Results 91 to 100 of about 24,867 (278)

Van Hove Excitons and High-T$_c$ Superconductivity: VIIIC Dynamic Jahn-Teller Effects vs Spin-Orbit Coupling in the LTO Phase of La$_{2-x}$Sr$_x$CuO$_4$

, 1993
The possible role of the van Hove singularity (vHs) in stabilizing the low-temperature orthorhombic (LTO) phase transition in La$_{2-x}$\-Sr$_x$\-CuO$_ 4$ (LSCO) is discussed.
Affleck, Axe, Balseiro, Barisic, Barisic, Berry, Bersuker, Bonesteel, Bussman-Holder, Chaves, Chui, Coffey, Cohen, Cracknell, Delacrétaz, Elliott, Elliott, Emery, Englman, Englman, Eskes, Falicov, Feder, Friedel, Gehring, Grant, Halperin, Ham, Harrison, Hsu, Höck, Jones, Kaplan, Kasowski, Kittel, Koike, koster, Kotliar, Labbé, Labbé, Labbé, Lee, Maeno, Markiewicz, Markiewicz, Markiewicz, Markiewicz, Markiewicz, Markiewicz, Markiewicz, Markiewicz, Markiewicz, Markiewicz, McLachlan, Müller, Nagaev, Newns, Novakovic, O'Brien, Pickett, Potts, Pouget, Pytte, Pytte, Pytte, R.S. Markiewicz, Sato, Schulz, Sera, Shekhtman, Slater, Suzuki, Tagaki, Thio, Wheatley, Wu   +75 more
core   +1 more source

Mixed‐Metal Promotion in a Manganese‐Molybdenum Oxynitride as Catalyst to Integrate C─C and C─N Coupling Reactions for the Direct Synthesis of Acetonitrile from Syngas and Ammonia

Advanced Materials, EarlyView.
Transition metal oxy/carbo‐nitrides show great promise as catalysts for sustainable processes. A Mn‐Mo mixed‐metal oxynitride attains remarkable performance for the direct synthesis of acetonitrile, an important commodity chemical, via sequential C─N and C─C coupling from syngas (C1) and ammonia (N1) feedstocks.
M. Elena Martínez‐Monje, Wilson Henao, Tania Rodenas, Patricia Concepción, Virginia Pérez Dieste, Alexander Missyul, Giovanni Agostini, Gonzalo Prieto   +7 more
wiley   +1 more source

Phase-locking in Multi-Frequency Brillouin Oscillator via Four Wave Mixing

, 2014
Stimulated Brillouin scattering (SBS) and Kerr-nonlinear four wave-mixing (FWM) are among the most important and widely studied nonlinear effects in optical fibres.
Boyd, Büttner, Eggleton, Ferdous, Hill, Hill, Pant, Slusher, Stolen, Tang, V.   +10 more
core   +1 more source

Chiral Acoustic Phonon and Conservation of Pseudoangular Momentum in α‐Quartz

Advanced Materials, EarlyView.
Chiral acoustic phonons in α‐quartz are probed via Brillouin light scattering, exploiting the photon's helicity and the crystal's handedness. The interaction obeys a selection rule arising from pseudoangular momentum conservation, enabling direct optical access to phonon chirality in nonsymmorphic crystals.
Changsoo Kim, In‐Kook Hwang, Kyoung‐Woong Moon, Kyongmo An, Kyung‐Jin Lee, Jae‐Hyeon Ko, Byong‐Guk Park, Kwang‐Yong Choi, Chanyong Hwang   +8 more
wiley   +1 more source

Photoexcited transients in disordered semiconductors: Quantum coherence at very short to intermediate times

, 2002
We study theoretically electron transients in semiconductor alloys excited by light pulses shorter than 100 femtoseconds and tuned above the absorption edge during and shortly after the pulse, when disorder scattering is dominant.
A. Kalvová, A. Kalvová, A. Kalvová, A.-B. Chen, B. Velický, B. Velický, B. Velický, B. Velický, B. Velický, D. Langreth, D. Semkat, J. Luttinger, K.C. Hass, L. Banyai, L.V. Keldysh, P. Danielewicz, P. Danielewicz, P. Gartner, P. Lipavský, V.M. Galitskii, W. Kohn   +20 more
core   +1 more source

Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics

Advanced Materials, EarlyView.
The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades, Pedro Hidalgo, David Maestre, Ruth Martínez‐Casado, Emilio Nogales, Beatriz Rodríguez, G. Cristian Vásquez, Bianchi Méndez   +7 more
wiley   +1 more source

Surface Brillouin Scattering in Disordered Optical Fibers With Transverse Anderson Localization Guiding Mechanism for Evaluation of Longitudinal Structural Fluctuations

IEEE Photonics Journal, 2018
We numerically investigate the surface Brillouin scattering (surface-BS) in a transverse Anderson localization (TAL) guiding silica glass-air disordered optical fiber (DOF) with random air-holes.
Sheng Liang, Yongxin Zhang, Xin Wang, Xinzhi Sheng, Shuqin Lou, Bo Lin, Mingli Dong, Lianqing Zhu   +7 more
doaj   +1 more source

Hidden Order Behaviour in URu2Si2 (A Critical Review of the Status of Hidden Order in 2014)

, 2014
Throughout the past three decades the hidden order (HO) problem in URu$_2$Si$_2$ has remained a "hot topic" in the physics of strongly correlated electron systems with well over 600 publications related to this subject.
Mydosh, John A., Oppeneer, Peter M.
core   +1 more source

Spin‐Split Edge States in Metal‐Supported Graphene Nanoislands Obtained by CVD

Advanced Materials, EarlyView.
Combining STM measurements and ab‐initio calculations, we show that zig‐zag edges in graphene nanoislands grown on Ni(111) by CVD retrieve their spin‐polarized edge states after intercalation of a few monolayers of Au. ABSTRACT Spin‐split states localized on zigzag edges have been predicted for different free‐standing graphene nanostructures.
Michele Gastaldo, Masoud Mansouri, Carlos Garcia‐Fernandez, Daniel Sánchez‐Portal, Aran Garcia‐Lekue, Gustavo Ceballos, Aitor Mugarza   +6 more
wiley   +1 more source

Examining electron-boson coupling using time-resolved spectroscopy

, 2013
Nonequilibrium pump-probe time domain spectroscopies can become an important tool to disentangle degrees of freedom whose coupling leads to broad structures in the frequency domain.
,, /LBNL, Berkeley, /SIMES, Stanford, /SIMES, Stanford /North Dakota U. /Northern Illinois U., /SIMES, Stanford /Stanford U., Geballe Lab., /SIMES, Stanford /Stanford U., Phys. Dept. /Stanford U., Appl. Phys. Dept. /Stanford U., Geballe Lab., Devereaux, Thomas P., Freericks, James K., Kemper, Alexander F., Moritz, Brian, Sentef, Michael, Shen, Zhi-Xun, U., /Georgetown   +12 more
core   +3 more sources