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  • 1
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 71, No. 6 ( 2022), p. 067601-
    Abstract: Water is one of the most important substances in the world. It is a crucial issue to study the dynamics of water molecules at interfaces or in the confined systems. In recent years, the emerging magnetic resonance technique based on nitrogen-vacancy (NV) center has allowed us to observe the nanoscale nuclear magnetic signal and temperature simultaneously. Here we succeed in measuring the nuclear magnetic resonance (NMR) signals of nanoscale solid and liquid water on diamond surface by NV center, and observing the solid-liquid phase transition of these nano-water by temperature control. This work demonstrates that the nano-NMR technique based on NV centers can probe the dynamics behavior of nanoscale materials effectively, providing a new way for studying the nanoscale confined systems.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2022
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  • 2
    Online Resource
    Online Resource
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2022
    In:  Acta Physica Sinica Vol. 71, No. 18 ( 2022), p. 187202-
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 71, No. 18 ( 2022), p. 187202-
    Abstract: At a half-filled Landau level, composite fermions with chiral 〈i〉p〈/i〉-wave pairing will form a Moore-Read state which hosts charge-〈i〉e〈/i〉/4 fractional excitation. This excitation supports non-Abelian statistics and has potential to enable topological quantum computation. Owing to the 〈i〉SU〈/i〉(4) symmetry of electron and electric-field tunability, the bilayer graphene becomes an ideal platform for exploring physics of multi-component quantum Hall state and is candidate for realizing non-Abelian statistics. In this work, high-quality bilayer graphene/hBN heterostructure is fabricated by using dry-transfer technique, and electric transport measurement is performed to study quantum Hall state behavior in bilayer graphene under electric field and magnetic field. Under strong magnetic field, the sequences of incompressible state with quantized Hall conductivity are revealed at –5/2, –1/2, 3/2 filling of Landau level. The feature of even-denominator quantum Hall state is more visible then weaker with increasing magnetic field, and this corresponds to the polarization of Landau level wave function. The experimental results indicate that the observed even-denominator fractional quantum Hall state belongs to the topological phase described by Pfaffian wavefunction.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2022
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  • 3
    Online Resource
    Online Resource
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2021
    In:  Acta Physica Sinica Vol. 70, No. 1 ( 2021), p. 017408-
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 70, No. 1 ( 2021), p. 017408-
    Abstract: High-〈i〉T〈/i〉〈sub〉c〈/sub〉 cuprates, iron-based superconductors, heavy-fermion superconductors and 〈i〉κ〈/i〉-type layered organic superconductors share some common features − the proximity of the superconducting state to the magnetic ordered state and the non-〈i〉s〈/i〉-wave superconducting pairing function. It is generally believed that the Cooper pairings in these unconventional superconductors are mediated by spin fluctuations. In this paper, we present a brief overview on the spin dynamics and unconventional pairing, focusing on high-〈i〉T〈/i〉〈sub〉c〈/sub〉 cuprates and iron-based superconductors. In particular, we will overview the properties of the neutron spin resonance and its possible origin, the pairing mechanism in Hubbard model within the weak-coupling framework and its application to the aforesaid unconventional superconductors. We point out that the interplay between magnetism and superconductivity is still an area of active research.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2021
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  • 4
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 73, No. 7 ( 2024), p. 070301-
    Abstract: The Landau Fermi liquid theory and the Ginzburg-Landau phase transition theory stand as two pivotal cornerstones in traditional condensed matter physics, achieving significant success in addressing crucial physical phenomena such as BCS superconductors and liquid helium superfluids. However, marked by the discoveries of the quantum Hall effect and high-temperature superconductivity in the 1980s, it gradually became evident that for a broad class of novel quantum states, such as fractional quantum Hall states and quantum spin liquids, their properties transcend the Landau Fermi liquid theory and Ginzburg-Landau phase transition theory. Topological order and its related concepts of long-range many-body quantum entanglement and fractionalized excitation have become the key concepts to understand these exotic quantum states. Designing and identifying topologically ordered states of matter in quantum materials and quantum simulation systems, and probing and manipulating their fractionalized excitations, are important research directions in modern condensed matter physics. In recent years, great progress has been made in the quantum simulation and manipulation of topological order on highly controllable quantum simulation platforms, such as Rydberg atomic systems, superconducting quantum processors, and two-dimensional moiré superlattices. This article provides a brief overview of recent research advances and challenges in the study of topological order in traditional condensed matter systems and quantum simulation experimental platforms. It also provides prospects for the future developments of this field.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2024
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  • 5
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 71, No. 16 ( 2022), p. 168701-
