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 January 15th, 2014Congratulations to Patrick and Allen for their paper, “Photoresponse of an Electrically Tunable Ambipolar Graphene Infrared Thermocouple,” being published in Nano Letters. Photoresponse of an Electrically Tunable Ambipolar Graphene Infrared Thermocouple
December 28th, 2013Congratulations to Andrea, Javier and Ben on their paper, “Tunable symmetry breaking and helical edge transport in a graphene quantum spin Hall state,” being published in Nature. MIT news press release “Graphene can host exotic new quantum electronic states at its edges” Link to paper December 13th, 2013“To three groups that have independently made the first measurement of Hofstadter’s butterfly in a solid-state system. One group is led by Philip Kim of Columbia University, another is led by Roman Gorbachev of the University of Manchester and another by Pablo Jarillo-Herrero and Ray Ashoori at the Massachusetts Institute of Technology.” – Physics World. Link to the Physics World article here Read the original publication at Science August 21st, 2013Congratulations to Britt, Hugh and Yafang for their paper being published in Nano Letters! Read the paper at: http://pubs.acs.org/doi/abs/10.1021/nl401916s June 18th, 2013We are proud to annouce that graduate students Qiong Ma and Valla Fatemi passed their Part III General exam on Condensed Matter Physics yesterday. Kudos to them! May 21st, 2013Congratulations to Ben, Javier and Andrea for the publication of their paper: “Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure” in Science Magazine! April 26th, 2013Thiti succesfully defended his Thesis “From Hopping to Ballistic Transport in Graphene-Based Electronic Devices” today! Congratulations to him for being the first Jarillo Lab group member to defend! March 28th, 2013Congratulations to Pablo for being awarded an ONR Young Investigator Award for “Quantum Transport and Optoelectronics in Atomically Layered Materials.” The MIT news article can be found here. February 5th, 2013Congratulations to graduate student Thiti Taychatanapat for his paper being accepted to Nature Physics! A link to the preprint can be found here: Electrically tunable transverse magnetic focusing in graphene Electrons in a periodic lattice can propagate without scattering for macroscopic distances despite the presence of the non-uniform Coulomb potential due to the nuclei. Such ballistic motion of electrons allows the use of a transverse magnetic field to focus electrons. This phenomenon, known as transverse magnetic focusing (TMF), has been used to study the Fermi surface of metals and semiconductor heterostructures, as well as to investigate Andreev reflection, spin-orbit interaction, and to detect composite fermions. Here we report on the experimental observation of transverse magnetic focusing in high mobility mono-, bi-, and tri-layer graphene devices. The ability to tune the graphene carrier density enables us for the first time to investigate TMF continuously from the hole to the electron regime and analyze the resulting focusing fan. Moreover, by applying a transverse electric field to tri-layer graphene, we use TMF as a ballistic electron spectroscopy method to investigate controlled changes in the electronic structure of a material. Finally, we demonstrate that TMF survives in graphene up to 300 K, by far the highest temperature reported for any system, opening the door to novel room temperature applications based on electron-optics. January 8th, 2013Congratulations to Postdoc Leonardo Campos for getting a faculty position at Federal University of Minas Gerais (UFMG) in Brazil! After 3 years in the group Leonardo will be moving on to start his own lab back in Brazil. All of us in the group wish him the best of luck in future research endeavors! |
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