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- Yafis Barlas, T Pereg-Barnea, Marco Polini, Reza Asgari, A H MacDonald
- Physical review letters
- 2007

Graphene is described at low energy by a massless Dirac equation whose eigenstates have definite chirality. We show that the tendency of Coulomb interactions in lightly doped graphene to favor states with larger net chirality leads to suppressed spin and charge susceptibilities. Our conclusions are based on an evaluation of graphene's exchange and… (More)

- Omri Bahat-Treidel, Or Peleg, Mark Grobman, Nadav Shapira, Mordechai Segev, T Pereg-Barnea
- Physical review letters
- 2010

We study the scattering of waves off a potential step in deformed honeycomb lattices. For deformations below a critical value, perfect Klein tunneling is obtained; i.e., a potential step transmits waves at normal incidence with nonresonant unit-transmission probability. Beyond the critical deformation a gap forms in the spectrum, and a potential step… (More)

- Doron L. Bergman, Tamar Pereg-Barnea
- Materials
- 2011

Recent experiments on heterostructures composed of two or more films of cuprate superconductors of different oxygen doping levels have shown a remarkable Tc enhancement (up to 50%) relative to single compound films. We provide a simple explanation of the enhancement which arises naturally from a collection of experimental works. We show that the enhancement… (More)

- J Jung, T Pereg-Barnea, A H Macdonald
- Physical review letters
- 2009

A graphene nanoribbon with zigzag edges has a gapped magnetic ground state with an antiferromagnetic interedge superexchange interaction. We present a theory based on asymptotic properties of the Dirac-model ribbon wave function which predicts W-2 and W-1 ribbon-width dependencies for the superexchange interaction strength and the charge gap, respectively.… (More)

- Aaron Farrell, T Pereg-Barnea
- Physical review letters
- 2015

Here we provide a picture of transport in quantum well heterostructures with a periodic driving field in terms of a probabilistic occupation of the topologically protected edge states in the system. This is done by generalizing methods from the field of photon-assisted tunneling. We show that the time dependent field dresses the underlying Hamiltonian of… (More)

Alexandra Junck,1,2 Kun W. Kim,1 Doron L. Bergman,1 T. Pereg-Barnea,1,3 and Gil Refael1 1Department of Physics, California Institute of Technology, 1200 E. California Blvd, MC114-36, Pasadena, California 91125, USA 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany 3Department of Physics,… (More)

- E Berg, N H Lindner, T Pereg-Barnea
- Physical review letters
- 2011

We examine a contact between a superconductor whose order parameter changes sign across the Brillioun zone, and an ordinary, uniform-sign superconductor. Within a Ginzburg-Landau-type model, we find that if the barrier between the two superconductors is not too high, the frustration of the Josephson coupling between different portions of the Fermi surface… (More)

The goal of this paper is to provide an intuitive and useful tool for analyzing the impurity bound state problem. We develop a semiclassical approach and apply it to an impurity in two dimensional systems with parabolic or Dirac like bands. Our method consists of reducing a higher dimensional problem into a sum of one dimensional ones using the two… (More)

- T. Pereg-Barnea
- 2012

We explore the possibility of inducing a topological insulator phase in a honeycomb lattice lacking spin-orbit interaction using a metallic (or Fermi gas) environment. The lattice and the metallic environment interact through a density-density interaction without particle tunneling, and integrating out the metallic environment produces a honeycomb sheet… (More)

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