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Room temperature electron effective mass parameters of m\u22a5*=(0.205\u00b10.013)\u2009m0 and m\u2225*=(0.204\u00b10.016)\u2009m0 for polarization perpendicular and parallel to the c-axis, respectively, were determined. The free electron concentration was obtained as (1.7\u2009\u00b1\u20090.2)\u2009\u00d7\u20091019\u2009cm\u22123. Within our uncertainty limits, we detect no anisotropy for the electron effective mass parameter and we estimate the upper limit of the possible effective mass anisotropy as 7%. We discuss the influence of conduction band nonparabolicity on the electron effective mass parameter as a function of In content. The effective mass parameter is consistent with a linear interpolation scheme between the conduction band mass parameters in GaN and InN when the strong nonparabolicity in InN is included. The In0.33Ga0.67N electron mobility parameter was found to be anisotropic, supporting previous experimental findings for wurtzite-structure GaN, InN, and AlxGa1\u2212xN epitaxial layers with c-plane growth orientation.<\/jats:p>","DOI":"10.1063\/1.5018247","type":"journal-article","created":{"date-parts":[[2018,2,20]],"date-time":"2018-02-20T16:33:16Z","timestamp":1519144396000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":9,"title":["Electron effective mass in In0.33Ga0.67N determined by mid-infrared optical Hall effect"],"prefix":"10.1063","volume":"112","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6363-4962","authenticated-orcid":false,"given":"Nerijus","family":"Armakavicius","sequence":"first","affiliation":[{"name":"Terahertz Materials Analysis Center, Department of Physics, Chemistry and Biology IFM, Link\u00f6ping University 1 , SE-58183 Link\u00f6ping, Sweden"}]},{"given":"Vallery","family":"Stanishev","sequence":"additional","affiliation":[{"name":"Terahertz Materials Analysis Center, Department of Physics, Chemistry and Biology IFM, Link\u00f6ping University 1 , SE-58183 Link\u00f6ping, Sweden"}]},{"given":"Sean","family":"Knight","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering and Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln 2 , 68588 Lincoln, Nebraska, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8827-7404","authenticated-orcid":false,"given":"Philipp","family":"K\u00fchne","sequence":"additional","affiliation":[{"name":"Terahertz Materials Analysis Center, Department of Physics, Chemistry and Biology IFM, Link\u00f6ping University 1 , SE-58183 Link\u00f6ping, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6238-663X","authenticated-orcid":false,"given":"Mathias","family":"Schubert","sequence":"additional","affiliation":[{"name":"Terahertz Materials Analysis Center, Department of Physics, Chemistry and Biology IFM, Link\u00f6ping University 1 , SE-58183 Link\u00f6ping, Sweden"},{"name":"Department of Electrical and Computer Engineering and Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln 2 , 68588 Lincoln, Nebraska, USA"},{"name":"Leibniz Institute for Polymer Research 3 , 01069 Dresden, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8112-7411","authenticated-orcid":false,"given":"Vanya","family":"Darakchieva","sequence":"additional","affiliation":[{"name":"Terahertz Materials Analysis Center, Department of Physics, Chemistry and Biology IFM, Link\u00f6ping University 1 , SE-58183 Link\u00f6ping, Sweden"}]}],"member":"317","published-online":{"date-parts":[[2018,2,20]]},"reference":[{"key":"2023061721425982700_c1","doi-asserted-by":"publisher","first-page":"011101","DOI":"10.1063\/1.3155798","volume":"106","year":"2009","journal-title":"J. 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