Terahertz magneto-optical spectroscopy of a two-dimensional hole gas
Two-dimensional hole gases (2DHGs) have attracted recent attention for their unique quantum physics and potential applications in areas including spintronics and quantum computing. However, their properties remain relatively unexplored, motivating the use of different techniques to study them. We us...
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Veröffentlicht in: | Applied physics letters 2015-01, Vol.106 (3) |
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creator | Kamaraju, N. Pan, W. Ekenberg, U. Gvozdić, D. M. Boubanga-Tombet, S. Upadhya, P. C. Reno, J. Taylor, A. J. Prasankumar, R. P. |
description | Two-dimensional hole gases (2DHGs) have attracted recent attention for their unique quantum physics and potential applications in areas including spintronics and quantum computing. However, their properties remain relatively unexplored, motivating the use of different techniques to study them. We used terahertz magneto-optical spectroscopy to investigate the cyclotron resonance frequency in a high mobility 2DHG, revealing a nonlinear dependence on the applied magnetic field. This is shown to be due to the complex non-parabolic valence band structure of the 2DHG, as verified by multiband Landau level calculations. We also find that impurity scattering dominates cyclotron resonance decay in the 2DHG, in contrast with the dominance of superradiant damping in two-dimensional electron gases. Our results shed light on the properties of 2DHGs, motivating further studies of these unique 2D nanosystems. |
doi_str_mv | 10.1063/1.4906282 |
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M. ; Boubanga-Tombet, S. ; Upadhya, P. C. ; Reno, J. ; Taylor, A. J. ; Prasankumar, R. P.</creator><creatorcontrib>Kamaraju, N. ; Pan, W. ; Ekenberg, U. ; Gvozdić, D. M. ; Boubanga-Tombet, S. ; Upadhya, P. C. ; Reno, J. ; Taylor, A. J. ; Prasankumar, R. P. ; Sandia National Lab. (SNL-NM), Albuquerque, NM (United States) ; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)</creatorcontrib><description>Two-dimensional hole gases (2DHGs) have attracted recent attention for their unique quantum physics and potential applications in areas including spintronics and quantum computing. However, their properties remain relatively unexplored, motivating the use of different techniques to study them. We used terahertz magneto-optical spectroscopy to investigate the cyclotron resonance frequency in a high mobility 2DHG, revealing a nonlinear dependence on the applied magnetic field. This is shown to be due to the complex non-parabolic valence band structure of the 2DHG, as verified by multiband Landau level calculations. We also find that impurity scattering dominates cyclotron resonance decay in the 2DHG, in contrast with the dominance of superradiant damping in two-dimensional electron gases. Our results shed light on the properties of 2DHGs, motivating further studies of these unique 2D nanosystems.</description><identifier>ISSN: 0003-6951</identifier><identifier>EISSN: 1077-3118</identifier><identifier>DOI: 10.1063/1.4906282</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Applied physics ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; Cyclotron resonance ; Damping ; Dependence ; effective mass ; electron gas ; Electron states at surfaces and interfaces ; Landau levels ; magnetic fields ; Magnetic resonance ; Magneto-Optical THz spectroscopy ; magnetooptical effects ; MATERIALS SCIENCE ; PARTICLE ACCELERATORS ; Quantum computing ; Quantum theory ; Quantum wells ; Resonance scattering ; Spectrum analysis ; Spintronics ; Valence band</subject><ispartof>Applied physics letters, 2015-01, Vol.106 (3)</ispartof><rights>2015 AIP Publishing LLC.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c350t-25ffddf49b1917bdccd3fb4ac9a60c7839c69e1eb4c32764cde7f088b3df67d43</citedby><cites>FETCH-LOGICAL-c350t-25ffddf49b1917bdccd3fb4ac9a60c7839c69e1eb4c32764cde7f088b3df67d43</cites><orcidid>0000-0002-0424-9554 ; 0000000204249554</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27915,27916</link.rule.ids><backlink>$$Uhttps://www.osti.gov/servlets/purl/1224046$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Kamaraju, N.</creatorcontrib><creatorcontrib>Pan, W.</creatorcontrib><creatorcontrib>Ekenberg, U.</creatorcontrib><creatorcontrib>Gvozdić, D. 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We used terahertz magneto-optical spectroscopy to investigate the cyclotron resonance frequency in a high mobility 2DHG, revealing a nonlinear dependence on the applied magnetic field. This is shown to be due to the complex non-parabolic valence band structure of the 2DHG, as verified by multiband Landau level calculations. We also find that impurity scattering dominates cyclotron resonance decay in the 2DHG, in contrast with the dominance of superradiant damping in two-dimensional electron gases. Our results shed light on the properties of 2DHGs, motivating further studies of these unique 2D nanosystems.</description><subject>Applied physics</subject><subject>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</subject><subject>Cyclotron resonance</subject><subject>Damping</subject><subject>Dependence</subject><subject>effective mass</subject><subject>electron gas</subject><subject>Electron states at surfaces and interfaces</subject><subject>Landau levels</subject><subject>magnetic fields</subject><subject>Magnetic resonance</subject><subject>Magneto-Optical THz spectroscopy</subject><subject>magnetooptical effects</subject><subject>MATERIALS SCIENCE</subject><subject>PARTICLE ACCELERATORS</subject><subject>Quantum computing</subject><subject>Quantum theory</subject><subject>Quantum wells</subject><subject>Resonance scattering</subject><subject>Spectrum analysis</subject><subject>Spintronics</subject><subject>Valence band</subject><issn>0003-6951</issn><issn>1077-3118</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNot0E1LAzEQBuAgCtbqwX-w6MnD1nxtsjlK_YSCl3oO2UnSbmk3a5Ii9dcbaU_DwMPwzovQLcEzggV7JDOusKAtPUMTgqWsGSHtOZpgjFktVEMu0VVKm7I2lLEJel66aNYu5t9qZ1aDy6EOY-7BbKs0OsgxJAjjoQq-MlX-CbXtd25IfRiKWIetq1YmXaMLb7bJ3ZzmFH29vizn7_Xi8-1j_rSogTU417Tx3lrPVUcUkZ0FsMx33IAyAoNsmQKhHHEdB0al4GCd9LhtO2a9kJazKbo73g0p9zpBnx2sIQxDCaoJpRxzUdD9EY0xfO9dynoT9rHETZoSyhWXhLdFPRwVlA9TdF6Psd-ZeNAE6_8mNdGnJtkftOJlXw</recordid><startdate>20150119</startdate><enddate>20150119</enddate><creator>Kamaraju, N.</creator><creator>Pan, W.</creator><creator>Ekenberg, U.</creator><creator>Gvozdić, D. 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subjects | Applied physics CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Cyclotron resonance Damping Dependence effective mass electron gas Electron states at surfaces and interfaces Landau levels magnetic fields Magnetic resonance Magneto-Optical THz spectroscopy magnetooptical effects MATERIALS SCIENCE PARTICLE ACCELERATORS Quantum computing Quantum theory Quantum wells Resonance scattering Spectrum analysis Spintronics Valence band |
title | Terahertz magneto-optical spectroscopy of a two-dimensional hole gas |
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