Chinese Physics Letters最新文献

{"title":"Dynamical t/U Expansion of the Doped Hubbard Model","authors":"Wenxin Ding, Rong Yu","doi":"10.1088/0256-307x/41/3/037101","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/037101","url":null,"abstract":"We construct a new <italic toggle=\"yes\">U</italic>(1) slave-spin representation for the single-band Hubbard model in the large-<italic toggle=\"yes\">U</italic> limit. The mean-field theory in this representation is more amenable to describe both the spin-charge-separation physics of the Mott insulator at half-filling and the strange metal behavior at finite doping. By employing a dynamical Green’s function theory for slave spins, we calculate the single-particle spectral function of electrons. The result is comparable to that in dynamical mean field theories. We then formulate a dynamical <italic toggle=\"yes\">t</italic>/<italic toggle=\"yes\">U</italic> expansion for the doped Hubbard model that reproduces the mean-field results at the lowest order of expansion. To the next order of expansion, it naturally yields an effective low-energy theory of a <italic toggle=\"yes\">t</italic>–<italic toggle=\"yes\">J</italic> model for spinons self-consistently coupled to an <italic toggle=\"yes\">XXZ</italic> model for the slave spins. We show that the superexchange <italic toggle=\"yes\">J</italic> is renormalized by doping, in agreement with the Gutzwiller approximation. Surprisingly, we find a new <italic toggle=\"yes\">ferromagnetic</italic> channel of exchange interactions which survives in the infinite <italic toggle=\"yes\">U</italic> limit, as a manifestation of the Nagaoka ferromagnetism.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"45 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tuning Excitation Transport in a Dissipative Rydberg Ring","authors":"Yiwen Han, Wei Yi","doi":"10.1088/0256-307x/41/3/033201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/033201","url":null,"abstract":"We demonstrate the flexible tunability of excitation transport in Rydberg atoms, under the interplay of controlled dissipation and interaction-induced synthetic flux. Considering a minimum four-site setup, i.e., a triangular configuration with an additional output site, we study the transport of a single excitation, injected into a vertex of the triangle, through the structure. While the long-range dipole-dipole interactions between the Rydberg atoms lead to geometry-dependent Peierls phases in the hopping amplitudes of excitations, we further introduce on-site dissipation to a vertex of the triangle. As a result, both the chirality and destination of the transport can be manipulated through the flux and dissipation. In particular, we illustrate a parameter regime where our Rydberg-ring structure may serve as a switch for transporting the injected excitation through to the output site. The underlying mechanism is then analyzed by studying the chiral trajectory of the excitation and the time-dependent dissipation. The switchable excitation transport reported here offers a flexible tool for quantum control in Rydberg atoms, and holds interesting potentials for applications in quantum simulation and quantum information.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"13 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hard Superconducting Gap in PbTe Nanowires","authors":"Yichun Gao, Wenyu Song, Shuai Yang, Zehao Yu, Ruidong Li, Wentao Miao, Yuhao Wang, Fangting Chen, Zuhan Geng, Lining Yang, Zezhou Xia, Xiao Feng, Yunyi Zang, Lin Li, Runan Shang, Qi-Kun Xue, Ke He, Hao Zhang","doi":"10.1088/0256-307x/41/3/038502","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/038502","url":null,"abstract":"Semiconductor nanowires coupled to a superconductor provide a powerful testbed for quantum device physics such as Majorana zero modes and gate-tunable hybrid qubits. The performance of these quantum devices heavily relies on the quality of the induced superconducting gap. A hard gap, evident as vanishing subgap conductance in tunneling spectroscopy, is both necessary and desired. A hard gap has been achieved and extensively studied before in III–V semiconductor nanowires (InAs and InSb). In this study, we present the observation of a hard superconducting gap in PbTe nanowires coupled to a superconductor Pb. The gap size <italic toggle=\"yes\">Δ</italic> is ∼ 1 meV (maximally 1.3 meV in one device). Additionally, subgap Andreev bound states can also be created and controlled through gate tuning. Tuning a device into the open regime can reveal Andreev enhancement of the subgap conductance. These results pave the way for diverse superconducting quantum devices based on PbTe nanowires.