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Resonance quality, radiative/ohmic losses and modal volume of Mie plasmons Mie等离子体的共振质量、辐射/欧姆损耗和模态体积
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/47008
S. Derom, R. Vincent, A. Bouhelier, G. Colas des Francs
{"title":"Resonance quality, radiative/ohmic losses and modal volume of Mie plasmons","authors":"S. Derom, R. Vincent, A. Bouhelier, G. Colas des Francs","doi":"10.1209/0295-5075/98/47008","DOIUrl":"https://doi.org/10.1209/0295-5075/98/47008","url":null,"abstract":"Molecular sytems are efficiently coupled to metal nanoparticles via the excitation of localized surface plasmons-polaritons (SPPs). The coupling strength between SPP and emitters can be estimated from the ratio Q/V where Q and V refer to the mode quality factor and effective volume, respectively. In this letter, we investigate in details the properties of Mie plasmons supported by a metallic nanosphere (Q-factor, radiative and ohmic losses, modal volume). We particularly focus on the difficulty to unambiguously define the modal volumes of localized SPPs. This leads us to propose two definitions; the first one is based on Purcell factor for a dipolar emitter in close proximity to the metallic nanoparticle and the second one is adapted from cavity quantum electrodynamics concept (cQED). This work brings simple hand tools to characterize the main properties of localized SPPs and will be helpful in designing optical nanosources. It also makes a bridge between cQED and quantum plasmonics.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115998012","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: 30
Associative memory model with spontaneous neural activity 自发神经活动的联想记忆模型
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/48002
Tomoki Kurikawa, K. Kaneko
{"title":"Associative memory model with spontaneous neural activity","authors":"Tomoki Kurikawa, K. Kaneko","doi":"10.1209/0295-5075/98/48002","DOIUrl":"https://doi.org/10.1209/0295-5075/98/48002","url":null,"abstract":"We propose a novel associative memory model wherein the neural activity without an input (i.e., spontaneous activity) is modified by an input to generate a target response that is memorized for recall upon the same input. Suitable design of synaptic connections enables the model to memorize input/output (I/O) mappings equaling 70% of the total number of neurons, where the evoked activity distinguishes a target pattern from others. Spontaneous neural activity without an input shows chaotic dynamics but keeps some similarity with evoked activities, as reported in recent experimental studies.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124158604","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: 10
The effect of an infinite plane-wave approximation on calculations for second-harmonic generation in a one-dimensional nonlinear crystal 无限平面波近似对一维非线性晶体中二次谐波产生计算的影响
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/44004
Jing Zhao, Li-Ming Zhao
{"title":"The effect of an infinite plane-wave approximation on calculations for second-harmonic generation in a one-dimensional nonlinear crystal","authors":"Jing Zhao, Li-Ming Zhao","doi":"10.1209/0295-5075/98/44004","DOIUrl":"https://doi.org/10.1209/0295-5075/98/44004","url":null,"abstract":"In this paper, the second-harmonic generation (SHG) in a one-dimensional nonlinear crystal that is embedded in air is investigated. Previously, the identical configuration was studied in Li Z. Y. et al., Phys. Rev. B, 60 (1999) 10644, without the use of the slowly varying amplitude approximation (SVAA), but by adopting the infinite plane-wave approximation (PWA), despite the fact that this approximation is not quite applicable to such a system. We calculate the SHG conversion efficiency without a PWA, and compare the results with those from the quoted reference. The investigation reveals that conversion efficiencies of SHG as calculated by the two methods appear to exhibit significant differences, and that the SHG may be modulated by the field of a fundamental wave (FW). The ratio between SHG conversion efficiencies as produced by the two methods shows a periodic variation, and this oscillatory behavior is fully consistent with the variation in transmittance of the FW. Quasi-phase matching (QPM) is also studied, and we find that the location of the peak for SHG conversion efficiency deviates from Δd=0, which differs from the conventional QPM results.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124411438","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: 2
Magnetic phase transition and the spin excitations in cluster antiferromagnetic K0.8Fe1.6Se2 团簇反铁磁K0.8Fe1.6Se2的磁相变和自旋激发
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/47006
Huan Li, Yu Liu
{"title":"Magnetic phase transition and the spin excitations in cluster antiferromagnetic K0.8Fe1.6Se2","authors":"Huan Li, Yu Liu","doi":"10.1209/0295-5075/98/47006","DOIUrl":"https://doi.org/10.1209/0295-5075/98/47006","url":null,"abstract":"We have studied the magnetic phase diagram and magnetic properties of iron selenide K0.8Fe1.6Se2 using an effective spin-exchange model. By applying the bond-operator approach, we show that the Fe moments form a checkerboard antiferromagnetic structure in a wide range of parameter regions, and the phase boundary between the magnetic phase and the spin-disordered phase is calculated as a function of the exchange interactions. We also calculate the spin excitation spectrums as well as the predicted inelastic neutron scattering patterns of the checkerboard antiferromagnetic state within the spin-wave method.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128209804","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
