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Validation of optical conductivity and tailing parameter 光导率和尾迹参数的验证
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-26 DOI: 10.1209/0295-5075/ad69be
Arbab I. Arbab and Fatma O. Sherfee
{"title":"Validation of optical conductivity and tailing parameter","authors":"Arbab I. Arbab and Fatma O. Sherfee","doi":"10.1209/0295-5075/ad69be","DOIUrl":"https://doi.org/10.1209/0295-5075/ad69be","url":null,"abstract":"A quantum model for optical conductivity that treats light as a particle is presented. Based on this assumption, the optical characteristics of the material are calculated and compared to experimental findings. The band gap energy of a material changes with frequency and refractive index. We provided an equation of the line extrapolated in the Tauc plot. The obtained formula for optical conductivity reveals that the band tailing parameter in the Tauc formula is dependent on the speed of light, the Planck constant, and the material's refractive index. The determination of this constant helps establish the value of the band. The values of this constant are found to be consistent with various experimental results. Two electric conductivities distinguishing Abraham and Minkoswi's light momentum relationship inside materials are proposed.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"265 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Vortex formation driven by the particle flow at the interface of a phase-separated binary complex plasma under microgravity condition 微重力条件下二元复合等离子体相分离界面粒子流驱动的涡流形成
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-26 DOI: 10.1209/0295-5075/ad6bbd
Sheng Pan, Wei Yang, Andrey M. Lipaev, Andrey V. Zobnin, Deng-Hui Li, Shan Chang, Anton N. Shkaplerov, Sergey V. Prokopyev, Markus Thoma and Cheng-Ran Du
{"title":"Vortex formation driven by the particle flow at the interface of a phase-separated binary complex plasma under microgravity condition","authors":"Sheng Pan, Wei Yang, Andrey M. Lipaev, Andrey V. Zobnin, Deng-Hui Li, Shan Chang, Anton N. Shkaplerov, Sergey V. Prokopyev, Markus Thoma and Cheng-Ran Du","doi":"10.1209/0295-5075/ad6bbd","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6bbd","url":null,"abstract":"Microparticles of two sizes are confined in a dc discharge in a glass tube with polarity switch in the PK-4 laboratory on board the International Space Station. Small and big particles separate from each other presumably due to the unbalance of the force under microgravity condition, forming an ellipsoidal interface. Particles close to the symmetric axis of the cylindrical glass tube are driven by a manipulation laser and a particle flow is generated. The flow velocity depends not only on the laser current but also on the configuration and location of the particle cloud. Counterintuitively, it is observed that a vortex can be formed at the interface, only if the flow velocity is below a certain critical value. Our experiments provide a great opportunity to study the new facets of vortex formation at particle-resolved level.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"10 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Operator growth and spread complexity in open quantum systems 开放量子系统中的算子增长和扩散复杂性
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-21 DOI: 10.1209/0295-5075/ad5b17
Eoin Carolan, Anthony Kiely, Steve Campbell and Sebastian Deffner
{"title":"Operator growth and spread complexity in open quantum systems","authors":"Eoin Carolan, Anthony Kiely, Steve Campbell and Sebastian Deffner","doi":"10.1209/0295-5075/ad5b17","DOIUrl":"https://doi.org/10.1209/0295-5075/ad5b17","url":null,"abstract":"Commonly, the notion of “quantum chaos” refers to the fast scrambling of information throughout complex quantum systems undergoing unitary evolution. Motivated by the Krylov complexity and the operator growth hypothesis, we demonstrate that the entropy of the population distribution for an operator in time is a useful way to capture the complexity of the internal information dynamics of a system when subject to an environment and is, in principle, agnostic to the specific choice of operator basis. We demonstrate its effectiveness for the Sachdev-Ye-Kitaev (SYK) model, examining the dynamics of the system in both its Krylov basis and the basis of operator strings. We prove that the former basis minimises spread complexity while the latter is an eigenbasis for high dissipation. In both cases, we probe the long-time dynamics of the model and the phenomenological effects of decoherence on the complexity of the dynamics.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"58 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
A lightweight attention-based multi-frequency topology learning framework for driving fatigue detection 用于驾驶疲劳检测的基于注意力的轻量级多频拓扑学习框架
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-21 DOI: 10.1209/0295-5075/ad602f
DongMei Lv, WeiDong Dang, LiLi Xia, ZhongKe Gao and Celso Grebogi
