Non-equilibrium Green's function calculation for GaN-based terahertz-quantum cascade laser structures
We theoretically investigated GaN-based resonant phonon terahertz-quantum cascade laser (QCL) structures for possible high-temperature operation by using the non-equilibrium Green's function method. It was found that the GaN-based THz-QCL structures do not necessarily have a gain sufficient for...
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| Veröffentlicht in: | Journal of applied physics 2012-04, Vol.111 (8), p.083105-083105-4 |
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| container_end_page | 083105-4 |
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| container_issue | 8 |
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| container_title | Journal of applied physics |
| container_volume | 111 |
| creator | Yasuda, H. Kubis, T. Hosako, I. Hirakawa, K. |
| description | We theoretically investigated GaN-based resonant phonon terahertz-quantum cascade laser (QCL) structures for possible high-temperature operation by using the non-equilibrium Green's function method. It was found that the GaN-based THz-QCL structures do not necessarily have a gain sufficient for lasing, even though the thermal backfilling and the thermally activated phonon scattering are effectively suppressed. The main reason for this is the broadening of the subband levels caused by a very strong interaction between electrons and longitudinal optical (LO) phonons in GaN. |
| doi_str_mv | 10.1063/1.4704389 |
| format | Article |
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It was found that the GaN-based THz-QCL structures do not necessarily have a gain sufficient for lasing, even though the thermal backfilling and the thermally activated phonon scattering are effectively suppressed. The main reason for this is the broadening of the subband levels caused by a very strong interaction between electrons and longitudinal optical (LO) phonons in GaN.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.4704389</identifier><identifier>CODEN: JAPIAU</identifier><language>eng</language><publisher>American Institute of Physics</publisher><subject>Backfilling ; Cascade lasers ; Gain ; Gallium nitrides ; Green's functions ; Lasing ; Mathematical analysis ; Phonons</subject><ispartof>Journal of applied physics, 2012-04, Vol.111 (8), p.083105-083105-4</ispartof><rights>2012 American Institute of Physics</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c383t-681d769b9235309f772e4384413afe046d05a6fd7ba13c97d1805ee27c4567853</citedby><cites>FETCH-LOGICAL-c383t-681d769b9235309f772e4384413afe046d05a6fd7ba13c97d1805ee27c4567853</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/jap/article-lookup/doi/10.1063/1.4704389$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>314,780,784,794,1559,4512,27924,27925,76384,76390</link.rule.ids></links><search><creatorcontrib>Yasuda, H.</creatorcontrib><creatorcontrib>Kubis, T.</creatorcontrib><creatorcontrib>Hosako, I.</creatorcontrib><creatorcontrib>Hirakawa, K.</creatorcontrib><title>Non-equilibrium Green's function calculation for GaN-based terahertz-quantum cascade laser structures</title><title>Journal of applied physics</title><description>We theoretically investigated GaN-based resonant phonon terahertz-quantum cascade laser (QCL) structures for possible high-temperature operation by using the non-equilibrium Green's function method. It was found that the GaN-based THz-QCL structures do not necessarily have a gain sufficient for lasing, even though the thermal backfilling and the thermally activated phonon scattering are effectively suppressed. The main reason for this is the broadening of the subband levels caused by a very strong interaction between electrons and longitudinal optical (LO) phonons in GaN.</description><subject>Backfilling</subject><subject>Cascade lasers</subject><subject>Gain</subject><subject>Gallium nitrides</subject><subject>Green's functions</subject><subject>Lasing</subject><subject>Mathematical analysis</subject><subject>Phonons</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNp1kD1PwzAQhi0EEqUw8A-yAYOLL05ie0FCFRSkqiwwW45zFkFp0vpjgF9P-jGwMN1J97wnvQ8h18BmwCp-D7NCsIJLdUImwKSioizZKZkwlgOVSqhzchHCF2MAkqsJwdXQU9ymtmtr36Z1tvCI_U3IXOptbIc-s6azqTP73Q0-W5gVrU3AJovozSf6-EO3yfRxDFsTrGkw68a7z0L0ycbkMVySM2e6gFfHOSUfz0_v8xe6fFu8zh-X1HLJI60kNKJStcp5yZlyQuQ4dikK4MYhK6qGlaZyjagNcKtEA5KViLmwRVkJWfIpuT383fhhmzBEvW6Dxa4zPQ4paOA5z2GsXozo3QG1fgjBo9Mb366N_9bA9E6lBn1UObIPBzbYNu5N_A-PPvUfn3rnk_8C8ct7vw</recordid><startdate>20120415</startdate><enddate>20120415</enddate><creator>Yasuda, H.</creator><creator>Kubis, T.</creator><creator>Hosako, I.</creator><creator>Hirakawa, K.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20120415</creationdate><title>Non-equilibrium Green's function calculation for GaN-based terahertz-quantum cascade laser structures</title><author>Yasuda, H. ; Kubis, T. ; Hosako, I. ; Hirakawa, K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c383t-681d769b9235309f772e4384413afe046d05a6fd7ba13c97d1805ee27c4567853</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Backfilling</topic><topic>Cascade lasers</topic><topic>Gain</topic><topic>Gallium nitrides</topic><topic>Green's functions</topic><topic>Lasing</topic><topic>Mathematical analysis</topic><topic>Phonons</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yasuda, H.</creatorcontrib><creatorcontrib>Kubis, T.</creatorcontrib><creatorcontrib>Hosako, I.</creatorcontrib><creatorcontrib>Hirakawa, K.</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yasuda, H.</au><au>Kubis, T.</au><au>Hosako, I.</au><au>Hirakawa, K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Non-equilibrium Green's function calculation for GaN-based terahertz-quantum cascade laser structures</atitle><jtitle>Journal of applied physics</jtitle><date>2012-04-15</date><risdate>2012</risdate><volume>111</volume><issue>8</issue><spage>083105</spage><epage>083105-4</epage><pages>083105-083105-4</pages><issn>0021-8979</issn><eissn>1089-7550</eissn><coden>JAPIAU</coden><abstract>We theoretically investigated GaN-based resonant phonon terahertz-quantum cascade laser (QCL) structures for possible high-temperature operation by using the non-equilibrium Green's function method. It was found that the GaN-based THz-QCL structures do not necessarily have a gain sufficient for lasing, even though the thermal backfilling and the thermally activated phonon scattering are effectively suppressed. The main reason for this is the broadening of the subband levels caused by a very strong interaction between electrons and longitudinal optical (LO) phonons in GaN.</abstract><pub>American Institute of Physics</pub><doi>10.1063/1.4704389</doi></addata></record> |
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| ispartof | Journal of applied physics, 2012-04, Vol.111 (8), p.083105-083105-4 |
| issn | 0021-8979 1089-7550 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1323211184 |
| source | AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection |
| subjects | Backfilling Cascade lasers Gain Gallium nitrides Green's functions Lasing Mathematical analysis Phonons |
| title | Non-equilibrium Green's function calculation for GaN-based terahertz-quantum cascade laser structures |
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