| Laser-field-induced magnon amplification in a magnetic semiconductor quantum well under an external magnetic field |
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| 作者单位： | Peng Feng
Physics Department，University of Science and Technology Beijing，Beijing 100083，China |
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| 摘 要： | The laser-field induced magnon amplification in a magnetic semiconductor quantum well under an external magnetic field was discussed, it is shown that when the laser frequency is near to the electron cyclotron frequency, no matter how weaker the laser field is, the magnon amplification always occurs. In case of fixed laser frequency, the optical absorption of magnons obeys the definite selection rule to the laser field strength. The rate of change of magnon occupation is calculated, and the amplification condition is given.
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Laser-field-induced magnon amplification in a magnetic semiconductor quantum well under an external magnetic field |
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| Authors: | Peng Feng |
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| Abstract: | The laser-field induced magnon amplification in a magnetic semiconductor quantum well under an external magnetic field was discussed, it is shown that when the laser frequency is near to the electron cyclotron frequency, no matter how weaker the laser field is, the magnon amplification always occurs. In case of fixed laser frequency, the optical absorption of magnons obeys the definite selection rule to the laser field strength. The rate of change of magnon occupation is calculated, and the amplification condition is given. |
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| Keywords: | magnon amplification magnetic semiconductor quantum well laser field |
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