Lasing threshold in traps for Bose-condensation of dipolar excitons

详细信息	查看全文 | 推荐本文 |

• 作者：Petr A. Kalinin^a ; ^{petr@kalinin.nnov.ru} ; Vitaly V. Kocharovsky^a ; ^b ; Vladimir V. Kocharovsky^a
• 关键词：A. Excitons ; D. Bose&ndash ; Einstein condensation ; D. Class D lasers ; D. Polariton modes
• 刊名：Solid State Communications
• 出版年：2012
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：June, 2012
• 卷：152
• 期：12
• 页码：1008-1011
• 文件大小：154 K

摘要

We consider exciton recombination lasing in heterostructure traps for Bose-Einstein condensation of dipolar excitons. We show that such structures suit well for class D lasers where cavity decay strongly exceeds polarization decay. We evaluate lasing threshold taking into account specific inhomogeneous broadening of the exciton spectral line owing to Bose-Einstein condensation phenomenon under quasi-equilibrium conditions.

It is found that narrowing of the exciton momentum distribution just before the condensation onset considerably lowers lasing threshold. At the same time, it is pointed out that a subsequent formation of condensate itself does not help lasing much. We conclude that it is possible to achieve lasing on polariton modes in nowadays experiments aimed on Bose-Einstein condensation of excitons.