Conveners
Quantum Materials and Quantum Technologies (Posters)
- Eduardo Castro (Centro de Física das Universidades do Minho e Porto, Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal)
- Pedro Ribeiro
- Joao Seixas (LIP Laboratorio de Instrumentacao e Fisica Experimental de Part)
Description
Quantum Materials and Quantum Technologies (Posters)
Significant efforts are being made to develop nanoscale electronic devices capable of emulating the dynamics of natural synapses to be integrated into neuromorphic circuits. Furthermore, to couple different neuronal populations via such artificial synapses bears great potential for therapeutic strategies focused on the monitoring and control of neuronal electrical activity. Such hybrid...
In order to substitute lead zirconate-titanate (PZT) based materials, due to its poisonous nature, some promising piezoelectric and friendly environment compounds are attracting growing attention, namely KxNa(1-x)NbO3 [1]. For the case of x=0.5, K0.5Na0.5NbO3 (KNN), the high-temperature cubic symmetry changes to a non-symmetric ferroelectric tetragonal structure at T3=700 K, becoming...
Hybrid materials based on ionic liquids (ILs) and polymers represent an emerging and interesting approach for an increasing number of applications, including sensors and actuators [1], as it represents a versatile way to produce particle free multifunctional materials with reduced environmental impact.
In this work, transparent piezoionic hybrid materials based on a thermoplastic elastomer...
As gluons, the force carriers of strong interactions, have color charge; the gluonic field is squeezed in space-time due to the self interaction and forms a flux tube in the vacuum; this is in contrast to the electromagnetic field spreading out in space. The dominant behavior of the flux tube is string-like, hence, it can be modeled with a thin relativistic string. The quantization of the...
The transfer of energy from semiconductor Quantum Dots (QDs) to Graphene in hybrid structures provides a rich environment to explore excitation dynamics in heterogeneous hybrid systems The photo-physical properties of QDs can be predictably fine-tuned by size selection, and Graphene can also be doped, with the aim of producing well-defined conditions for photoexcitation and energy transfer....
Spintronics has seen remarkable progress in the last decades. By combining well known concepts like Giant and Tunneling magnetoresistance with spin torques and control of domain walls, developments are foreseen in data storage [1] and logic, with new devices like the magnetoelectric spin-orbit MESO logic device [2]. New materials and nanostructures have also allowed several breakthroughs, from...
The dynamics of electrons in graphene can be described by a two-dimensional (2D) Dirac equation. Graphene is a two dimensional material embedded in three dimensions and is assumed to define a 2D flat surface. However, one expects deviations from flatland. Structural corrugations and ripples, have been observed in suspended graphene, and furthermore, atomistic simulations have shown that...
We present an ab-initio study performed by means of Density Functional Theory (DFT), group-subgroup symmetry analysis and lattice dynamics to probe the properties of the octahedral distortions, which occur during the structural phase transitions [1]. We mainly focus our study on the Sr3Hf2O7 (SHO) system, which is characterized by a high-temperature I4/mmm (S.G. 139) centrosymmetric structure...
Naturally layered perovskites have been studied in the designing of novel functional materials, ranging from superconductors to multiferroics, including the recently discovered hybrid improper ferroelectrics, to materials that exhibit negative thermal expansion [1,2]. Particularly, the Ruddlesden-Popper family with general formula CaO(CaMnO3)n has gained considerable interest, where the...
Spatial soliton is the wavepacket, which can propagate in nonlinear media without losing its shape due to the perfect balance between the dispersion and the nonlinearity. In this poster we consider solitons as special solutions of nonlinear Schrödinger equation. In its turn nonlinear Schrödinger equation describes various physical systems and objects like matter waves in Bose-Einstein...
In multiferroic systems, the coupling between electric and magnetic properties gives birth to new tactics to conceive novel technological architectures. The mechanism of ferroelectricity is crucial to materials with high magnetoelectric coupling. As a result, the discovery of hybrid improper ferroelectric (HIF) materials opened new routes for multiferroics design. The Ruddlesden-Popper (RP)...
In this work, we study the semiclassical dynamics of non-Hermitian quantum systems in
phase space. The non-Hermitian semiclassical dynamics of Gaussian coherent states is
described by a system of equations for the motion of the center and of the metric associated
with the wave packet, which we call the intrinsic geometry of the state [1,2] . The inclusion of a
non-Hermitian part leads to...
A proposal to study topological models beyond the standard topological classification and that exhibit breakdown of Lorentz invariance is presented. The focus of the investigation relies on their anisotropic quantum critical behavior. We study anisotropic effects on three-dimensional ($3$D) topological models, computing their anisotropic correlation length critical exponent $\nu$ obtained from...
Semiconductor quantum dots (QDs) are considered ideal building blocks to produce materials with specific photonic and spectroscopic properties. The possibility of controlling their properties such as size and doping during preparation facilitates the fine tuning of their optical properties such as absorption and emission spectra. The optical properties of QDs are affected by their environment...
Topological phases of matter have been used as a fertile realm of intensive discussions about fermionic fractionalization. In this work, we study the effects of anisotropic superconducting correlations in the fermionic fractionalization on the topological phases. We consider a hybrid version of the SSH and Kitaev models with an anisotropic superconducting order parameter to investigate the...
