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δ掺杂Be受主GaAs/AlAs多量子阱的拉曼光谱

Keywords: 拉曼光谱,多量子阱,打靶法,受主能级

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Abstract:

通过显微拉曼(Raman)光谱仪,对一系列δ掺杂GaAs/AlAs量子阱中浅受主铍(Be)原子能级间跃迁进行了研究.实验样品是利用分子束外延技术生长在GaAs衬底(100)面上的GaAs/AlAs多量子阱,阱宽范围从30到200,并在阱中央进行了受主Be原子的δ掺杂.在4.2K液氦温度下,对样品进行了Raman光谱测量,并与光致发光(PL)光谱进行了对比,清楚地观测到了受主原子从基态能级1S3/2(Γ6)到第一激发态能级2S3/2(Γ6)之间的跃迁.根据量子力学中的变分原理和打靶法算法,计算了量子阱中类氢受主Be原子1s到2s能级间跃迁能量,并和实验结果进行了比较.计算结果表明,受主1s到2s能级间跃迁的能量随量子阱宽度减小而单调增加,并且与实验结果符合较好.

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