Interfacial and bulk polaron masses in Zn1-xMgxO/ZnO heterostructures examined by terahertz time-domain cyclotron spectroscopy

J. Lloyd-Hughes; M. Failla; J. Ye; S. P.P. Jones; K. L. Teo; C. Jagadish

doi:10.1063/1.4921469

Interfacial and bulk polaron masses in Zn_1-_xMg_xO/ZnO heterostructures examined by terahertz time-domain cyclotron spectroscopy

J. Lloyd-Hughes, M. Failla, J. Ye, S. P.P. Jones, K. L. Teo, C. Jagadish

Research output: Contribution to journal › Article › peer-review

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Abstract

The cyclotron resonance of polarons in Zn_1-_xMg_xO/ZnO heterostructures (with 0.15 < x < 0.22) was studied by terahertz time-domain spectroscopy. Low-temperature magnetoconductivity spectra of the 2D electron gas at the Zn_1-_xMg_xO/ZnO interface determined the polaron density, mass, and scattering rate. The cyclotron mass of 2D polarons was found to increase significantly with magnetic field B from 0.24 m_e at B = 2 T to 0.37 m_e at B = 7.5 T. A nonlinear cyclotron frequency with B was also observed for 3D polarons in ZnO. The findings are discussed in the context of polaron mass renormalization driven by the electron-LO-phonon and electron-acoustic phonon interactions.

Original language	English
Article number	202103
Journal	Applied Physics Letters
Volume	106
Issue number	20
DOIs	https://doi.org/10.1063/1.4921469
Publication status	Published - 18 May 2015

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title = "Interfacial and bulk polaron masses in Zn1-xMgxO/ZnO heterostructures examined by terahertz time-domain cyclotron spectroscopy",

abstract = "The cyclotron resonance of polarons in Zn1-xMgxO/ZnO heterostructures (with 0.15 < x < 0.22) was studied by terahertz time-domain spectroscopy. Low-temperature magnetoconductivity spectra of the 2D electron gas at the Zn1-xMgxO/ZnO interface determined the polaron density, mass, and scattering rate. The cyclotron mass of 2D polarons was found to increase significantly with magnetic field B from 0.24 me at B = 2 T to 0.37 me at B = 7.5 T. A nonlinear cyclotron frequency with B was also observed for 3D polarons in ZnO. The findings are discussed in the context of polaron mass renormalization driven by the electron-LO-phonon and electron-acoustic phonon interactions.",

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T1 - Interfacial and bulk polaron masses in Zn1-xMgxO/ZnO heterostructures examined by terahertz time-domain cyclotron spectroscopy

AU - Lloyd-Hughes, J.

AU - Failla, M.

AU - Ye, J.

AU - Jones, S. P.P.

AU - Teo, K. L.

AU - Jagadish, C.

PY - 2015/5/18

Y1 - 2015/5/18

N2 - The cyclotron resonance of polarons in Zn1-xMgxO/ZnO heterostructures (with 0.15 < x < 0.22) was studied by terahertz time-domain spectroscopy. Low-temperature magnetoconductivity spectra of the 2D electron gas at the Zn1-xMgxO/ZnO interface determined the polaron density, mass, and scattering rate. The cyclotron mass of 2D polarons was found to increase significantly with magnetic field B from 0.24 me at B = 2 T to 0.37 me at B = 7.5 T. A nonlinear cyclotron frequency with B was also observed for 3D polarons in ZnO. The findings are discussed in the context of polaron mass renormalization driven by the electron-LO-phonon and electron-acoustic phonon interactions.

AB - The cyclotron resonance of polarons in Zn1-xMgxO/ZnO heterostructures (with 0.15 < x < 0.22) was studied by terahertz time-domain spectroscopy. Low-temperature magnetoconductivity spectra of the 2D electron gas at the Zn1-xMgxO/ZnO interface determined the polaron density, mass, and scattering rate. The cyclotron mass of 2D polarons was found to increase significantly with magnetic field B from 0.24 me at B = 2 T to 0.37 me at B = 7.5 T. A nonlinear cyclotron frequency with B was also observed for 3D polarons in ZnO. The findings are discussed in the context of polaron mass renormalization driven by the electron-LO-phonon and electron-acoustic phonon interactions.

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Interfacial and bulk polaron masses in Zn_1-_xMg_xO/ZnO heterostructures examined by terahertz time-domain cyclotron spectroscopy

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