The performance of an organic functional device can be effectively improved through external field manipulation. In this study, we experimentally demonstrate the optical polarization manipulation of the photocurrent or photovoltage in organic solar cells. Through switching the incident light from a linearly polarized light to a circularly polarized one, we find a pronounced change in the photocurrent, which is not observable in normal inorganic cells. There are two competing hypotheses for the primary process underlying the circular polarizationdependent phenomena in organic materials, one involving the inverse Faraday effect (IFE) and the other a direct photon spin–electron spin interaction. By waymore »
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The interplay of space and time symmetries, ferroic properties, chirality and notions of reciprocity determines many of the technologically important properties of materials such as optical diode effect, e.g., in polar ferromagnet FeZnMo _{3}O _{8}. Here, we illustrate these concepts, including the nonreciprocal directional dichroism, through a number of practical examples. In particular, the conditions for nonreciprocity of ferrorotational order are discussed and the possible use of linear optical gyration is suggested as a way to detect ferrorotational domains. In addition, we provide the means to achieve hightemperature optical diode effect and elucidate multiferroic behaviors as a result of helicalmore »

We explore a variant of the Φ ^{6} model originally proposed in Phys. Rev.D 12 (1975) 1606 as a prototypical, socalled, “bag” model in which domain walls play the role of quarks within hadrons. We examine the steady state of the model, namely an apparent bound state of two kink structures. We explore its linearization, and we find that, as a function of a parameter controlling the curvature of the potential, an effectively arbitrary number of internal modes may arise in the point spectrum of the linearization about the domain wall profile. We explore some of the key characteristics ofmore »

Despite intense investigations and many accepted viewpoints on theory and experiment, the coherent and incoherent carrier transport in organic semiconductors remains an unsettled topic due to the strong electronphonon coupling. Based on the tightbinding SuSchriefferHeeger (SSH) model combined with a nonadiabatic dynamics method, we study the effect of phasebreaking on polaron transport by introducing a group of phasebreaking factors into πelectron wavefunctions in organic conjugated polymers. Two approaches are applied: the modification of the transfer integral and the phasebreaking addition to the wavefunction. Within the former, it is found that a single site phasebreaking can trap a polaron. However, withmore »Cited by 1Full Text Available

This paper is meant as an accessible introduction to/tutorial on the analytical construction and numerical simulation of a class of nonstandard solitary waves termed peakompactons. We present that these peaked compactly supported waves arise as solutions to nonlinear evolution equations from a hierarchy of nonlinearly dispersive Korteweg–de Vriestype models. Peakompactons, like the nowwellknown compactons and unlike the soliton solutions of the Korteweg–de Vries equation, have finite support, i.e., they are of finite wavelength. However, unlike compactons, peakompactons are also peaked, i.e., a higher spatial derivative suffers a jump discontinuity at the wave’s crest. Here, we construct such solutions exactly bymore »

Here, we invesmore »Cited by 1Full Text Available

Here in this paper, we discuss the behavior of solitary wave solutions of the nonlinear Schrödinger equation (NLSE) as they interact with complex potentials, using a fourparameter variational approximation based on a dissipation functional formulation of the dynamics. We concentrate on spatially periodic potentials with the periods of the real and imaginary part being either the same or different. Our results for the time evolution of the collective coordinates of our variational ansatz are in good agreement with direct numerical simulation of the NLSE. We compare our method with a collective coordinate approach of Kominis and give examples where themore »Cited by 2Full Text Available

A noncommuting measurement transfers, via the apparatus, information encoded in a system's state to the external “observer.” Classical measurements determine properties of physical objects. In the quantum realm, the very same notion restricts the recording process to orthogonal states as only those are distinguishable by measurements. Thus, even a possibility to describe physical reality by means of nonHermitian operators should volens nolens be excluded as their eigenstates are not orthogonal. We show that nonHermitian operators with real spectra can be treated within the standard framework of quantum mechanics. Further, we propose a quantum canonical transformation that maps Hermitian systems ontomore »Cited by 2Full Text Available
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