折叠石墨烯中的强能斯特-艾廷斯豪森效应
Strong Nernst-Ettingshausen effect in folded graphene
摘要：
我们研究了在横向磁场$\f{B}(\f{r})=B(x)\f{e}_z$的影响下石墨烯中的电子输运，其中渐近性为$B(x\to\pm\infty)=\pm B_0$，例如，这可以通过在恒定磁场中折叠的石墨烯片来实现。通过求解有效的狄拉克方程，我们发现了具有有限能隙的鲁棒模式，它们沿着粒子和空穴以相反方向移动的褶皱传播。用入射光子激发这些粒子-空穴对将产生几乎完美的电荷分离，从而产生强的磁热电（能斯特-艾廷斯豪森）或磁光电效应-即使在室温下。
英文摘要：
We study electronic transport in graphene under the influence of a transversal magnetic field $\f{B}(\f{r})=B(x)\f{e}_z$ with the asymptotics $B(x\to\pm\infty)=\pm B_0$, which could be realized via a folded graphene sheet in a constant magnetic field, for example. By solving the effective Dirac equation, we find robust modes with a finite energy gap which propagate along the fold -- where particles and holes move in opposite directions. Exciting these particle-hole pairs with incident photons would then generate a nearly perfect charge separation and thus a strong magneto-thermoelectric (Nernst-Ettingshausen) or magneto-photoelectric effect -- even at room temperature.
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