Condensed Matter最新文献_第8页

Elucidation of Spin-Correlations, Fermi Surface and Pseudogap in a Copper Oxide Superconductor 铜氧化物超导体中自旋关联、费米表面和赝隙的阐明

IF 1.7

Condensed Matter Pub Date : 2023-04-04 DOI: 10.3390/condmat8020033

H. Kamimura, M. Araidai, K. Ishida, Shunichi Matsuno, H. Sakata, K. Sasaoka, K. Shiraishi, O. Sugino, J. Tsai, K. Yamada

{"title":"Elucidation of Spin-Correlations, Fermi Surface and Pseudogap in a Copper Oxide Superconductor","authors":"H. Kamimura, M. Araidai, K. Ishida, Shunichi Matsuno, H. Sakata, K. Sasaoka, K. Shiraishi, O. Sugino, J. Tsai, K. Yamada","doi":"10.3390/condmat8020033","DOIUrl":"https://doi.org/10.3390/condmat8020033","url":null,"abstract":"First-principles calculations for underdoped La2−xSrxCuO4 (LSCO) have revealed a Fermi surface consisting of spin-triplet (KS) particles at the antinodal Fermi-pockets and spin-singlet (SS) particles at the nodal Fermi-arcs in the presence of AF local order. By performing a unique method of calculating the electronic-spin state of overdoped LSCO and by measurement of the spin-correlation length by neutron inelastic scattering, the origin of the phase-diagram, including the pseudogap phase in the high temperature superconductor, Sr-doped copper-oxide LSCO, has been elucidated. We have theoretically solved the long-term problem as to why the angle-resolved photoemission spectroscopy (ARPES) has not been able to observe Fermi pockets in the Fermi surface of LSCO. As a result, we show that the pseudogap region is bounded below the characteristic temperature T*(x) and above the superconducting transition temperature Tc(x) in the T vs. x phase diagram, where both the AF order and the KS particles in the Fermi pockets vanish at T*(x), whilst KS particles contribute to d-wave superconductivity below Tc. We also show that the relationship T*(xc) = Tc(xc) holds at xc = 0.30, which is consistent with ARPES experiments. At T*(x), a phase transition occurs from the pseudogap phase to an unusual metallic phase in which only the SS particles exist.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41803370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films Langmuir–Blodgett自组装石墨烯薄膜的等离子体辅助氮掺杂

IF 1.7

Condensed Matter Pub Date : 2023-04-04 DOI: 10.3390/condmat8020034

T. Tomašević-Ilić, N. Škoro, Đ. Jovanović, N. Puač, M. Spasenović

{"title":"Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films","authors":"T. Tomašević-Ilić, N. Škoro, Đ. Jovanović, N. Puač, M. Spasenović","doi":"10.3390/condmat8020034","DOIUrl":"https://doi.org/10.3390/condmat8020034","url":null,"abstract":"Graphene films prepared from solution and deposited by Langmuir–Blodgett self-assembly technique (LBSA) were treated with radio-frequency (13.56 MHz) nitrogen plasma in order to investigate the influence of the time of nitrogen plasma exposure on the work function, sheet resistance, and surface morphology of LBSA graphene films. Kelvin probe force microscopy and sheet resistance measurements confirm nitrogen functionalization of our films, with the Fermi level shifting in a direction that indicates binding to a pyridinic and/or pyrrolic site. Upon 1 min of nitrogen plasma exposure, the sheet resistance decreases and there is no obvious difference in film morphology. However, plasma exposure longer than 5 min leads to the removal of graphene flakes and degradation of graphene films, in turn, affecting the flake connectivity and increasing film resistance. We show that by changing the exposure time, we can control the work function and decrease sheet resistance, without affecting surface morphology. Controllability of the plasma technique has an advantage for graphene functionalization over conventional doping techniques such as chemical drop-casting. It allows for the controllable tuning of the work function, surface morphology, and sheet resistance of LBSA graphene films, which is substantial for applications in various optoelectronic devices.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47553754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pump-Probe X-ray Photoemission Spectroscopy of Free-Standing Graphane 自立石墨烯的泵浦探针X射线光电子能谱