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"142 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production of the X(4014) as the Spin-2 Partner of X(3872) in e + e − Collisions","authors":"Pan-Pan Shi, Vadim Baru, Feng-Kun Guo, Christoph Hanhart, Alexey Nefediev","doi":"10.1088/0256-307x/41/3/031301","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/031301","url":null,"abstract":"In 2021, the Belle collaboration reported the first observation of a new structure in the <italic toggle=\"yes\">ψ</italic>(2<italic toggle=\"yes\">S</italic>)<italic toggle=\"yes\">γ</italic> final state produced in the two-photon fusion process. In the hadronic molecule picture, this new structure can be associated with the shallow isoscalar <inline-formula>\u0000<tex-math>\u0000<?CDATA ${D}^{* }{overline{D}}^{* }$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msup><mml:mi>D</mml:mi><mml:mo>*</mml:mo></mml:msup><mml:msup><mml:mover accent=\"true\"><mml:mi>D</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mo>*</mml:mo></mml:msup></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"cpl_41_3_031301_ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> bound state and as such is an excellent candidate for the spin-2 partner of the <italic toggle=\"yes\">X</italic>(3872) with the quantum numbers <italic toggle=\"yes\">J</italic>\u0000^PC = 2⁺⁺ conventionally named <italic toggle=\"yes\">X</italic>\u0000₂. In this work we evaluate the electronic width of this new state and argue that its nature is sensitive to its total width, the experimental measurement currently available being unable to distinguish between different options. Our estimates demonstrate that the planned Super <italic toggle=\"yes\">τ</italic>-Charm Facility offers a promising opportunity to search for and study this new state in the invariant mass distributions for the final states <italic toggle=\"yes\">J</italic>/<italic toggle=\"yes\">ψγ</italic> and <italic toggle=\"yes\">ψ</italic>(2<italic toggle=\"yes\">S</italic>)<italic toggle=\"yes\">γ</italic>.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Opportunities of Advanced Physical Studies at the Hefei Advanced Light Facility","authors":"Zhe Sun, Donglai Feng","doi":"10.1088/0256-307x/41/3/037303","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/037303","url":null,"abstract":"Synchrotron radiation has transformed the role of x-rays as a mainstream tool for probing the atomic and electronic structure of materials. Synchrotron-based x-ray sciences have been widely used to study the microscopic structure, electronic states, chemical composition, and other properties of materials in fields such as quantum materials, soft matter, energy storage, catalysis, biology, and electronics.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"9 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"e+e−→Λc+Λ¯c− Cross Sections and the Λc+ Electromagnetic Form Factors within the Extended Vector Meson Dominance Model","authors":"Cheng Chen, Bing Yan, Ju-Jun Xie","doi":"10.1088/0256-307x/41/2/021302","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/021302","url":null,"abstract":"Within the extended vector meson dominance model, we investigate the &lt;inline-formula&gt;\u0000&lt;tex-math&gt;\u0000&lt;?CDATA ${e}^{+}{e}^{-}to {varLambda }_{c}^{+}{bar{varLambda }}_{c}^{-}$?&gt;\u0000&lt;/tex-math&gt;\u0000&lt;mml:math overflow=\"scroll\"&gt;&lt;mml:mrow&gt;&lt;mml:msup&gt;&lt;mml:mi&gt;e&lt;/mml:mi&gt;&lt;mml:mo&gt;+&lt;/mml:mo&gt;&lt;/mml:msup&gt;&lt;mml:msup&gt;&lt;mml:mi&gt;e&lt;/mml:mi&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msup&gt;&lt;mml:mo&gt;→&lt;/mml:mo&gt;&lt;mml:msubsup&gt;&lt;mml:mi&gt;Λ&lt;/mml:mi&gt;&lt;mml:mi&gt;c&lt;/mml:mi&gt;&lt;mml:mo&gt;+&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;mml:msubsup&gt;&lt;mml:mover accent=\"true\"&gt;&lt;mml:mi&gt;Λ&lt;/mml:mi&gt;&lt;mml:mo&gt;¯&lt;/mml:mo&gt;&lt;/mml:mover&gt;&lt;mml:mi&gt;c&lt;/mml:mi&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:mrow&gt;&lt;/mml:math&gt;\u0000&lt;inline-graphic xlink:href=\"cpl_41_2_021302_ieqn5.gif\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; reaction and the electromagnetic form factors of the charmed baryon &lt;inline-formula&gt;\u0000&lt;tex-math&gt;\u0000&lt;?CDATA ${varLambda }_{c}^{+}$?&gt;\u0000&lt;/tex-math&gt;\u0000&lt;mml:math overflow=\"scroll\"&gt;&lt;mml:mrow&gt;&lt;mml:msubsup&gt;&lt;mml:mi&gt;Λ&lt;/mml:mi&gt;&lt;mml:mi&gt;c&lt;/mml:mi&gt;&lt;mml:mo&gt;+&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:mrow&gt;&lt;/mml:math&gt;\u0000&lt;inline-graphic xlink:href=\"cpl_41_2_021302_ieqn6.gif\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;. The model parameters are determined by fitting them to the cross sections of the process &lt;inline-formula&gt;\u0000&lt;tex-math&gt;\u0000&lt;?CDATA ${e}^{+}{e}^{-}to {varLambda }_{c}^{+}{bar{varLambda }}_{c}^{-}$?