    Abstract: Supported lipid bilayer (SLB) based biosensors possess biomedical applications such as in rapid detection of antigens and cytochromes. It is generally believed that the SLB can be formed by adsorbing and spontaneously rupturing vesicles on substrate. Recent findings highlight the importance of investigating the adsorption and rupture of individual vesicles during the SLB formation. Here, we use total internal reflection fluorescence microscopy (TIRFM) to characterize the spatiotemporal kinetics of the front spreading at patch boundary. Owing to the mixture of labeled and unlabeled vesicles individual vesicle or patch on the surface can be identified. The TIRFM is employed to investigate the adsorption, rupture of vesicles, and spreading of the patch front. Combining quartz crystal microbalance with dissipation monitoring (QCM-D) and TIRFM characterizations, we find that the size of vesicle has a significant effect on the front spreading at the patch boundary. Quantification of the number of patches and patches area displays that smaller vesicles are more prone to the formation of patches. The front spreading at the patch boundary is analyzed quantitatively using the average front growth velocity (〈inline-formula〉〈tex-math id="M3"〉\begin{document}$ {v}_{\rm afv} $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="16-20220309_M3.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="16-20220309_M3.png"/〉〈/alternatives〉〈/inline-formula〉), which indicates that the 〈inline-formula〉〈tex-math id="M4"〉\begin{document}$ {v}_{\rm afv} $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="16-20220309_M4.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="16-20220309_M4.png"/〉〈/alternatives〉〈/inline-formula〉of 40-nm vesicles is one order of magnitude larger than that of the 112 nm vesicles. Both theoretical analysis and experimental observation show that the smaller vesicles can attain the higher concentration on the surface (〈i〉C〈/i〉) and high diffusivity in the medium. The global growth theoretical model (GGM) presents that for the patches with the same surface area and vesicle exposure time, the growth of the patch depends on 〈i〉C〈/i〉 and lipid loss percentage during the vesicle rupture. The calculated lipid loss of the smaller vesicles is slightly higher than that of the larger vesicles, while 〈i〉C〈/i〉 plays a dominating role in determining the disparity of the patch growth between the different vesicles. This study promotes the understanding of the growth mechanism of patches on the surface. It demonstates the critcial role of the supply of vesicles in this process and provides an enlightenment for investigating the reassembly of lipids on a nanoscale.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2022
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  • 6
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 64, No. 9 ( 2015), p. 094210-
    Abstract: Singlet fission is a spin-allowed process that creates two triplet excitons from one photo-excited singlet exciton in organic semiconductors. This process of carrier multiplication holds the great potential to break the theoretical efficiency limit in single-junction solar cells by making better use of high-energy photons, while capturing lower-energy photons in the usual style. Photovoltaic devices based on singlet fission have achieved external quantum efficiencies in excess of 100%. In this paper, we first introduce the basic concept about singlet fission and review the history of the field briefly. Then, we report some reflent advances in the reflearch of singlet fission progress with the combination of our group’s productions. Tetracene and pentacene are chosen as typical polyacene materials for discuss. We describe how scientists make progresses in understanding the underlying physics in singlet fission process. The experimental methods of transient absorption spectra, time-resolved fluorescence spectra and time-resolved two-photon photoemission spectra render numerous results for analysis. Moreover, a survey about the debate on the direct or indirect mechanism with transient optical study is provided. It has been verified that multiexciton state intermediates in singlet fission process and the factors of energy level alignments, intermolecular interaction as well as lattice vibrations play a role in it. Last, we briefly summarize the implications of singlet fission in organic solar devices by introducing several composite architectures for singlet-fission photovoltaics. Designing efficient and cheap solar cells is the ultimate goal for understanding the intrinsic photophysics of singlet fission. To obtain high efficiencies, it is important to adapt proper materials and new organic/inorganic architectures may become a promising direction. Also, finding a way for efficient triplet exciton dissociation should be considered seriously. It is believable that these guidelines can lead to the development of cheap and efficient fission-based devices.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2015
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  • 7
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 65, No. 14 ( 2016), p. 147101-
