LETTERS 20.Milton Pereira,.Ir,Mlinar,V.,Peeters,E.M.Vasilopoulos,P.Confined states and Fundamentals of Nanoelectronics).A.R.acknowledges a Foreign Postdoc Fellowship from the Polish hapaowdm858T585inah.praa dirocti Science Foundation (FNP)and support by Correspondence and requests for materials should be addressed to C.W.LB. 21.Silvestrov.P.G.Efetov.K.B.Quantum dots in graphene.Phys.Rev.Lett.98,016802(2007). Competing financial interests Acknowledgements The authors declare that they have no competing financial interests. CommyMare e Nerk Reprints and permission information is available online at http://npg nature.com/reprintsandpermissions/ nature physics I VOL 3 I MARCH 2007 I www.nature.com/naturephysics 175 @2007 Nature Publishing GroupLETTERS 20. Milton Pereira, J. Jr, Mlinar, V., Peeters, F. M. & Vasilopoulos, P. Confined states and direction-dependent transmission in graphene quantum wells. Preprint at <http://arxiv.org/abs/cond-mat/0606558> (2006). 21. Silvestrov, P. G. & Efetov, K. B. Quantum dots in graphene. Phys. Rev. Lett. 98, 016802 (2007). Acknowledgements This research was supported by the Dutch Science Foundation NWO/FOM and by the European Community’s Marie Curie Research Training Network (contract MRTN-CT-2003-504574, Fundamentals of Nanoelectronics). A.R. acknowledges a Foreign Postdoc Fellowship from the Polish Science Foundation (FNP) and support by the Polish Ministry of Science (Grant No. 1 P03B 001 29). Correspondence and requests for materials should be addressed to C.W.J.B. Competing financial interests The authors declare that they have no competing financial interests. Reprints and permission information is available online at http://npg.nature.com/reprintsandpermissions/ nature physics VOL 3 MARCH 2007 www.nature.com/naturephysics 175 Untitled-1 4 13/2/07, 12:36:00 pm