Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices

Xiamen, China

Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices

Xiamen, China
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Chen L.,Fujian Normal University | Chen L.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Weng M.,Fujian Normal University | Weng M.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | And 8 more authors.
Nanoscale | Year: 2017

Carbon-based electrothermal or photothermal actuators have attracted intense attention recently. They can directly convert electrical or light energy into thermal energy and exhibit obvious deformations. However, if the actuation mechanism is only limited to thermal expansion, the deformation amplitude is difficult to increase further. Moreover, complex shape-deformation is still challenging. Although a few materials were reported to realize twisting or untwisting actuation by cutting the samples into strips along different orientations, each single strip could perform only one shape-deformation mode. In this work, we propose multi-responsive actuators based on a graphene oxide (GO) and biaxially oriented polypropylene (BOPP) composite, which are designed with different shapes (strip-shape and helical-shape). The strip-shape GO/BOPP actuator shows great bending actuations when driven by humidity (curvature of up to 3.1 cm-1). Due to a developed dual-mode actuation mechanism, the actuator shows a bending curvature of 2.8 cm-1 when driven by near infrared (NIR) light. The great actuation outperforms most other carbon-based actuators. Then, an intelligent robot based on the GO/BOPP composite is fabricated, which can switch between the protection mode and weightlifting mode with different external stimuli. Inspired from plant tendrils, a bioinspired helical GO/BOPP actuator is further realized to show both twisting and untwisting actuations in a single actuator, fully mimicking the deformation of plant tendrils. Finally, a robot arm consisting of strip-shape and helical GO/BOPP actuators can grasp an object that is 2.9 times heavier than itself, demonstrating promising bioinspired applications. © 2017 The Royal Society of Chemistry.


Huang F.,Fujian Normal University | Huang F.,Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials | Huang F.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Chen D.,Hangzhou Dianzi University
Journal of Materials Chemistry C | Year: 2017

In this work, Mn2+:Zn2SiO4-Eu3+:Gd2O3 nanocomposites were fabricated following a multi-step solution route. The fluorescence intensity ratio of Mn2+ to Eu3+ in these composites exhibits remarkable temperature dependence, owing to the diverse thermal quenching behaviors of Mn2+ and Eu3+ ions. Using these nanomaterials to perform thermometry, excellent temperature sensitivity is achieved in the room temperature range. Specifically, the values of relative temperature sensitivity are all beyond 2.5% K-1 in the whole range of 303-323 K (i.e. 30-50 °C), and reach as high as 3.05% K-1 at 303 K, remarkably higher than those of other inorganic optical thermometric materials at a similar temperature. And the absolute sensitivities are all beyond 0.0089 K-1 in this temperature range, which is also a relatively high value. These results indicate the Mn2+:Zn2SiO4-Eu3+:Gd2O3 nanocomposites to be very promising nano-thermometric materials. © 2017 The Royal Society of Chemistry.


Wu T.,Fujian Normal University | Wu T.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Liao R.,Fujian Normal University | Liao R.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices
New Journal of Physics | Year: 2017

We consider two-component Bose-Einstein condensates subject to Weyl spin-orbit coupling. We obtain mean-field ground state phase diagram by variational method. In the regime where interspecies coupling is larger than intraspecies coupling, the system is found to be fully polarized and condensed at a finite momentum lying along the quantization axis. We characterize this phase by studying the excitation spectrum, the sound velocity, the quantum depletion of condensates, the shift of ground state energy, and the static structure factor. We find that spin-orbit coupling and interspecies coupling generally leads to competing effects. © 2017 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.


Zhang J.M.,Fujian Normal University | Zhang J.M.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Mauser N.J.,University of Vienna
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2016

We study the optimal Slater-determinant approximation of an N-fermion wave function analytically. That is, we seek the Slater-determinant (constructed out of N orthonormal single-particle orbitals) wave function having largest overlap with a given N-fermion wave function. Some simple lemmas have been established and their usefulness is demonstrated on some structured states, such as the Greenberger-Horne-Zeilinger state. In the simplest nontrivial case of three fermions in six orbitals, which the celebrated Borland-Dennis discovery is about, the optimal Slater approximation wave function is proven to be built out of the natural orbitals in an interesting way. We also show that the Hadamard inequality is useful for finding the optimal Slater approximation of some special target wave functions. © 2016 American Physical Society.


Yang R.-C.,Fujian Normal University | Yang R.-C.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Lin X.,Fujian Normal University | Lin X.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Liu H.-Y.,Yanbian University
Communications in Theoretical Physics | Year: 2017

A proposal for the generation of singlet states of three Λ-type Rydberg atoms is presented via the interaction between a separate Rydberg state and an EPR pair. Different from previous schemes, we do not need to couple ground states by using microwave lights but to set appropriate frequency detuning between lasers and two atomic transitions between ground states and Rydberg levels to eliminate the degenerate of the two ground states, making the present protocol more easily in experiment. Moreover, a series of numerical simulations are made to show the feasibility. © 2017 Chinese Physical Society and IOP Publishing Ltd.