&gt;\u0000&lt;/tex-math&gt;\u0000&lt;mml:math overflow=\"scroll\"&gt;&lt;mml:mrow&gt;&lt;mml:msup&gt;&lt;mml:mi&gt;e&lt;/mml:mi&gt;&lt;mml:mo&gt;+&lt;/mml:mo&gt;&lt;/mml:msup&gt;&lt;mml:msup&gt;&lt;mml:mi&gt;e&lt;/mml:mi&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msup&gt;&lt;mml:mo&gt;→&lt;/mml:mo&gt;&lt;mml:msubsup&gt;&lt;mml:mi&gt;Λ&lt;/mml:mi&gt;&lt;mml:mi&gt;c&lt;/mml:mi&gt;&lt;mml:mo&gt;+&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;mml:msubsup&gt;&lt;mml:mover accent=\"true\"&gt;&lt;mml:mi&gt;Λ&lt;/mml:mi&gt;&lt;mml:mo&gt;¯&lt;/mml:mo&gt;&lt;/mml:mover&gt;&lt;mml:mi&gt;c&lt;/mml:mi&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:mrow&gt;&lt;/mml:math&gt;\u0000&lt;inline-graphic xlink:href=\"cpl_41_2_021302_ieqn7.gif\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; and the magnetic form factor |&lt;italic toggle=\"yes\"&gt;G&lt;/italic&gt;\u0000&lt;sub&gt;M&lt;/sub&gt;| of &lt;inline-formula&gt;\u0000&lt;tex-math&gt;\u0000&lt;?CDATA ${varLambda }_{c}^{+}$?&gt;\u0000&lt;/tex-math&gt;\u0000&lt;mml:math overflow=\"scroll\"&gt;&lt;mml:mrow&gt;&lt;mml:msubsup&gt;&lt;mml:mi&gt;Λ&lt;/mml:mi&gt;&lt;mml:mi&gt;c&lt;/mml:mi&gt;&lt;mml:mo&gt;+&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:mrow&gt;&lt;/mml:math&gt;\u0000&lt;inline-graphic xlink:href=\"cpl_41_2_021302_ieqn8.gif\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;. By considering four charmonium-like states, called &lt;italic toggle=\"yes\"&gt;ψ&lt;/italic&gt;(4500), &lt;italic toggle=\"yes\"&gt;ψ&lt;/italic&gt;(4660), &lt;italic toggle=\"yes\"&gt;ψ&lt;/italic&gt;(4790), and &lt;italic toggle=\"yes\"&gt;ψ&lt;/italic&gt;(4900), we can well describe the current data on the &lt;inline-formula&gt;\u0000&lt;tex-math&gt;\u0000&lt;?CDATA ${e}^{+}{e}^{-}to {varLambda }_{c}^{+}{bar{varLambda }}_{c}^{-}$?&gt;\u0000&lt;/tex-math&gt;\u0000&lt;mml:math overflow=\"scroll\"&gt;&lt;mml:mrow&gt;&lt;mml:msup&gt;&lt;mml:mi&gt;e&lt;/mml:mi&gt;&lt;mml:mo&gt;+&lt;/mml:mo&gt;&lt;/mml:msup&gt;&lt;mml:msup&gt;&lt;mml:mi&gt;e&lt;/mml:mi&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msup&gt;&lt;mml:mo&gt;→&lt;/mml:mo&gt;&lt;mml:msubsup&gt;&lt;mml:mi&gt;Λ&lt;/mml:mi&gt;&lt;mml:mi&gt;c&lt;/mml:mi&gt;&lt;mml:mo&gt;+&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;mml:msubsup&gt;&lt;mml:mover accent=\"true\"&gt;&lt;mml:mi&gt;Λ&lt;/mml:mi&gt;&lt;mml:mo&gt;¯&lt;/mml:mo&gt;&lt;/mml:mover&gt;&lt;mml:mi&gt;c&lt;/mml:mi&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:mrow&gt;","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"176 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139762292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Drug utilization studies in Turkiye: A systematic review.","authors":"Ahmet Akici, Dieudonné Havyarimana, Ertan Direnc, Volkan Aydin","doi":"10.14744/nci.2023.60134","DOIUrl":"10.14744/nci.2023.60134","url":null,"abstract":"<p><strong>Objective: </strong>Drug utilization studies (DUS) provide a framework for drug utilization at the national or targeted population level and important information on unmet medical needs, particularly in assessing the rationality of drug use. We aimed to systematically review DUS conducted in Turkiye.</p><p><strong>Methods: </strong>We examined 162 DUS with an accessible full-text, published as \"research articles\" and conducted in Turkiye between 2000 and 2021 using medical records and prescription data. We included English or Turkish papers with English abstracts. We examined the scientific characteristics of the publications, source of the data, place/time of collection, research designs, and studied drug groups.</p><p><strong>Results: </strong>We found that 79.6% of articles were in English, 45.1% were listed in SCI/SCIE, and 63.0% were on the WOS platform with 3.5 (interquartile range: 1-15) citations. The mean study period and publication time were 2.9±3.1 and 2.9±2.1 years, respectively. The highest number of studies (17.9%) were published in 2021 and (26.5%) were conducted nationwide. We identified that 93.8% of the studies had retrospective design, 67.8% were conducted in secondary/tertiary health-care institutions, and 54.9% used direct hospital data. We detected that 68.5% of the studies were conducted on the general population, 19.1% on adults, 12.4% on children, and 44.4% were antibiotic oriented.</p><p><strong>Conclusion: </strong>Our study showed that a significant portion of the DUS, the trend of which has gained momentum in recent years, was antibiotic focused and conducted with a retrospective design from hospital-based data collected on the general patient population. This situation points to the necessity of expanding the existing DUS range by effectively using the new advantages provided by medical record databases and conducting more DUS that can provide critical clues for specific patients and drug groups.