18 results about "Phonon" patented technology

A quantum device includes: a solid-state material; a plurality of qubits on or in the solid-state material, each of the qubits comprising at least two quantum dots; and, a quantum phononic link (QPL) localized on or in the solid-state material, the QPL configured to guide phonons between a pair of qubits of the plurality of qubits to quantum-mechanically couple the pair of qubits, the pair of qubits spaced-apart by a qubit-separation distance that is longer than a direct-tunneling distance of the qubits and is at least about 10 nm. The device is particularly useful for quantum computing.

The invention discloses a hydrogen-based superconducting material Na2GaCuH6 with a double perovskite structure under normal pressure and a preparation method of the hydrogen-based superconducting material Na2GaCuH6. The material has an Fm-3m space group, the lattice constant is calculated and predicted through the first principle, and the material has the superconducting transition temperature of 42.04 K under the normal pressure condition. The material is composed of four common elements of Na, Ga, Cu and H, and the cost is low; the double perovskite structure is stable in thermodynamics and dynamics under normal pressure; the electro-acoustic coupling constant lambda is approximately equal to 0.98, and medium-intensity electro-acoustic coupling is achieved. Compared with an existing high-voltage hydride superconductor, the material can work without high-voltage equipment, and the preparation and application cost is greatly reduced; compared with a traditional normal-pressure superconductor, the superconductor has a higher Tc value. The material can be applied to the fields of low-temperature superconducting devices, superconducting magnets, quantum computing and the like, and has important scientific research value and application prospect.

The application discloses a kind of dispersion type fuel's thermal neutron scattering cross section calculation method and related device, belong to reactor material reaction cross section calculation technical field;The method first constructs the supercell of dispersion type fuel, calculates the Hellmann-Feynman force between each atom of supercell;And according to Hellmann-Feynman force, calculate phonon state density, mean square displacement matrix, dispersion relation and polarization vector;For the thermal neutron scattering law data calculation of fuel material, it can improve the accuracy of thermal neutron scattering law calculation, and then the theoretical value of thermal neutron scattering cross section is calculated;Finally, the actual experimental measurement value is compared with the aforementioned thermal neutron scattering cross section theoretical value, and the input parameters of thermal neutron scattering calculation are corrected according to the error of the two, and then the dispersion type fuel thermal neutron scattering cross section library with higher accuracy is obtained again by the corrected input parameters, and the calculation result is more accurate compared with the prior art.

The invention relates to a method and a system for automatically calculating Gibbs free energy of a material under different temperature and pressure conditions and constructing a phase diagram. The invention provides a method and a system for automatically calculating Gibbs free energy of a material and constructing a phase diagram. First principle calculation, phonon free energy calculation and hot electron free energy calculation are integrated into a unified automatic platform, so that the calculation efficiency is remarkably improved, and manual intervention is reduced. According to the system, firstly, static self-consistent energy is obtained through calculation according to a first principle, phonon free energy is calculated in combination with a quasi-harmonic approximation method, and hot electron free energy is obtained through electron state density analysis. On the basis, the compatibility among different calculation modules is ensured by adopting an automatic unit conversion and data preprocessing module. The system fits free energy-volume data through a three-order Birch-Murnaghan state equation, and supports adaptive encryption sampling so as to accurately capture phase change and free energy fluctuation under specific temperature and pressure conditions. Finally, the system automatically draws a temperature-pressure phase diagram, and an accurate basis is provided for predicting the thermodynamic stability of the material.

The invention provides a magnetic material surface temperature gradient generation method based on laser regulation and control, and relates to the field of data processing. According to the method, optical absorption, electron energy relaxation, phonon thermal conductivity and magnetic anisotropy parameters of a magnetic material are obtained, modeling is carried out in a three-dimensional space according to a silicon-based substrate, a cobalt layer and a platinum layer, and a cross-scale photo-thermal-magnetic full-coupling model is constructed. The method comprises the following steps: generating a laser coding tensor through light intensity, wavelength and phase parameters of a laser space modulation array, driving a model to solve in a simulation environment, generating temperature gradient evolution data and an implicit field quantity, and constructing a temperature gradient control database. After target temperature gradient distribution is set, a depth prediction model is used for outputting a temperature gradient evolution sequence, sensitivity distribution is calculated through the model, the optimal laser coding tensor is determined, finally verification and application to a laser array are carried out, and temperature distribution consistent with the target temperature gradient is achieved. By implementing the technical scheme, the temperature gradient on the surface of the magnetic material is convenient to generate.

A system for generating photon emission from atomic nuclei includes a device for generating phonons, and a condensed matter medium comprising atomic nuclei. The phonons interact with the atomic nuclei and affect nuclear states of some of the atomic nuclei by transferring energy to the nuclei and causing the nuclei to emit photons. The condensed matter medium includes excited Fe-57* nuclei and ground state Fe-57 nuclei, and the device for generating phonons comprises one of laser irradiation, electric current, diffusion of solutes in solid solutions, or particle beam bombardment.