IF 1.7

Condensed Matter Pub Date : 2023-03-27 DOI: 10.3390/condmat8020031

R. Costantini, Dario Marchiani, M. Betti, C. Mariani, Samuel Jeong, Yoshikazu Ito, A. Morgante, M. Dell’Angela

引用次数: 1

Angle-dependent Magnetoresistance of an Ordered Bose Glass of Vortices in YBa2Cu3O7-δ Thin Films with a Periodic Pinning Lattice 周期性钉钉晶格YBa2Cu3O7-δ薄膜中有序玻色玻璃旋涡的角相关磁阻

IF 1.7

Condensed Matter Pub Date : 2023-03-27 DOI: 10.3390/condmat8020032

B. Aichner, Lucas Backmeister, M. Karrer, K. Wurster, R. Kleiner, E. Goldobin, D. Koelle, W. Lang

{"title":"Angle-dependent Magnetoresistance of an Ordered Bose Glass of Vortices in YBa2Cu3O7-δ Thin Films with a Periodic Pinning Lattice","authors":"B. Aichner, Lucas Backmeister, M. Karrer, K. Wurster, R. Kleiner, E. Goldobin, D. Koelle, W. Lang","doi":"10.3390/condmat8020032","DOIUrl":"https://doi.org/10.3390/condmat8020032","url":null,"abstract":"The competition between intrinsic disorder in superconducting YBa2Cu3O7−δ (YBCO) thin films and an ultradense triangular lattice of cylindrical pinning centers spaced at 30 nm intervals results in an ordered Bose glass phase of vortices. The samples were created by scanning the focused beam of a helium-ion microscope over the surface of the YBCO thin film to form columns of point defects where superconductivity was locally suppressed. The voltage–current isotherms reveal critical behavior and scale in the vicinity of the second-order glass transition. The latter exhibits a distinct peak in melting temperature (Tg) vs. applied magnetic field (Ba) at the magnetic commensurability field, along with a sharp rise in the lifetimes of glassy fluctuations. Angle-dependent magnetoresistance measurements in constant-Lorentz-force geometry unveil a strong increase in anisotropy compared to a pristine reference film where the density of vortices matches that of the columnar defects. The pinning is therefore, dominated by the magnetic-field component parallel to the columnar defects, exposing its one-dimensional character. These results support the idea of an ordered Bose glass phase.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49213339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

FL* Interpretation of a Dichotomy in the Spin Susceptibility of the Cuprates FL*解释铜离子自旋敏感性的二分法

IF 1.7

Condensed Matter Pub Date : 2023-03-23 DOI: 10.3390/condmat8020030

P. Marchetti

引用次数: 0

Investigating the Individual Performances of Coupled Superconducting Transmon Qubits 耦合超导Transmon量子比特的个体性能研究

IF 1.7

Condensed Matter Pub Date : 2023-03-21 DOI: 10.3390/condmat8010029

H. G. Ahmad, Caleb Jordan, Roald van den Boogaart, Daan Waardenburg, Christos Zachariadis, P. Mastrovito, Asen Lyubenov Georgiev, D. Montemurro, G. Pepe, Marten Arthers, A. Bruno, F. Tafuri, O. Mukhanov, M. Arzeo, D. Massarotti

{"title":"Investigating the Individual Performances of Coupled Superconducting Transmon Qubits","authors":"H. G. Ahmad, Caleb Jordan, Roald van den Boogaart, Daan Waardenburg, Christos Zachariadis, P. Mastrovito, Asen Lyubenov Georgiev, D. Montemurro, G. Pepe, Marten Arthers, A. Bruno, F. Tafuri, O. Mukhanov, M. Arzeo, D. Massarotti","doi":"10.3390/condmat8010029","DOIUrl":"https://doi.org/10.3390/condmat8010029","url":null,"abstract":"The strong requirement for high-performing quantum computing led to intensive research on novel quantum platforms in the last decades. The circuital nature of Josephson-based quantum superconducting systems powerfully supports massive circuital freedom, which allowed for the implementation of a wide range of qubit designs, and an easy interface with the quantum processing unit. However, this unavoidably introduces a coupling with the environment, and thus to extra decoherence sources. Moreover, at the time of writing, control and readout protocols mainly use analogue microwave electronics, which limit the otherwise reasonable scalability in superconducting quantum circuits. Within the future perspective to improve scalability by integrating novel control energy-efficient superconducting electronics at the quantum stage in a multi-chip module, we report on an all-microwave characterization of a planar two-transmon qubits device, which involves state-of-the-art control pulses optimization. We demonstrate that the single-qubit average gate fidelity is mainly limited by the gate pulse duration and the quality of the optimization, and thus does not preclude the integration in novel hybrid quantum-classical superconducting devices.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48875290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Electrical Manipulation of Spin-Dependent Anisotropy of a Dirac Cone in a Graphene Superlattice with Alternating Periodic Electrostatic and Exchange Fields 交替周期静电场和交换场对石墨烯超晶格中狄拉克锥自旋相关各向异性的电操纵

