2001 Fiscal Year Final Research Report Summary
QUANTUM TRANSPORT IN TWODIMENSIONAL ELECTRON SYSTEMS: QUANTUM HALL EFFECT
Project/Area Number 
11440098

Research Category 
GrantinAid for Scientific Research (B)

Allocation Type  Singleyear Grants 
Section  一般 
Research Field 
固体物性Ⅰ(光物性・半導体・誘電体)

Research Institution  Gakushuin University 
Principal Investigator 
KAWAJI Shinji GAKUSHUIN UNIVERSITY, DEPARTMENT OF PHYSICS PROFESSOR, 理学部, 教授 (00080440)

CoInvestigator(Kenkyūbuntansha) 
KAWASHIMA Hironori GAKUSHUIN UNIVERSITY, DEPARTMENT OF PHYSICS RESEARCH ASSOCIATE, 理学部, 助手 (20327315)

Project Period (FY) 
1999 – 2001

Keywords  strong magnetic field / twodimensional electron system / quantum transport / quantum Hall effect / quantized Hall resistance / high current / collapse of quantized Hall resistance / high Hall electric field 
Research Abstract 
Following results were obtained in Landau level filling factor dependence of critical currents for collapse of the quantized Hall resistance and breakdown of the quantum Hall effec, and temperature dependence of the critical current for the collapse of the quantized Hall resistance. 1. Filling factor dependence: Magnetic field dependences of critical currents for collapse of the quantized Hall resistance I_<cr>(collapse) and for breakdown of the quantum Hall effect I_<cr>(breakdown) were measured in magnetic field around B = 5.7 T at 0.35 K. The difference I_<cr>(breakdown)I_<cr>(coilapse) decreases with deviation of the field from the filling factor 4 and the critical behaviors disappear in the filling factor smaller than 3.85 and larger than 4.15. 2. Temperature dependence of the critical collapse current: We observed that temperature dependence of the critical Hall electric field for the collapse of the quantized Hall resistance behaves close to the superconductornornmal metal phase transition in the BT/phase diagrams.

Research Products
(6 results)