arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.09549cond-mat.mtrl-sci
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砷化硼的能带结构和载流子有效质量:准粒子和自旋轨道耦合修正的影响

Band structure and carrier effective masses of boron arsenide: effects of quasiparticle and spin-orbit coupling corrections

Kyle Bushick, Kelsey Mengle, Nocona Sanders, Emmanouil Kioupakis

摘要:

我们确定的基本电子和光学性质的高热导率的III-V族半导体砷化硼(BAs)使用密度泛函和多体微扰理论,包括准粒子和自旋轨道耦合修正。我们发现,基本的带隙是间接的值为2.049 eV,而最小的直接带隙的值为4.135 eV。我们计算了载流子的有效质量,并报告了空穴比电子更小的值,这表明空穴迁移率更高,p型掺杂更容易。静态介电常数和高频介电常数之间的小差异表明BA仅为弱离子。我们还观察到,介电函数的虚部表现出强吸收峰,这对应于能带结构中的平行带。我们估计的激子结合能为43毫电子伏表明,激子是相对稳定的,在室温下对热解离。我们的工作提供了理论见解的基本电子性质的BA指导实验表征和设备的应用。

英文摘要:

We determine the fundamental electronic and optical properties of the high-thermal-conductivity III-V semiconductor boron arsenide (BAs) using density functional and many body perturbation theory including quasiparticle and spin-orbit coupling corrections. We find that the fundamental band gap is indirect with a value of 2.049 eV, while the minimum direct gap has a value of 4.135 eV. We calculate the carrier effective masses and report smaller values for the holes than the electrons, indicating higher hole mobility and easier p-type doping. The small difference between the static and high frequency dielectric constants indicates that BAs is only weakly ionic. We also observe that the imaginary part of the dielectric function exhibits a strong absorption peak, which corresponds to parallel bands in the band structure. Our estimated exciton binding energy of 43 meV indicates that excitons are relatively stable against thermal dissociation at room temperature. Our work provides theoretical insights on the fundamental electronic properties of BAs to guide experimental characterization and device applications.

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