IF 1.7

Condensed Matter Pub Date : 2023-03-18 DOI: 10.3390/condmat8010028

Pattana Somroob, W. Liewrian

{"title":"Electrical Manipulation of Spin-Dependent Anisotropy of a Dirac Cone in a Graphene Superlattice with Alternating Periodic Electrostatic and Exchange Fields","authors":"Pattana Somroob, W. Liewrian","doi":"10.3390/condmat8010028","DOIUrl":"https://doi.org/10.3390/condmat8010028","url":null,"abstract":"We studied the spin-dependent behavior of the electronic properties of alternating periodic potentials applied to finite and infinite graphene superlattices coupled with tunable electrostatic and exchange fields. The band structures were evaluated using the transfer matrix approach. The results of tuning the coupled electrostatic potential and exchange field showed that the spin-dependent anisotropy of a Dirac cone depends on the difference between the amplitude of periodically modulated coupling. Spin-dependent collimation occurs when the modulations become zero-average potentials with the ratio of both periodically modulated strengths equals one, in which one spin can be moved freely, but the other one is highly collimated. In addition, we find that the number of extra Dirac points in the infinite superlattice is spin-dependent. In terms of spin-ups, their number increases with an increase in the strength of both modulated fields. To ensure this calculation, we also compute the conductance of finite periodic modulation at zero energy. It is shown that the peaks of the conductance occur when the extra Dirac point emerges. This result may be utilized to design graphene-based devices with highly spin-polarized collimators.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49038343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complex Functions, Multipoles and Light Polarization in a Ferrocell 铁电池中的复函数、多极子和光偏振

IF 1.7

Condensed Matter Pub Date : 2023-03-15 DOI: 10.3390/condmat8010027

A. Tufaile, A. Tufaile

引用次数: 0

Exploring the Ultrafast Charge-Transfer and Redox Dynamics in Layered Transition Metal Oxides 层状过渡金属氧化物的超快电荷转移和氧化还原动力学研究

IF 1.7

Condensed Matter Pub Date : 2023-03-05 DOI: 10.3390/condmat8010025

Guannan Qian, Xiaobiao Huang, Jun-Sik Lee, P. Pianetta, Yijin Liu

引用次数: 0

Using Quantum Nodes Connected via the Quantum Cloud to Perform IoT Quantum Network 利用量子云连接的量子节点实现物联网量子网络

IF 1.7

Condensed Matter Pub Date : 2023-02-23 DOI: 10.3390/condmat8010024

Doaa Subhi, L. Bacsardi

{"title":"Using Quantum Nodes Connected via the Quantum Cloud to Perform IoT Quantum Network","authors":"Doaa Subhi, L. Bacsardi","doi":"10.3390/condmat8010024","DOIUrl":"https://doi.org/10.3390/condmat8010024","url":null,"abstract":"Computer networks consist of millions of nodes that need constant protection because of their continued vulnerability to attacks. Classical security methods for protecting such networks will not be effective enough if quantum computers become widespread. On the other hand, we can exploit the capabilities of quantum computing and communications to build a new quantum communication network. In this paper, we focused on enhancing the performance of the classical client–server Internet application. For this sake, we introduced a novel Internet of Things (IoT) quantum network that provides high security and Quality of Service (QoS) compared with the traditional IoT network. This can be achieved by adding quantum components to the traditional IoT network. Quantum counterpart nodes, channels, and servers are used. In order to establish a secure communication between the quantum nodes and the quantum server, we defined a new Communication Procedure (CP) for the suggested IoT quantum network. The currently available quantum computer has a small qubit size (from 50 to 433 qubits). The proposed IoT quantum network allows us to overcome this problem by concatenating the computation efforts of multiple quantum nodes (quantum processors).","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42975885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0