The quantum Hall effect in quantum dot systems

27th International Conference on Low Temperature Physics

Beltukov, Y.M.^1 ; Greshnov, A.A.^1,2

Ioffe Physical-Technical Institute RAS, Polytechnicheskaya 26, St-Petersburge, Russia^1

Saint Petersburg Electrotechnical University, Professora Popova 5, St-Petersburge, Russia^2

关键词: Elevated temperature;    Experimental groups;    Fock-Darwin spectrum;    Hall conductivity;    Numerical calculation;    Polynomial methods;    Quantum dot systems;    Quantum Hall measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/5/052011/pdf
DOI  :  10.1088/1742-6596/568/5/052011

来源: IOP

【 摘 要 】

It is proposed to use quantum dots in order to increase the temperatures suitable for observation of the integer quantum Hall effect. A simple estimation using Fock-Darwin spectrum of a quantum dot shows that good part of carriers localized in quantum dots generate the intervals of plateaus robust against elevated temperatures. Numerical calculations employing local trigonometric basis and highly efficient kernel polynomial method adopted for computing the Hall conductivity reveal that quantum dots may enhance peak temperature for the effect by an order of magnitude, possibly above 77 K. Requirements to potentials, quality and arrangement of the quantum dots essential for practical realization of such enhancement are indicated. Comparison of our theoretical results with the quantum Hall measurements in InAs quantum dot systems from two experimental groups is also given.