    Abstract: The main purpose of this work is to explore the influences of microstructures on the magnetic properties, as well as the formation mechanism of -Fe2O3/NiO core/shell nanoflowers. The synthesis of nanoflower-like samples includes three processes. Firstly, Fe3O4 nanospheres are synthesized by the solvothermal reaction of FeCl3 dissolved in ethylene glycol and NaAc. Secondly, Fe3O4/Ni(OH)2 core/shell precursor is fabricated by solvothermal method through using the early Fe3O4 spheres and Ni(NO3)26H2O in an ethanol solution. Finally, the precursor Fe3O4/Ni(OH)2 is calcined in air at 300 ℃ for 3-6 h, and therefore resulting in -Fe2O3/NiO core/shell nanoflowers. Their microstructures are characterized by using XRD, XPS, SEM, HRTEM and SAED techniques. The results show that the final powder samples are -Fe2O3/NiO with typical core/shell structure. In this core/shell system, the -Fe2O3 sphere acts as core and the NiO acts as shell, which are comprised of many irregular flake-like nanosheets with monocrystalline structure, and these nanosheets are packed together on the surfaces of -Fe2O3 spheres. The calcination time of Fe3O4/Ni(OH)2 precursor has significant influences on the grain growth, the NiO content and the compactness of NiO shells in the -Fe2O3/NiO core/shell system. VSM and SQUID are used to characterize the magnetic properties of -Fe2O3/NiO core/shell nanoflowers. The results indicate that the 3 h-calcined sample displays better ferromagnetic properties (such as higher ms and smaller HC) because of their high -Fe2O3 content. In addition, as the coupling interaction between the FM -Fe2O3 and AFM NiO components, we observe that the -Fe2O3/NiO samples formed in 3 h and 6 h display certain exchange bias (HE=20 and 46 Oe, respectively). Such a coupling effect allows a variety of reversal paths for the spins upon cycling the applied field, and thereby resulting in the enhancement of coercivity (HC(FC)=252 and 288 Oe, respectively). Further, the values of HE and HC for the former are smaller than those of the latter, this is because of the AFM NiO content in 6 h-calcined sample much higher than that in 3 h-calcined sample. Especially, the temperature dependences of the magnetization M of the two samples under both ZFC and FC conditions indicate that an extra anisotropy is induced. In a word, the size effect, NiO phase content, and FM-AFM (where FM denotes the ferromagnetic -Fe2O3 component, while AFM is the antiferromagnetic NiO component) interface coupling effect have significant influence on the magnetic properties of -Fe2O3/NiO core/shell nanoflowers.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2016
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  • 8
    In: Opto-Electronic Advances, Opto-Electronic Advances, Vol. 4, No. 9 ( 2021), p. 200092-200092
    Type of Medium: Online Resource
    ISSN: 2096-4579
    Language: Unknown
    Publisher: Opto-Electronic Advances
    Publication Date: 2021
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  • 9
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 64, No. 9 ( 2015), p. 097502-
    Abstract: Combining ferroelectric with antiferromagentic materials in nanometer scale is an effective method for exploring multiferroic materials. We preflent two kinds of systems to show the possibility of multiferroic properties in such nanometer composites. One is the artificial superlattice LaFeO3-YMnO3, and the other is the natural layered Aurivillius material Bi4Ti3O12 doped with different layers of LaFeO3, BiFeO3. Both materials were synthesized by pulsed laser deposition method on SrTiO3 substrates. Microstructural charterizations with XRD, TEM, and EELS in scanning transmission electron microscopy mode substantiate that the samples have atomically sharp interfaces between neighboring layers; this is important for producing possible magneto-electric coupling in multiferroic materials. Magnetic characterization proves that these materials have ferrimagnetic properties, in spite of their anti-ferromagnetic nature before coupling. Magnetic characterization also proves that there is 0.55-0.9 B remanant magnetization generated at LaFeO3-YMnO3 interface. And the 0.5 and 1.5LaFeO3-Bi4Ti3O12 samples show ferrimagnetism which can remain even up to room temperature. Ferroelectric tests prove that there is a large leakage current in LaFeO3-YMnO3 superlattice and BiFeO3-inserted Bi4Ti3O12, but 0.5LaFeO3-Bi4Ti3O12 shows ferroelectric hysteresis loops. It can be therefore concluded that 0.5LaFeO3-Bi4Ti3O12 is a multiferroic material. If more perovskite layers (3-layer SrTiO3 or 2.5-layer LaFeO3) are inserted, the Aurivillius structure of Bi4Ti3O12 may appear structural instability that can be observed in our HRTEM measureflent. Our first principles calculations show that the degeneracy of formation enthalpies is the reason why the intergrowth in these materials forms and their structures are not stable. Our work may provide some examples for exploring new multiferroics by means of nano-meter composite.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2015
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  • 10
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 71, No. 17 ( 2022), p. 176301-
    Abstract: Two-dimensional WTe〈sub〉2〈/sub〉 possesses a special crystal symmetry, leading to novel properties such as quantum spin Hall effect and nonlinear Hall effect. Determining the details of its crystal structure is essential for understanding these interesting properties. Here, we report an optical study on the crystal symmetry of monolayer, bilayer, and trilayer WTe〈sub〉2〈/sub〉, using temperature and polarization dependent Raman spectroscopy and optical second harmonic generation (SHG). We find that monolayer WTe〈sub〉2〈/sub〉 is noncentrosymmetric as indicated by its sizable SHG, in contrast to the commonly believed centrosymmetric 1〈i〉T'〈/i〉 structure. The polarization dependence of the SHG is consistent with the 〈i〉C〈/i〉〈sub〉s〈/sub〉 point group. Bilayer WTe〈sub〉2〈/sub〉 exhibits SHG signal more than one order of magnitude higher than in the monolayer and trilayer samples, with its temperature dependence reflecting the ferroelectric phase transition, evidencing strong inversion symmetry breaking induced by layer stacking and interlayer-sliding ferroelectricity. We also observe prominent second-order resonant Raman scattering peaks only in monolayer and bilayer WTe〈sub〉2〈/sub〉, but not in thicker samples, and their temperature dependence indicates an electronic structure highly sensitive to interlayer coupling. These results will be useful for further exploring the properties of atomically thin WTe〈sub〉2〈/sub〉.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2022
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