{"title":"A lightweight attention-based multi-frequency topology learning framework for driving fatigue detection","authors":"DongMei Lv, WeiDong Dang, LiLi Xia, ZhongKe Gao and Celso Grebogi","doi":"10.1209/0295-5075/ad602f","DOIUrl":"https://doi.org/10.1209/0295-5075/ad602f","url":null,"abstract":"Driving fatigue has been one of the major causes of traffic accident. Efficient and accurate detection of driving fatigue are a legitimate public concern. In this paper, we conduct the simulated driving experiments and an EEG-based driving fatigue detection framework integrating multilayer brain network and convolutional neural network (CNN) is developed. This lightweight attention-based multi-frequency topology learning (AMFTL) framework first captures the fatigue-related multi-frequency brain topological information and then feeds it into a CNN-based topology feature extraction (TFE) module to fully explore and integrate the critical topological features. The quantitative analysis results show that there are significant differences in brain topologies between the alert and fatigue states. And experimental results show that our proposed framework achieves an average detection accuracy of 94.71% for driving fatigue, which outperforms the current state-of-the-art methods. This proposed framework is expected to open new venues for EEG-based brain state analysis, and holds promising practical application potential.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"105 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Influence of anti-ferromagnetic ordering and electron correlation on the electronic structure of MnTiO3 反铁磁有序和电子相关对 MnTiO3 电子结构的影响
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-21 DOI: 10.1209/0295-5075/ad6bbb
Asif Ali, R. K. Maurya, Sakshi Bansal, B. H. Reddy and Ravi Shankar Singh
{"title":"Influence of anti-ferromagnetic ordering and electron correlation on the electronic structure of MnTiO3","authors":"Asif Ali, R. K. Maurya, Sakshi Bansal, B. H. Reddy and Ravi Shankar Singh","doi":"10.1209/0295-5075/ad6bbb","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6bbb","url":null,"abstract":"Electron correlation and long-range magnetic ordering have a significant impact on the electronic structure and physical properties of solids. Here, we investigate the electronic structure of ilmenite MnTiO3 using room temperature photoemission spectroscopy and theoretical approaches within density functional theory (DFT), DFT+ U and DFT+dynamical mean-field theory (DMFT). Mn 2p (Ti 2p) core level photoemission spectra, confirming Mn2+ (Ti4+) oxidation state, exhibit multiple satellites which are very similar to that of MnO (TiO2), suggesting similar strength of various interactions in this system. Valence band spectra collected at different photon energies suggest dominant Mn 3d character in the highest occupied band with a wide insulating gap. DFT(+ U) correctly predicts the experimentally observed anti-ferromagnetic (AFM) insulating ground state for MnTiO3 where the requirement of a large U to reproduce the experimental values of magnetic moment and band gap signifies the importance of electron correlation. Magnetically disordered paramagnetic (PM) phase could be well captured within DFT+DMFT, which provides an excellent agreement for the experimental band gap, paramagnetic moment, valence band spectra as well as dominant Mn 3d character in the highest occupied band. The calculated spectral function remains largely unaffected and exhibits sharper features in the magnetically ordered AFM phase. We show that the electronic structure of MnTiO3 in both the PM and AFM phases can be accurately described within DFT+DMFT.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"43 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Extracting work from two gravitational cat states 从两种引力猫状态中提取功
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-20 DOI: 10.1209/0295-5075/ad6030
Maryam Hadipour and Soroush Haseli
{"title":"Extracting work from two gravitational cat states","authors":"Maryam Hadipour and Soroush Haseli","doi":"10.1209/0295-5075/ad6030","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6030","url":null,"abstract":"Gravitational cat states in the context of gravity are superpositions of quantum states that exhibit macroscopically distinct gravitational fields. These states represent a unique blend of quantum mechanics and general relativity, providing insights into the behavior of quantum systems under gravitational influences. This study investigates the impact of thermal environments on the extractable work from gravitational cat states, which are quantum superpositions of distinct gravitational configurations. It aims to offer a comprehensive analysis of how temperature and gravitational interactions between states with masses m influence work extraction. The findings indicate that both an increase in temperature and the interactions between states reduce the amount of work that can be extracted from gravitational cat states, highlighting the delicate balance between thermal and gravitational effects in quantum systems.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"7 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Both orbital and spin torques originate from r × g 轨道力矩和自旋力矩都源自 r × g
