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We present a theoretical study of dielectrophoretic (DEP) crossover spectrum of two polarizable particles under the action of a nonuniform AC electric field. For two approaching particles, the mutual polarization interaction yields a change…

Chemical Physics · Physics 2007-05-23 J. P. Huang , Mikko Karttunen , K. W. Yu , L. Dong

We develop a theoretical model for how organic molecules can control the electronic and transport properties of an underlying transistor channel to whose surface they are chemically bonded. The influence arises from a combination of…

Mesoscale and Nanoscale Physics · Physics 2015-05-13 Smitha Vasudevan , Neeti Kapur , Tao He , Matthew Neurock , James M. Tour , Avik W. Ghosh

Separation of the two mirror images of a chiral molecule, the enantiomers, is a historically complicated problem of major relevance for biological systems. Since chiral molecules are optically active, it has been speculated that strong…

Chemical Physics · Physics 2024-10-23 Rosario R. Riso , Matteo Castagnola , Enrico Ronca , Henrik Koch

The mechanisms of electrostatic interactions between two charged dielectric spheres inside a polarizable medium have been investigated, in terms of hypothetical effective dipoles that depict how the positive and negative charge in each…

Soft Condensed Matter · Physics 2025-02-06 Yanyu Duan , Zecheng Gan , Ho-Kei Chan

The development of new methodologies for the selective synthesis of individual enantiomers is still one of the major challenges in synthetic chemistry. Many biomolecules, and therefore many pharmaceutical compounds, are indeed chiral. While…

Chemical Physics · Physics 2023-08-14 Rosario R. Riso , Enrico Ronca , Henrik Koch

Two-photon excitation is an attractive means for controlling chemistry in both space and time. Isoenergetic one- and two-photon excitations (OPE and TPE) in non-centrosymmetric molecules are often assumed to reach the same excited state…

Enantioselective photochemistry provides access to unique molecular structures and functions, with deep implications for fundamental science and industrial applications. Current methods for highly enantioselective photochemistry critically…

Chemical Physics · Physics 2025-03-07 Andrés Ordóñez , Patricia Vindel-Zandbergen , David Ayuso

The azimuthal asymmetry of direct photons originating from primary hard scatterings between partons is calculated. This can be accounted for by the inclusion of the color dipole orientation, which is sensitive to the rapid variation of the…

High Energy Physics - Phenomenology · Physics 2011-08-31 B. Z. Kopeliovich , A. H. Rezaeian , Ivan Schmidt

We study theoretically the simultaneous, photo-induced two-particle excitations of strongly correlated systems on the basis of the Hubbard model. Under certain conditions specified in this work, the corre- sponding transition probability is…

Strongly Correlated Electrons · Physics 2015-05-18 B. D. Napitu , J. Berakdar

Chiral nanophotonic structures have garnered considerable interest in recent years due to their potential to enhance the efficacy of chirality-sensitive biomolecular detection. Designing metaplatforms to enhance chiroptical signals under…

Electron-positron pair production in dynamically assisted two-color electric fields is investigated for various polarizations. Momentum spectrum and number density of the created pairs are examined carefully, in particular, the effects of…

Quantum Physics · Physics 2019-06-10 Obulkasim Olugh , Zi-Liang Li , Bai-Song Xie

We examine spin-resolved photoionization of randomly oriented chiral molecules via circularly polarized light, and revisit earlier predictions of Cherepkov (J. Phys. B: Atom. Mol. Phys. 16, 1543, 1983). We will show that the dynamical…

Production of electron-positron pairs from vacuum in strong bichromatic electric fields, oscillating in time with a fundamental frequency and its second harmonic, is studied. Strong-field processes occuring in such field configurations are…

Atomic Physics · Physics 2020-04-15 J. Braß , R. Milbradt , S. Villalba-Chávez , G. G. Paulus , C. Müller

Electromagnetic fields with complex spatial variation routinely arise in Nature. We study the response of a small molecule to monochromatic fields of arbitrary three-dimensional geometry. First, we consider the allowed configurations of the…

Optics · Physics 2010-11-23 Nan Yang , Adam E. Cohen

While the interaction potential between two dipoles residing in a single plane is repulsive, in a system of two vertically adjacent layers of dipoles it changes from repulsive interaction in the long range to attractive interaction in the…

Quantum Gases · Physics 2016-06-29 Kobi Cohen , Maxim Khodas , Boris Laikhtman , Paulo V. Santos , Ronen Rapaport

We consider two-color heteronuclear photoassociation of atoms into dipolar molecules in the J=1 electro-vibrational ground state, where a free-ground laser couples atoms directly to the ground state and a free-bound laser couples the atoms…

Quantum Gases · Physics 2009-11-19 Matt Mackie , Catherine DeBrosse

We present a consistent analysis of linear spectroscopy for arrays of nearest neighbor dipole-coupled two-level molecules that reveals distinct signatures of weak and strong coupling regimes separated for infinite size arrays by a quantum…

Quantum Physics · Physics 2015-06-16 A. A. Kocherzhenko , J. Dawlaty , B. P. Abolins , F. Herrera , D. B. Abraham , K. B. Whaley

A general analytical approach to the study of electromagnetic resonances of metasurfaces consisting of meta-atoms with anisotropic electric and magnetic dipole polarizabilities and irradiated with obliquely incident light is developed in…

Here we proposed the valley selective excitations via a two-color (\ensuremath{\omega} + \ensuremath{2\omega}) laser field, made by superimposing two linearly polarized pulses at frequencies \ensuremath{\omega} and \ensuremath{2\omega}. We…

Optics · Physics 2023-06-21 Arqum Hashmi , Shunsuke Yamada , Kazuhiro Yabana , Tomohito Otobe

Using an empirical pseudopotential description of electron states and an adiabatic bond charge model for phonon states in bulk silicon, we theoretically investigate two-photon indirect optical injection of carriers and spins and two-color…

Materials Science · Physics 2011-12-07 J. L. Cheng , J. Rioux , J. E. Sipe