The invention discloses a soft rock softening analysis method for a tunnel crossing unfavorable geological section, and relates to the technical field of tunnel engineering, and the method comprises the steps: collecting vortex light phase interference data according to a rock mass pore abnormal region coordinate set, calculating a moisture coupling coefficient, and generating a rock mass softening boundary coordinate set; performing space registration on the rock mass pore abnormal region coordinate set and the rock mass softening boundary coordinate set to generate a rock mass pore-moisture content incidence matrix, inputting the rock mass pore-moisture content incidence matrix into a near-field kinetic model to calculate the variation fracture energy release rate density, and generating a high-risk region coordinate set; according to porosity data in the coordinate set of the high-risk area, a grouting viscosity parameter is obtained, targeted grouting is executed, meanwhile, a pore closing phonon entanglement signal is monitored, and a quantum-depth verification index is generated; through quantum entanglement and Riemannian manifold modeling technologies, multi-dimensional and nonlinear correlation modeling between rock mass pore structure evolution and water-containing state change is realized.

To provide quantum sensors.SOLUTION: In one form of the present disclosure, a quantum sensor comprises a quantum device. The quantum device comprises gallium nitride (GaN) with a color center with a zero-phonon line (ZPL) between about 900 nanometers (nm) and about 990 nm. The GaN can be doped with silicon (Si) and have low carbon (C) and oxygen (O) impurity densities. In one example, the quantum device is GaN doped with about 1016 Si atoms per cm3, and having less than about 8×1015 C atoms per cm3 and less than about 6×1015 O atoms per cm3, and a Ga vacancy density less than about 1016 vacancies per cm3.SELECTED DRAWING: Figure 1

The invention provides an organic room temperature phosphorescent aggregate pressure response luminescence performance simulation method and system, and the method comprises the steps: firstly obtaining an accurate crystalline structure and a thin film structure, and then carrying out simulation pressurization on the crystalline structure and the thin film structure; obtaining the molecular configuration and the accumulation mode after pressurization, and monitoring the change of the aggregate form in real time; geometric structures, electronic structures and vibration frequency information of a ground state and an excited state are obtained by adopting a QM / MM method, and interaction such as non-adiabatic coupling, electro-acoustic sub-coupling and spin-orbit coupling is explored; and finally, acquiring attenuation rate parameters of a molecular excited state under an aggregate structure by using a TVCF method, obtaining information such as an emission spectrum, luminescence lifetime and luminescence efficiency, analyzing a dynamic process of the excited state, elaborating the influence of different pressurization types on an energy release process of the molecular excited state, and revealing an internal physical mechanism and a dynamic evolution process of pressure response.

The present application belongs to the technical field of micro-nano scale heat transfer simulation, and discloses a micro-nano scale heat transfer simulation method and system of a heterogeneous structure, comprising: obtaining material microcosmic phonon characteristic parameters through first principle calculation, constructing a defect scattering model in combination with the Massieu criterion, establishing an interface scattering boundary condition, and incorporating multiple key influencing factors into a unified phonon Boltzmann transport equation solving system, without relying on empirical thermal conductivity and interface thermal resistance parameters, so that local temperature distribution, heat flux density distribution, interface thermal conductivity, interface thermal resistance and other macro heat transfer parameters of the heterogeneous structure can be accurately obtained, and the accuracy, engineering applicability and cross-scene transferability of micro-nano scale heat transfer simulation are improved, and the problems of temperature rise abnormality and performance drift of a device caused by heat accumulation are effectively avoided.

The application discloses a phonon transport property calculation model, system and method based on wave-particle duality, which comprises a normal mode analysis module, a phonon wavelet transform module and a thermal conductivity calculation module, and unifies the particle nature and wave nature of phonons in a thermal conductivity prediction framework, wherein the normal mode analysis module is used for projecting atomic scale dynamic evolution information to a phonon mode space to obtain mode-resolved space-time evolution data; the phonon wavelet transform module is used for wavelet transforming the mode-resolved space-time evolution data to quantitatively characterize the coherent time and coherent length of phonons; and the thermal conductivity calculation module is used for simultaneously calculating the contribution of phonon particle nature lifetime and wave nature coherent time to thermal conductivity based on the mode-resolved space-time evolution data, the coherent time and the coherent length, thereby providing a phonon transport image closer to physical reality and greatly improving the research and development efficiency.

The present application relates to a kind of material thermodynamic parameter calculation method considering thermal expansion and phonon reorganization.The temperature-dependent effective potential (TDEP) method is used to non-perturbatively calculate phonon reorganization, independently scale asymmetric equivalent cell parameters to simulate thermal expansion, and the temperature-dependent thermodynamic data of material can be accurately calculated, which can help to quantitatively reveal the relative contribution of entropy and enthalpy to free energy, and evaluate the influence of phonon reorganization and thermal expansion on material stability.The core idea of the temperature-dependent effective potential method is to use a temperature-dependent effective harmonic potential to approximate the true atomic vibration potential, and the temperature dependence is reflected in the displacement of the atoms from their equilibrium positions due to thermal and quantum fluctuations.The use of efficient random sampling to estimate the potential energy surface can greatly reduce the computational cost compared to molecular dynamics calculations.

