%0 Journal Article %1 2006NatPh...2..620K %A Katsnelson, M. I. %A Novoselov, K. S. %A Geim, A. K. %D 2006 %J Nature Physics %K imported %P 620-625 %R 10.1038/nphys384 %T Chiral tunnelling and the Klein paradox in graphene %V 2 %X The so-called Klein paradox-unimpeded penetration of relativistic particles through high and wide potential barriers-is one of the most exotic and counterintuitive consequences of quantum electrodynamics. The phenomenon is discussed in many contexts in particle, nuclear and astro-physics but direct tests of the Klein paradox using elementary particles have so far proved impossible. Here we show that the effect can be tested in a conceptually simple condensed-matter experiment using electrostatic barriers in single- and bi-layer graphene. Owing to the chiral nature of their quasiparticles, quantum tunnelling in these materials becomes highly anisotropic, qualitatively different from the case of normal, non-relativistic electrons. Massless Dirac fermions in graphene allow a close realization of Klein's gedanken experiment, whereas massive chiral fermions in bilayer graphene offer an interesting complementary system that elucidates the basic physics involved.

@article{2006NatPh...2..620K, abstract = {The so-called Klein paradox-unimpeded penetration of relativistic particles through high and wide potential barriers-is one of the most exotic and counterintuitive consequences of quantum electrodynamics. The phenomenon is discussed in many contexts in particle, nuclear and astro-physics but direct tests of the Klein paradox using elementary particles have so far proved impossible. Here we show that the effect can be tested in a conceptually simple condensed-matter experiment using electrostatic barriers in single- and bi-layer graphene. Owing to the chiral nature of their quasiparticles, quantum tunnelling in these materials becomes highly anisotropic, qualitatively different from the case of normal, non-relativistic electrons. Massless Dirac fermions in graphene allow a close realization of Klein's gedanken experiment, whereas massive chiral fermions in bilayer graphene offer an interesting complementary system that elucidates the basic physics involved.}, added-at = {2011-03-12T05:59:39.000+0100}, adsnote = {Provided by the SAO/NASA Astrophysics Data System}, adsurl = {http://ads.nao.ac.jp/abs/2006NatPh...2..620K}, author = {{Katsnelson}, M. I. and {Novoselov}, K. S. and {Geim}, A. K.}, biburl = {https://www.bibsonomy.org/bibtex/27452484f22eaf0503a4d6c2235e3d105/corneliu}, doi = {10.1038/nphys384}, eprint = {arXiv:cond-mat/0604323}, file = {2006NatPh...2..620K.pdf:2006NatPh...2..620K.pdf:PDF}, interhash = {c376602aa7642f98b43629cfb82bfe58}, intrahash = {7452484f22eaf0503a4d6c2235e3d105}, journal = {Nature Physics}, keywords = {imported}, month = sep, note = {read}, pages = {620-625}, timestamp = {2011-03-12T05:59:44.000+0100}, title = {{Chiral tunnelling and the Klein paradox in graphene}}, volume = 2, year = 2006 }