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-20 DOI: 10.1209/0295-5075/ad6801
Frances Crimin and Stephen M. Barnett
{"title":"Both orbital and spin torques originate from r × g","authors":"Frances Crimin and Stephen M. Barnett","doi":"10.1209/0295-5075/ad6801","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6801","url":null,"abstract":"Does the cross-product of the position and the electromagnetic momentum density, g, include the optical spin momentum? We answer this long-standing question in the affirmative by evaluating, explicitly, the torque exerted on a particle by a beam of light carrying angular momentum.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"3 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
On the Einstein-de Haas effect in van der Waals microelectromechanical systems 范德华微机电系统中的爱因斯坦-德哈斯效应
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-20 DOI: 10.1209/0295-5075/ad5c98
Maksim A. Koliushenkov and Alexander P. Pyatakov
{"title":"On the Einstein-de Haas effect in van der Waals microelectromechanical systems","authors":"Maksim A. Koliushenkov and Alexander P. Pyatakov","doi":"10.1209/0295-5075/ad5c98","DOIUrl":"https://doi.org/10.1209/0295-5075/ad5c98","url":null,"abstract":"The electric-field–induced gyromagnetic effect in antiferromagnetic 2D films, analogous to the classical Einstein-de Haas effect in ferromagnetic materials, is considered. It is shown that for the micrometer-sized flakes of antiferromagnetic van der Waals materials having a non-diagonal tensor of the magnetoelectric effect, the magnitude of the electrically induced Einstein-de Haas effect is sufficient to be detected with the conventional optical lever approach of an atomic force microscope.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"48 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Muon ring and FCC-ee/CEPC based antimuon-electron colliders 基于μ介子环和 FCC-ee/CEPC 的反μ介子-电子对撞机
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-20 DOI: 10.1209/0295-5075/ad5e1a
Dilara Akturk, Burak Dagli and Saleh Sultansoy
{"title":"Muon ring and FCC-ee/CEPC based antimuon-electron colliders","authors":"Dilara Akturk, Burak Dagli and Saleh Sultansoy","doi":"10.1209/0295-5075/ad5e1a","DOIUrl":"https://doi.org/10.1209/0295-5075/ad5e1a","url":null,"abstract":"Recently, the construction of an antimuon-electron collider, μTRISTAN, at KEK has been proposed. We argue that the construction of a similar muon ring tangential to FCC-ee and CEPC will give an opportunity to realize antimuon-electron collisions at higher center-of-mass energies. Moreover, the same ring may be used later to realize energy-frontier antimuon-proton colliders based on FCC-pp and SppC. Similarly, the change of the electron ring in the μTRISTAN project into the proton ring will give the opportunity to investigate lepton-hadron collisions at ∼2 TeV center-of-mass energies. In this paper the main parameters of the proposed colliders have been studied. It is shown that sufficiently high luminosities can be achieved for all proposals under consideration.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"8 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Nonlinear response theory of molecular machines 分子机器的非线性响应理论
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-20 DOI: 10.1209/0295-5075/ad6a7e
Michalis Chatzittofi, Jaime Agudo-Canalejo and Ramin Golestanian
{"title":"Nonlinear response theory of molecular machines","authors":"Michalis Chatzittofi, Jaime Agudo-Canalejo and Ramin Golestanian","doi":"10.1209/0295-5075/ad6a7e","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6a7e","url":null,"abstract":"Chemical affinities are responsible for driving active matter systems out of equilibrium. At the nano-scale, molecular machines interact with the surrounding environment and are subjected to external forces. The mechano-chemical coupling which arises naturally in these systems reveals a complex interplay between chemical and mechanical degrees of freedom with strong impact on their active mechanism. By considering various models far from equilibrium, we show that the tuning of applied forces gives rise to a nonlinear response that causes a non-monotonic behaviour in the machines’ activity. Our findings have implications in understanding, designing, and triggering such processes by controlled application of external fields, including the collective dynamics of larger non-equilibrium systems where the total dissipation and performance might be affected by internal and inter-particle interactions.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"58 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
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