The invention provides an intermediate infrared sensing device and method based on Fano-phonon resonance. The device comprises a laser emission module, a polarization regulation and control module, an optical path transmission and action module and a signal detection and analysis module which are connected in sequence. Wherein the optical path transmission and action module comprises a Fano-phonon resonance system, and the Fano-phonon resonance system is composed of a plurality of chiral metasurface structure units which are arranged periodically; each chiral metasurface structure unit comprises a first metal layer, a dielectric layer and a second metal layer which are arranged in sequence; the second metal layer is of an asymmetric structure and comprises a first rectangle and a second rectangle which are arranged in parallel, and a quarter circle structure which is arranged adjacent to any one of the first rectangle and the second rectangle; therefore, a high-intensity circular dichroism value can be generated in an infrared band in a target, and clear and easy-to-detect spectrum splitting characteristics are generated through mixed coupling of Fano resonance and molecular phonon resonance, so that label-free and high-precision fingerprint identification of specific molecules is realized.

The application belongs to the technical field of thermal conductivity regulation, and particularly discloses a method for quantitatively regulating thermal conductivity of a material, which comprises the following steps: obtaining the second-order derivative or third-order derivative of the energy eigenvalue of electrons in the material and the ground state energy with respect to atomic displacement; if the second-order derivative is obtained, the contribution value of each eigenmode to thermal conductivity is calculated in combination with a stable temperature gradient; if the third-order derivative is obtained, the mode thermal conductivity and the lattice thermal conductivity are obtained; the material thermal conductivity contribution spectrum is obtained according to the contribution value of each eigenmode to thermal conductivity or the mode thermal conductivity, and the phonon eigenmode that dominates the thermal conductivity of the material is selected; the resonance absorption of terahertz pulse is used to excite the phonon of a specific frequency, so that the number of the phonon eigenmode that dominates the thermal conductivity of the material is changed, and the thermal conductivity of the material is changed and regulated. The application regulates in situ, changes the thermal conductivity of the material without affecting other mechanical properties, is simple to control, low in cost and fast in response.

The invention relates to the technical field of mechanical engineering, in particular to a sliding block skirt belt anti-deformation structure, a manufacturing method and a linear motion guide rail device.The sliding block skirt belt anti-deformation structure comprises a base body, the base body is composed of a first material layer, the first material layer is composed of a material with gradient performance, and material components of the first material layer change in a continuous or stepped mode along a specific path; a second material layer, a cavity and a sensing unit are arranged in the base body; the second material layer is arranged in the base body and is used for inhibiting elastic wave propagation, at least one cavity is embedded in the base body, the cavity is filled with intelligent fluid with adjustable rheological properties, and the sensing unit is arranged below a stress surface close to the base body and is used for sensing the elastic wave. Through mutual cooperation of the gradient material base body, the photonic crystal vibration suppression structure, the intelligent fluid damping cavity and the embedded sensing control network, a multi-mode cooperative anti-deformation mechanism of material rigidity gradient distribution, vibration band gap filtering, fluid self-adaptive damping and state real-time regulation and control can be achieved.

The application discloses a low-temperature hydrogen sensor based on acoustic metamaterials, which is a tubular structure composed of two parts of phononic crystals, interface states are formed on the butt joint interface of the two parts of phononic crystals, and the detection of hydrogen concentration is realized by utilizing the relationship between the frequency of the interface states and the acoustic characteristics of the gas medium in the tube. The low-temperature hydrogen sensor provided by the application uses acoustic interface states as the basic principle of the sensor, can avoid the shortcoming that the performance of the traditional hydrogen sensor is reduced with the reduction of temperature, and thus realizes low-temperature hydrogen sensing. The frequency of the interface states is determined by the acoustic characteristics of the gas medium in the tube, and the acoustic characteristics of hydrogen are quite different from those of air, so when hydrogen is mixed into air, the interface states will be shifted, and thus the hydrogen concentration can be detected by measuring the frequency and the sound pressure at the interface. The application does not need sensitive materials to absorb hydrogen in principle, and thus can be used at extremely low temperature.

The invention relates to the technical field of heat conduction performance of nano materials, and provides a simulation regulation and control method for heat conduction performance of a carbon nanotube superlattice structure, which comprises the following steps: constructing a coaxial double-wall nanotube structure model, and setting inner and outer nanotube structures of the coaxial double-wall nanotube structure model; setting simulation parameters of the coaxial double-wall nanotube structure model; based on unbalanced molecular dynamics simulation, performing simulation calculation on the heat conductivity of the coaxial double-wall nanotube structure model of the outer-layer wrapping tube under different period lengths to obtain the heat conductivity of the coaxial double-wall nanotube structure model corresponding to different period lengths; and analyzing the thermal conductivity of the coaxial double-wall nanotube structure model corresponding to different period lengths to obtain a result of a change rule of the thermal conductivity along with the period length, researching the phonon transport property of the boron nitride carbon nanotube superlattice, and researching the influence of the vdW effect on phonon coherent transport. And a new theoretical basis is provided for developing a nanometer thermal management device based on the quantum coherence effect.