I-V, and noise measurements are discussed. The systematic (B, v, T) evolution of the sharp I-V characteristics are analyzed. The results can be interpreted in terms of a weakly-pinned 2DWC reentrant around the 1/5 FQH liquid for B < 12.70T (with v = 1/5 at B = 11.90T), and Wigner glass for B > 12.70T.
- Research Organization:
- Princeton Univ., NJ (United States)
- OSTI ID:
- 7232853
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Two-dimensional metal-insulator transition and in-plane magnetoresistance in a high mobility strained Si quantum well.
Exact Quantization of the Even-Denominator Fractional Quantum Hall State at {nu} =5/2 Landau Level Filling Factor
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
74 ATOMIC AND MOLECULAR PHYSICS
CRYSTALS
HALL EFFECT
WIGNER THEORY
LIQUIDS
CHARGE TRANSPORT
LATTICE FIELD THEORY
PHASE TRANSFORMATIONS
QUANTIZATION
FIELD THEORIES
FLUIDS
QUANTUM FIELD THEORY
665430* - Other Topics in Quantum Fluids & Solids- (1992-)
664000 - Atomic & Molecular Physics- (1992-)