Lukose Vinu, Shankar R, Baskaran G
The Institute of Mathematical Sciences, C.I.T. Campus, Chennai 600 113, India.
Phys Rev Lett. 2007 Mar 16;98(11):116802. doi: 10.1103/PhysRevLett.98.116802. Epub 2007 Mar 15.
A new effect in graphene in the presence of crossed uniform electric and magnetic fields is predicted. Landau levels are shown to be modified in an unexpected fashion by the electric field, leading to a collapse of the spectrum, when the value of electric to magnetic field ratio exceeds a certain critical value. Our theoretical results, strikingly different from the standard 2D electron gas, are explained using a "Lorentz boost," and as an "instability of a relativistic quantum field vacuum." It is a remarkable case of emergent relativistic type phenomena in nonrelativistic graphene. We also discuss few possible experimental consequence.
预测了在交叉均匀电场和磁场存在下石墨烯中的一种新效应。当电场与磁场的比值超过某个临界值时，朗道能级会以一种意想不到的方式被电场改变，导致能谱崩塌。我们的理论结果与标准二维电子气显著不同，用“洛伦兹变换”以及作为“相对论量子场真空的不稳定性”来解释。这是非相对论性石墨烯中出现的相对论类型现象的一个显著例子。我们还讨论了一些可能的实验结果。