</p>","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"20 1","pages":"10-17"},"PeriodicalIF":1.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10861429/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82608668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heteronuclear Magnetisms with Ultracold Spinor Bosonic Gases in Optical Lattices","authors":"Yongqiang Li, Chengkun Xing, Ming Gong, Guangcan Guo, Jianmin Yuan","doi":"10.1088/0256-307x/41/2/026701","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/026701","url":null,"abstract":"Motivated by recent realizations of spin-1 NaRb mixtures in the experiments [<italic toggle=\"yes\">Phys. Rev. Lett.</italic> <bold>114</bold>, 255301 (2015); <italic toggle=\"yes\">Phys. Rev. Lett.</italic> <bold>128</bold>, 223201 (2022)], we investigate heteronuclear magnetism in the Mott-insulating regime. Different from the identical mixtures where the boson statistics only admits even parity states from angular momentum composition, for heteronuclear atoms in principle all angular momentum states are allowed, which can give rise to new magnetic phases. While various magnetic phases can be developed over these degenerate spaces, the concrete symmetry breaking phases depend on not only the degree of degeneracy but also the competitions from many-body interactions. We unveil these rich phases using the bosonic dynamical mean-field theory approach. These phases are characterized by various orders, including spontaneous magnetization order, spin magnitude order, singlet pairing order, and nematic order, which may coexist specially in the regime with odd parity. Finally we address the possible parameter regimes for observing these spin-ordered Mott phases.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"42 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High Temperature Superconductivity in La3Ni2O7","authors":"Kun Jiang, Ziqiang Wang, Fu-chun Zhang","doi":"10.1088/0256-307x/41/1/017402","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/017402","url":null,"abstract":"\u0000 Motivated by the recent discovery of high-temperature superconductivity in bilayer La3Ni2O7 under pressure, we study its electronic properties and superconductivity due to strong electron correlation. Using the inversion symmetry, we decouple the low-energy electronic structure into block-diagonal symmetric and antisymmetric sectors. We find that the antisymmetric sector can be reduced to a one-band system near half filling, while the symmetric bands occupied by about two electrons are heavily overdoped individually. Using the strong coupling mean field theory, we obtain strong superconducting pairing with B\u0000 1g\u0000 symmetry in the antisymmetric sector. We propose that due to the spin-orbital exchange coupling between the two sectors, B\u0000 1g\u0000 pairing is induced in the symmetric bands, which in-turn boosts the pairing gap in the antisymmetric band and enhances the high-temperature superconductivity with a congruent d-wave symmetry in pressurized La3Ni2O7.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"55 23","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139382100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Localization Dynamics at the Exceptional Point of Non-Hermitian Creutz Ladder","authors":"S. M. Zhang, T. Y. He, L. Jin","doi":"10.1088/0256-307x/41/2/027201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/027201","url":null,"abstract":"\u0000 We propose a quasi-one-dimensional non-Hermitian Creutz ladder with entirely flat spectrum by introducing alternating gain and loss components while maintaining inversion symmetry. Destructive interference generates flat spectrum at the exceptional point, where the Creutz ladder maintains coalesced and degenerate eigenvalues with compact localized states distributed in single plaquette. All excitations are completely confined within the localization area, unaffected by gain and loss. Single-site excitations exhibit nonunitary dynamics with intensities increasing due to level coalescence, while multiple-site excitations may display oscillating or constant intensities at the exceptional point. These results provide insights into the fascinating dynamics of non-Hermitian localization, where level coalescence and degeneracy coexist at the exceptional point.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"9 12","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139381050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}