Juan D. Lejarreta is a professor at the Department of Applied Physics and teaches physics for engineers at the E.T.S.I.I. in the University of Salamanca. He was born in Bilbao (Spain) in 1956 and obtained his Ph.D. in Physics by University of Salamanca in 1996. His interest areas include the analysis and reduction of symmetries in physical systems, and its application in the obtention of the exact and computational solutions of 2D and 2D+1 dimensions problems in condensed matter including nonlinear interactions. He is also investigating in the physical characterization of several graphene nanostructures and its implementation in novel electronic nanodevices of interest.

**Email:** leja@usal.es

**Phone:** +34 923 40 80 80 Office: T2244

**ResearchID:** J. D. Lejarreta

Nonlinear Dyn (2017) 87:13–23 (2017)''

Angle dependent conductivity in graphene FET transistors

Solid-State Electronics 104, 47 (2015) (2015)''

Exact transmission coefficient with one and two barriers in graphene

Journal of Physics A: Mathematical and Theoretical 46, 155304 (20pp) (2013)''

Integrable 1+1 dimensional hierarchies arising from reduction of a non-isospectral problem in 2+1 dimensions

Appl. Mathematics. and Computation. 224, 311-324 (2013)''

Iterative symmetry search and reduction of a water wave model in 2 + 1 dimensions

(2013)''

Non-isospectral 1+1 hierarchies arising from a Camassa-Holm Hierarchy in 2+1 dimensions

Journal of Nonlinear Math. Physics, 18, 9-28 (2011)''

Transmission coefficients in monolayer graphene

Proceedings of the 10th conference on Computational and Mathematical Methods in Science and Engineering CMMSE2010, (Almería,. España) ,1132-1139, ISBN -978-84-613-5510-5 (2010)''

The symmetry group of the quantum harmonic oscillator in an electric field

Cent Eur. J. Phys, 6, 671-684 (2008)''

Intense laser interacting with a two level atom: WKB expressions for Dipole Transitions and Population Inversion.

Physics Letters, 293A, 1-9, (2002) (2002)''

Formalism and Examples of Squeezing and Dynamical Symmetries

Proceedings of the international workshop "Symmetries in Quantum Mechanics and Quantum Optics" , Burgos (Spain) Servicio de Publicaciones de la Universidad de Burgos. 97-108 (1999)''

The Floquet analysis and noninteger higher harmonics generation

Journal of Mathematical Physics 40, 1738-1755 (1999)''

The generalized harmonic oscillator and the infinite square well with a moving boundary

Journal of Physics A 32, 4749 (1999)''

The time-dependent canonical formalism: Generalized harmonic oscillator and the infinite square well with a moving boundary

Europhysics Letters 45, 6-12 (1999)''

Dynamical Symmetries, Cyclic and Periodic States

Journal of Physics A 31, 5507-5523 (1998)''

Miura Transformation between two Nonlinear Equations in (2+1)-Dimensions

Journal of Mathematical Physics 39, 2800-2807 (1998)''

Quantum Phases: Exact Solutions and Two Examples

Proceedings of the 5th International Conference on Squeezed States and Uncertainty Relations, Balatonfüred, Hungary, 27-31 May, 1997, (D. Han, J. Janszky, Y.S. Kim, and V.I. Man'ko, Eds.), NASA Proceedings, NASA/CP-1998-206855 (1998)''

Quantum Phases and the Degenerate Optical Parametric Oscillator

Quantum and Semiclassical Optics 9, L5-L11 (1997)''

Generalized Two-Mode Harmonic Oscillator: SO(3,2) Dynamical Group and Squeezed States

J. Phys. A: Math & Gen. 29, 7545-7560 (1996)''

Two Photon Interaction: SO(3,2) Symmetry and exact solutions

Int. Phys. Conf. Ser. 140, Section 9 201-204 IOP Publishing Ltd. (1995)''