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桂林电子科技大学2018年《815固体物理》考研专业课真题试卷

桂林电子科技大学2018年《815固体物理》考研专业课真题试卷

桂林电子科技大学2018年考研专业课真题试卷

科目代码: 815 科目名称:固体物理

注意:答案必须全部写在考点提供的答题纸上,写在试题上无效;答案要标注题号,答题纸要填写姓名和考号,并标注页码与总页数;交卷时,将答题纸与试题一起装入原试卷袋,用我校提供的密封条密封并签名。

一、简要解释下列问题(每小题6分,共30分)

1. 第一布里渊区

2. 布洛赫定理

3. 德哈斯-范阿尔芬效应

4. 作为能带论基础的三个基本近似:绝热近似、单电子近似和周期场近似。

5. 费米面、费米能、费米速度。

二、(30分)已知某晶体中相邻原子之间的相互作用势可以表示为:

其中,,,都是大于零的常数。

(1)说明右式两项代表的物理意义并求出处于平衡状态时的原子间距。(2)证明此系统可以处于稳定平衡态的条件是。

(3)只考虑最近邻相互作用,写出由N个相同原子组成的该晶体的总相互作用能的表达式。

三、(30分)设有N个相同原子组成的一维原子链,原子间距为a,质量为m,

链长。

(1)在只考虑最近邻相互作用(待定力常数为)和简谐近似下,试证明其晶格振动波的色散关系为:

(2)根据周期性边界条件给出格波波矢的可能取值及有意义的取值范围。(3)推出其态密度的表达式并绘图表示。

四、(30分)二维简单正方晶格,晶格常数为,每个原胞有一个原子,每个原

子只有一个s态价电子,使用紧束缚近似,只计入近邻相互作用:

(1)求出s电子组成的s能带的函数。

第 1 页共 2 页

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