Quantum lifetimes in antidot arrays

Kyung-hwa Yoo; J. W. Park; H. C. Kwon; J. B. Choi

doi:10.1016/S0921-4526(99)03008-2

Quantum lifetimes in antidot arrays

Kyung-hwa Yoo, J. W. Park, H. C. Kwon, J. B. Choi

Department of Physics

Research output: Contribution to journal › Article

Abstract

Magnetotransport in GaAs/Ga_1-xAl_xAs heterostructures with a square array of antidots has been investigated. Quantum lifetimes τ_q are estimated from the amplitudes of Shubnikov-de Haas oscillations and two values of τ_q are found at low and high magnetic fields. The critical field at which τ_q changes corresponds to the magnetic field where the cyclotron diameter 2R_c is almost equal to the effective constriction length L_c between two antidots. This suggests that the influence of scattering from antidots on τ_q is different in the regions where 2R_c > L_c and where 2R_c < L_c.

Original language	English
Pages (from-to)	1910-1911
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	284-288
Issue number	PART II
DOIs	https://doi.org/10.1016/S0921-4526(99)03008-2
Publication status	Published - 2000 Jan 1

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All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Cite this

Yoo, K., Park, J. W., Kwon, H. C., & Choi, J. B. (2000). Quantum lifetimes in antidot arrays. Physica B: Condensed Matter, 284-288(PART II), 1910-1911. https://doi.org/10.1016/S0921-4526(99)03008-2

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AU - Yoo, Kyung-hwa

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AU - Kwon, H. C.

AU - Choi, J. B.

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N2 - Magnetotransport in GaAs/Ga1-xAlxAs heterostructures with a square array of antidots has been investigated. Quantum lifetimes τq are estimated from the amplitudes of Shubnikov-de Haas oscillations and two values of τq are found at low and high magnetic fields. The critical field at which τq changes corresponds to the magnetic field where the cyclotron diameter 2Rc is almost equal to the effective constriction length Lc between two antidots. This suggests that the influence of scattering from antidots on τq is different in the regions where 2Rc > Lc and where 2Rc < Lc.

AB - Magnetotransport in GaAs/Ga1-xAlxAs heterostructures with a square array of antidots has been investigated. Quantum lifetimes τq are estimated from the amplitudes of Shubnikov-de Haas oscillations and two values of τq are found at low and high magnetic fields. The critical field at which τq changes corresponds to the magnetic field where the cyclotron diameter 2Rc is almost equal to the effective constriction length Lc between two antidots. This suggests that the influence of scattering from antidots on τq is different in the regions where 2Rc > Lc and where 2Rc < Lc.

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10.1016/S0921-4526(99)03008-2