Zhang J.M.,Fujian Normal University | Zhang J.M.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Liu Y.,CAS Beijing Institute of Applied Physics And Computational Mathematics | Liu Y.,China Academy of Engineering Physics
European Journal of Physics | Year: 2016

Fermis golden rule is of great importance in quantum dynamics. However, in many textbooks on quantum mechanics, its contents and limitations are obscured by the approximations and arguments in the derivation, which are inevitable because of the generic setting considered. Here we propose to introduce it by an ideal model, in which the quasi-continuum band consists of equaldistant levels extending from -∞ to +∞, and each of them couples to the discrete level with the same strength. For this model, the transition probability in the first order perturbation approximation can be calculated analytically by invoking the Poisson summation formula. It turns out to be a piecewise linear function of time, demonstrating on the one hand the key features of Fermis golden rule, and on the other hand that the rule breaks down beyond the Heisenberg time, even when the first order perturbation approximation itself is still valid. © 2016 IOP Publishing Ltd.


Zhang J.M.,Fujian Normal University | Zhang J.M.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Yang H.-T.,Northeast Normal University
EPL | Year: 2016

We take a one-dimensional tight-binding chain with periodic boundary condition and put a particle in an arbitrary Bloch state, then quench it by suddenly changing the potential of an arbitrary site. In the ensuing time evolution, the probability density of the wave function at an arbitrary site jumps indefinitely between plateaus. This phenomenon adds to a former one in which the survival probability of the particle in the initial Bloch state shows cusps periodically, which was found in the same scenario (Zhang J. M. and Yang H.-T., EPL, 114 (2016) 60001). The plateaus support the scattering wave picture of the quench dynamics of the Bloch state. Underlying the cusps and jumps is the exactly solvable, nonanalytic dynamics of a Luttinger-like model, based on which, the locations of the jumps and the heights of the plateaus are accurately predicted. © CopyrightEPLA, 2016.


Zhang J.M.,Fujian Normal University | Zhang J.M.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Yang H.-T.,Northeast Normal University
EPL | Year: 2016

We report some nonsmooth dynamics of a Bloch state in a one-dimensional tight binding model with the periodic boundary condition. After a sudden change of the potential of an arbitrary site, quantities like the survival probability of the particle in the initial Bloch state show cusps periodically, with the period being the Heisenberg time associated with the energy spectrum. This phenomenon is a nonperturbative counterpart of the nonsmooth dynamics observed previously (Zhang J. M. and Haque M., arXiv:1404.4280) in a periodically driven tight binding model. Underlying the cusps is an exactly solvable model, which consists of equally spaced levels extending from to , between which two arbitrary levels are coupled to each other by the same strength. © Copyright EPLA, 2016.


Hong Z.,Fujian Normal University | Hong Z.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Hong J.,Fujian Normal University | Xie C.,Fujian Normal University | And 3 more authors.
Electrochimica Acta | Year: 2016

In this paper, we report a one-step and additive-free route for synthesizing hierarchical rutile TiO2 with mesocrystalline structure. The rutile TiO2 architecture constructed by oriented tiny nanorod subunits (around 5 nm in diameter) have nano/submicro hierarchical structures, nanoporous nature, a relatively large surface area and high tapped density. When the hierarchical rutile TiO2 was studied as anode material for Li-ion batteries (LIBs), they exhibited a high reversible capacity of more than 250 mAh g-1 within a voltage window of 1-3 V, superior rate capability and very good cycling stability with 220 mAh g-1 after 100 cycles at 0.1 A g-1. It's notable that the hierarchical rutile TiO2 exhibited superior Li-ion storage properties under deep cycling conditions (0.01-3.0 V), a stable capacity of 346 mAh g-1 after 100 cycles at 0.1 A g-1 could be remained. The hierarchical TiO2 also displayed a large reversible capacity of more than 255 mAh g-1 (average value) at 0.05 A g-1 and good cycling performance for Na-ion insertion. These results, in combination with high volumetric storage capacity, render hierarchical rutile TiO2 a promising anode material for rechargeable batteries. © 2016 Elsevier Ltd. All rights reserved.


Xie H.,Fujian Normal University | Xie H.,Fujian Prov Collaborative Innovation Center For Optoelectronic Semiconductors And Efficient Devices | Xie H.,Fujian Agriculture and forestry University | Chen X.,Fujian Normal University | And 4 more authors.
Optics Communications | Year: 2016

A scheme to correlate optical and microwave photons is proposed in a hybrid electro-optomechanical system, where mechanical resonator is coupled to both optical and microwave fields. Analytical and numerical simulation results show that the cross-correlation function between Stokes and anti-Stokes photons strongly violates the Cauchy-Schwarz inequality, which confirms the nonclassical correlation between the optical and microwave photons. It is worth noting that the nonclassical photon pairs with vast different wavelengths, which may be useful for quantum communication, are generated under the experimentally accessible weak coupling limit rather than single-photon strong coupling regime. In addition, the protocol provides a possible route to combine the respective advantages of optical photons, microwave photons, and phonons in a hybrid electro-optomechanical system. © 2016 Elsevier B.V. All rights reserved.

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