In this work, we combine a Ginzburg–Landau model for a ferroelastic transition with the theory of micromagnetism to study the magnetostructural behavior leading to multicaloric effects in ferromagnetic shape memory alloys. We analyze the ferroelastic transition under different conditions of temperature, stress and magnetic field and establish the corresponding phase diagram. On the one hand, our results show that the proper combination of both fields may be used to reduce the transition hysteresis and thus improve the reversibility of the related elastocaloric effects, superelasticity and stressmediated magnetocaloric effects. On the other hand, the stressfree magnetic fielddriven and thermally driven magnetostructuralmore »
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Here, we present a calculation of the effective geometryinduced quantum potential for the carriers in graphene shaped as a helicoidal nanoribbon. In this geometry the twist of the nanoribbon plays the role of an effective transverse electric field in graphene and this is reminiscent of the Hall effect. But, this effective electric field has a different sign for the two isospin states and translates into a mechanism to separate the two chiral species on the opposing rims of the nanoribbon. Finally, isospin transitions are expected with the emission or absorption of microwave radiation which could be adjusted to be inmore »Cited by 5Full Text Available

Quantum walks often provide telling insights about the structure of the system on which they are performed. Here, in PTsymmetric and lossy dimer lattices, the topological properties of the band structure manifest themselves in the quantization of the mean displacement of such a walker. We investigate the fragile aspects of a topological transition in these two dimer models. We find that the transition is sensitive to the initial state of the walker on the Bloch sphere, and the resultant mean displacement has a robust topological component and a quasiclassical component. In PT symmetric dimer lattices, we also show that themore »

Spin waves in magnetic nanowires can be bound by a local bending of the wire. The eigenfrequency of a truly local magnon mode is determined by the curvature: a general analytical expression is established for any infinitesimally weak localized curvature of the wire. In conclusion, the interaction of the local mode with spin waves, propagating through the bend, results in scattering features, which is well confirmed by spinlattice simulations.

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 »

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 »Cited by 3Full Text Available

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 »
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