• 作者： 吳啟宗
• 作者服務機構： 國立交通大學應用數學系
• 中文摘要： 利用在高頻和強磁場皆適宜之方法，研究超聲波在非簡併壓電半導體（如N型銻化銦）內與磁場 B 成角度 θ 傳播時所產生之效應。導電子與超聲波之交互作用是藉形變位能與壓電耦合機構所引起。結果顯示磁場對於超聲波傳播方向之改變，將影響聲波吸收係數和聲速改變率。所以吸收係數和聲速改變率與磁場、聲頻、溫度、超聲波之傳播方向等均有關係。
• 英文摘要： Effects of ultrasonic waves propagating atan angle θ relative to the direction of a domagnetic field B in nondegenerate piezoelectricsemiconductors such as n-type InSb have beenstudied by using a quantum treatment which isvalid at high frequencies and in strong magneticfields. The interaction of conduction electronswith the ultrasonic waves is via deformation-potential and piezoelectric couplings. Resultsshow that variation of the direction of themagnetic field with respect to the direction ofpropagation of ultrasonic waves will affect theultrasonic absorption coefficient and change insound velocity. Therefore, the absorptioncoefficient and change in sound velocity dependstrongly on the do magnetic field, the soundfrequency, the temperature, and the direction ofthe propagation of ultrasonic waves relative tothat of the field.
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