%0 Journal Article %1 Park2011 %A Park, Sunghun %A Sim, H. S. %D 2011 %K graphene klein tunneling %T Klein Tunneling and Berry Phase $\pi$ in Bilayer Graphene with Band Gap %U http://arxiv.org/abs/1103.3331 %X Klein tunneling in gapless bilayer graphene, perfect reflection of electrons injecting normal to a pn junction, is expected to disappear in the presence of energy band gap, which is induced by the external gates forming the junction and hence difficult to avoid in experiments. We theoretically show that the Klein effect still exists in gapped bilayer graphene, provided that the gaps in the n and p regions are balanced such that the polarization of electron pseudospin has the same normal component to the bilayer plane in the regions. We attribute the Klein effect to Berry phase $\pi$ (rather than the conventional value 2 $\pi$ of bilayer graphene) and to electron-hole and time-reversal symmetries. We discuss how to observe the effect in experiments.

@article{Park2011, abstract = { Klein tunneling in gapless bilayer graphene, perfect reflection of electrons injecting normal to a pn junction, is expected to disappear in the presence of energy band gap, which is induced by the external gates forming the junction and hence difficult to avoid in experiments. We theoretically show that the Klein effect still exists in gapped bilayer graphene, provided that the gaps in the n and p regions are balanced such that the polarization of electron pseudospin has the same normal component to the bilayer plane in the regions. We attribute the Klein effect to Berry phase $\pi$ (rather than the conventional value 2 $\pi$ of bilayer graphene) and to electron-hole and time-reversal symmetries. We discuss how to observe the effect in experiments. }, added-at = {2011-03-18T08:20:36.000+0100}, author = {Park, Sunghun and Sim, H. S.}, biburl = {https://www.bibsonomy.org/bibtex/2e0952568ec477f2411a8f698f38df5d9/corneliu}, description = {Klein Tunneling and Berry Phase $\pi$ in Bilayer Graphene with Band Gap}, interhash = {cf7b815ccc6df5f4114b3a8295f296cc}, intrahash = {e0952568ec477f2411a8f698f38df5d9}, keywords = {graphene klein tunneling}, note = {cite arxiv:1103.3331 Comment: 4 pages, 4 figures}, timestamp = {2011-03-18T08:20:36.000+0100}, title = {Klein Tunneling and Berry Phase $\pi$ in Bilayer Graphene with Band Gap}, url = {http://arxiv.org/abs/1103.3331}, year = 2011 }