面内磁场作用下准二维载流子的顺磁-反磁涨落
Purely orbital diamagnetic to paramagnetic fluctuation of quasi two-dimensional carriers under in-plane magnetic field
摘要：
一个外部磁场，$H$，平行于准二维系统的修改定量和定性的状态密度。使用自洽的数值方法，我们研究这如何影响熵，$S$，自由能，$F$，和磁化，$M$，不同的片状载流子浓度，$N_s$。作为原型系统，我们采用III-V双量子阱。我们发现，虽然$M$主要是在相反的方向上的$H$，系统是不是线性的。令人惊讶的是，$\partial M / \partial H$在负值和正值之间摆动，即，我们预测了一个完全的轨道反磁顺磁波动。与理想的de Haas-van Alphen效应（即，在垂直磁场下的对应现象）相比，该现象是重要的。
英文摘要：
An external magnetic field, $H$, applied parallel to a quasi two-dimensional system modifies quantitatively and qualitatively the density of states. Using a self-consistent numerical approach, we study how this affects the entropy, $S$, the free energy, $F$, and the magnetization, $M$, for different sheet carrier concentrations, $N_s$. As a prototype system we employ III-V double quantum wells. We find that although $M$ is mainly in the opposite direction of $H$, the system is not linear. Surprisingly $\partial M / \partial H$ swings between negative and positive values, i.e., we predict an entirely orbital diamagnetic to paramagnetic fluctuation. This phenomenon is important compared to the ideal de Haas-van Alphen effect i.e. the corresponding phenomenon under perpendicular magnetic field.
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