Terahertz emission characteristics of GaMnAs dilute magnetic semiconductor under 650 mT external magnetic field

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Current Applied Physics

Volume

17

Issue

4

First Page

522

Last Page

526

Publication Date

4-1-2017

Abstract

We investigate the effects of an externally applied magnetic field on the terahertz (THz) emission of Gallium Manganese Arsenide (GaMnAs) films grown via molecular beam epitaxy (MBE). Results show that low Mn-doping in GaMnAs resulted to increased THz emission as compared with a SI-GaAs substrate. Further increase in Mn-doping content resulted to a comparably less THz emission, which is attributed to reduced crystallinity and higher free-carrier absorption. Under an external magnetic field, the contributions of the Bup and Bdown-related THz emission were observed to be asymmetric: possibly due to intrinsic magnetic properties of GaMnAs. © 2017 Elsevier B.V.

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Digitial Object Identifier (DOI)

10.1016/j.cap.2017.01.021

Disciplines

Physics

Keywords

Gallium arsenide; Molecular beam epitaxy; Terahertz spectroscopy

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