TY - GEN
T1 - The relation between light absorption and luminescence in laser cooling of two-dimensional semiconductor systems
AU - Kwong, N. H.
AU - Rupper, G.
AU - Gu, B.
AU - Binder, R.
PY - 2007
Y1 - 2007
N2 - In efforts underway to achieve laser cooling of semiconductors, an electron-hole population is generated in the sample and maintained in a steady state. The analysis of light absorption by and luminescence from this population is basic to the understanding of feasibility and efficiency issues of the cooling process. It is commonly understood that, when this electron-hole plasma is in quasi-thermal equilibrium (equilibrium at a fixed density), the KMS (Kubo-Martin-Scliwinger) relation holds between its luminescence and absorption spectra: their ratio is proportional to the Bose distribution function characterized by the temperature and chemical potential of the plasma. The proportionality factor, which affects the total luminescence rate, may generally depend on the dimensionality and geometry of the system, In this Contribution, as a preliminary step to extend our theoretical analysis of semiconductor cooling to quantum well systems, we discuss the application of the KMS relation to their spectra. In particular, we derive and discuss the geometrical proportionality factor in the KMS relation forquantum wells and compare it to its counterpart for bulk semiconductors.
AB - In efforts underway to achieve laser cooling of semiconductors, an electron-hole population is generated in the sample and maintained in a steady state. The analysis of light absorption by and luminescence from this population is basic to the understanding of feasibility and efficiency issues of the cooling process. It is commonly understood that, when this electron-hole plasma is in quasi-thermal equilibrium (equilibrium at a fixed density), the KMS (Kubo-Martin-Scliwinger) relation holds between its luminescence and absorption spectra: their ratio is proportional to the Bose distribution function characterized by the temperature and chemical potential of the plasma. The proportionality factor, which affects the total luminescence rate, may generally depend on the dimensionality and geometry of the system, In this Contribution, as a preliminary step to extend our theoretical analysis of semiconductor cooling to quantum well systems, we discuss the application of the KMS relation to their spectra. In particular, we derive and discuss the geometrical proportionality factor in the KMS relation forquantum wells and compare it to its counterpart for bulk semiconductors.
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U2 - 10.1117/12.708536
DO - 10.1117/12.708536
M3 - Conference contribution
AN - SCOPUS:34248674925
SN - 0819465747
SN - 9780819465740
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Laser Cooling of Solids
T2 - Laser Cooling of Solids
Y2 - 24 January 2007 through 25 January 2007
ER -