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Coupling of the As A_{1g} phonon to magnetism in iron pnictides (2013)

N. A. García-Martínez, B. Valenzuela, S. Ciuchi, E. Cappelluti, M. J. Calderón, and E. Bascones

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-05

Description: Author(s): N. A. García-Martínez, B. Valenzuela, S. Ciuchi, E. Cappelluti, M. J. Calderón, and E. Bascones Charge, spin, and lattice degrees of freedom are strongly entangled in iron superconductors. A neat consequence of this entanglement is the behavior of the A 1 g As-phonon resonance in the different polarization symmetries of Raman spectroscopy when undergoing the magnetostructural transition. In this... [Phys. Rev. B 88, 165106] Published Fri Oct 04, 2013

Keywords: Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

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Anisotropic intrinsic spin relaxation in graphene due to flexural distortions (2013)

S. Fratini, D. Gosálbez-Martínez, P. Merodio Cámara, and J. Fernández-Rossier

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-21

Description: Author(s): S. Fratini, D. Gosálbez-Martínez, P. Merodio Cámara, and J. Fernández-Rossier We propose an intrinsic spin scattering mechanism in graphene originated by the interplay of atomic spin-orbit interaction and the local curvature induced by flexural distortions of the atomic lattice. Starting from a multiorbital tight-binding Hamiltonian with spin-orbit coupling considered nonpert... [Phys. Rev. B 88, 115426] Published Fri Sep 20, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Procedure to count atoms with trustworthy single-atom sensitivity (2013)

S. Van Aert, A. De Backer, G. T. Martinez, B. Goris, S. Bals, G. Van Tendeloo, and A. Rosenauer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-02-20

Description: Author(s): S. Van Aert, A. De Backer, G. T. Martinez, B. Goris, S. Bals, G. Van Tendeloo, and A. Rosenauer We report a method to reliably count the number of atoms from high-angle annular dark field scanning transmission electron microscopy images. A model-based analysis of the experimental images is used to measure scattering cross sections at the atomic level. The high sensitivity of these measurements... [Phys. Rev. B 87, 064107] Published Tue Feb 19, 2013

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Nodal effects in α-iron dislocation mobility in the presence of helium bubbles (2013)

N. Naveen Kumar, E. Martinez, B. K. Dutta, G. K. Dey, and A. Caro

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-02-14

Description: Author(s): N. Naveen Kumar, E. Martinez, B. K. Dutta, G. K. Dey, and A. Caro Dislocations and dislocation networks act as sinks for irradiation-induced point defects such as vacancies and interstitials, or impurities such as helium. Recently, it has been found that the intersection points of the screw dislocation network formed at twist grain boundaries in Au (experimental) ... [Phys. Rev. B 87, 054106] Published Wed Feb 13, 2013

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Generalized method for constructing the atomic coordinates of nanotube caps (2013)

M. Robinson, I. Suarez-Martinez, and N. A. Marks

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-04-25

Description: Author(s): M. Robinson, I. Suarez-Martinez, and N. A. Marks A practical numerical method for the rapid construction of nanotube caps is proposed. Founded upon the notion of lattice duality, the algorithm considers the face dual representation of a given nanotube which is used to solve an energy minimization problem analogous to The Thomson Problem . Not only ... [Phys. Rev. B 87, 155430] Published Wed Apr 24, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Charge disproportionation in RNiO_{3} (R= Tm, Yb) perovskites observed in situ by neutron diffraction and ^{57}Fe probe Mössbauer spectroscopy (2013)

J. A. Alonso, M. J. Martínez-Lope, I. A. Presniakov, A. V. Sobolev, V. S. Rusakov, A. M. Gapochka, G. Demazeau, and M. T. Fernández-Díaz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-05-18

Description: Author(s): J. A. Alonso, M. J. Martínez-Lope, I. A. Presniakov, A. V. Sobolev, V. S. Rusakov, A. M. Gapochka, G. Demazeau, and M. T. Fernández-Díaz An in-situ investigation from high-resolution neutron powder diffraction data on the structural evolution of TmNiO 3 and YbNiO 3 perovskites across the metal-insulator transition, with T MI = 596 K and 598 K, respectively, allowed the charge disproportionation effect that these perovskites experience u... [Phys. Rev. B 87, 184111] Published Fri May 17, 2013

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Mapping electronic reconstruction at the metal-insulator interface in LaVO_{3}/SrVO_{3} heterostructures (2013)

Haiyan Tan, Ricardo Egoavil, Armand Béché, Gerardo T. Martinez, Sandra Van Aert, Jo Verbeeck, Gustaaf Van Tendeloo, Hélène Rotella, Philippe Boullay, Alain Pautrat, and Wilfrid Prellier

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-22

Description: Author(s): Haiyan Tan, Ricardo Egoavil, Armand Béché, Gerardo T. Martinez, Sandra Van Aert, Jo Verbeeck, Gustaaf Van Tendeloo, Hélène Rotella, Philippe Boullay, Alain Pautrat, and Wilfrid Prellier A ( L a V O 3 ) 6 /( S r V O 3 ) 3 superlattice is studied with a combination of sub-Å resolved scanning transmission electron microscopy and monochromated electron energy-loss spectroscopy. The V oxidation state is mapped with atomic spatial resolution enabling us to investigate electronic reconstruction at the L ... [Phys. Rev. B 88, 155123] Published Mon Oct 21, 2013

Keywords: Electronic structure and strongly correlated systems

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Coherent emission of light using stacked gratings (2013)

Yongkang Gong, Xianliang Liu, Kang Li, Jungang Huang, J. J. Martinez, Daniel Rees-Whippey, Sara Carver, Leiran Wang, Wenfu Zhang, Tao Duan, and Nigel Copner

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-05-15

Description: Author(s): Yongkang Gong, Xianliang Liu, Kang Li, Jungang Huang, J. J. Martinez, Daniel Rees-Whippey, Sara Carver, Leiran Wang, Wenfu Zhang, Tao Duan, and Nigel Copner The possibility of temporally and spatially coherent thermal emission has been demonstrated utilizing stacked gratings. We demonstrate that the metallic grating with narrow air slit behaves like a homogeneous slab with large permittivity and small permeability and find that the interaction between t... [Phys. Rev. B 87, 205121] Published Tue May 14, 2013

Keywords: Electronic structure and strongly correlated systems

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Analysis of optomechanical coupling in two-dimensional square lattice phoxonic crystal slab cavities (2013)

Said El-Jallal, Mourad Oudich, Yan Pennec, Bahram Djafari-Rouhani, Vincent Laude, Jean-Charles Beugnot, Alejandro Martínez, José María Escalante, and Abdelkader Makhoute

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-11-08

Description: Author(s): Said El-Jallal, Mourad Oudich, Yan Pennec, Bahram Djafari-Rouhani, Vincent Laude, Jean-Charles Beugnot, Alejandro Martínez, José María Escalante, and Abdelkader Makhoute We theoretically investigate phonon-photon interaction in cavities created in a phoxonic crystal slab constituted by a two-dimensional (2D) square array of holes in a silicon membrane. The structure without defects provides 2D band gaps for both electromagnetic and elastic waves. We consider two typ... [Phys. Rev. B 88, 205410] Published Thu Nov 07, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Interaction-driven phases in the half-filled spinless honeycomb lattice from exact diagonalization (2013)

Noel A. García-Martínez, Adolfo G. Grushin, Titus Neupert, Belén Valenzuela, and Eduardo V. Castro

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-12-19

Description: Author(s): Noel A. García-Martínez, Adolfo G. Grushin, Titus Neupert, Belén Valenzuela, and Eduardo V. Castro We investigate the fate of interaction-driven phases in the half-filled honeycomb lattice for finite systems via exact diagonalization with nearest- and next-nearest-neighbor interactions. We find evidence for a charge density wave phase, a Kekulé bond order, and a sublattice charge-modulated phase ... [Phys. Rev. B 88, 245123] Published Wed Dec 18, 2013

Keywords: Electronic structure and strongly correlated systems

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