Epitaxial growth and magnetic response of La0.8Ca0.2MnO3 thin films grown on ultrathin SrTiO3 buffered GaAs substrates 超薄SrTiO3缓冲GaAs衬底上La0.8Ca0.2MnO3薄膜的外延生长和磁响应
EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI: 10.1209/0295-5075/98/37001
Z. Wu, L. Wang, J. Gao
{"title":"Epitaxial growth and magnetic response of La0.8Ca0.2MnO3 thin films grown on ultrathin SrTiO3 buffered GaAs substrates","authors":"Z. Wu, L. Wang, J. Gao","doi":"10.1209/0295-5075/98/37001","DOIUrl":"https://doi.org/10.1209/0295-5075/98/37001","url":null,"abstract":"Colossal-magnetoresistance manganites La0.8Ca0.2MnO3 (LCMO) films were epitaxially grown on (001) GaAs substrates by pulsed-laser deposition. An ultrathin SrTiO3 (STO) film (∼10 nm) was used as a buffer layer to reduce the lattice mismatch and interdiffusion. The crystallinity and the growth mode were investigated using X-ray diffraction and reflective high-energy electron diffraction. The results indicate that LCMO is grown with a highly c-axis epitaxial feature depending on the STO buffer layer. The heterostructures exhibit good rectifying behavior in a wide temperature range from 50 K to 300 K with a paramagnetic-ferromagnetic transition at ∼200 K. Both the LCMO thin films and the LCMO/STO/GaAs heterojunctions showed magnetic response under the magnetic fields.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132858857","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
Dynamics of a nanoscale rotor driven by single-electron tunneling 单电子隧道驱动的纳米转子动力学
EPL (Europhysics Letters) Pub Date : 2012-04-26 DOI: 10.1209/0295-5075/98/68004
A. Croy, A. Eisfeld
{"title":"Dynamics of a nanoscale rotor driven by single-electron tunneling","authors":"A. Croy, A. Eisfeld","doi":"10.1209/0295-5075/98/68004","DOIUrl":"https://doi.org/10.1209/0295-5075/98/68004","url":null,"abstract":"We investigate theoretically the dynamics and the charge transport properties of a rod-shaped nanoscale rotor, which is driven by a similar mechanism as the nanomechanical single-electron transistor (NEMSET). We show that a static electric potential gradient can lead to self-excitation of oscillatory or continuous rotational motion. We identify the relevant parameters of the device and study the dependence of the dynamics on these parameters. We discuss how the dynamics are related to the measured current through the device. Notably, in the oscillatory regime we find a negative differential conductance. The current-voltage characteristics can be used to infer details of the surrounding environment which is responsible for damping.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133157547","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: 15
The dynamics of the DNA denaturation transition DNA变性转变的动力学
EPL (Europhysics Letters) Pub Date : 2012-04-25 DOI: 10.1209/0295-5075/98/48004
T. S. van Erp, M. Peyrard
{"title":"The dynamics of the DNA denaturation transition","authors":"T. S. van Erp, M. Peyrard","doi":"10.1209/0295-5075/98/48004","DOIUrl":"https://doi.org/10.1209/0295-5075/98/48004","url":null,"abstract":"The dynamics of the DNA denaturation is studied using the Peyrard-Bishop-Dauxois model. The denaturation rate of double stranded polymers decreases exponentially as a function of length below the denaturation temperature. Above Tc, the rate shows a minimum, but then increases as a function of length. We also examine the influence of sequence and solvent friction. Molecules having the same number of weak and strong base-pairs can have significantly different opening rates depending on the order of base-pairs.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128491084","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: 13
Bipolaron formation in organic semiconductors at the interface with dielectric gates 有机半导体中介电栅界面的双极化子形成
EPL (Europhysics Letters) Pub Date : 2012-04-23 DOI: 10.1209/0295-5075/98/47004
C. A. Perroni, V. Cataudella
{"title":"Bipolaron formation in organic semiconductors at the interface with dielectric gates","authors":"C. A. Perroni, V. Cataudella","doi":"10.1209/0295-5075/98/47004","DOIUrl":"https://doi.org/10.1209/0295-5075/98/47004","url":null,"abstract":"The formation of the electron-phonon–induced bipolaron is shown to be feasible in organic semiconductors at the interface with dielectric gates due to the coupling of the carriers with interface vibrational modes and to the weak to intermediate strength of bulk electron-electron interaction. The polaronic bound states are found to be quite robust in a model with realistic strengths of electron coupling to both bulk and interface phonons. The crossover to nearly on-site bipolarons occurs for coupling values much smaller than those for nearly on-site polarons, but, on the other hand, it gives rise to an activated behavior of mobility with much larger activation energies. The results are discussed in connection with rubrene field-effect transistors.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122231783","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: 2
Planck-scale effects on Bose-Einstein condensates 玻色-爱因斯坦凝聚体的普朗克尺度效应
EPL (Europhysics Letters) Pub Date : 2012-04-20 DOI: 10.1209/0295-5075/98/60001
F. Briscese, M. Grether, M. de Llano
{"title":"Planck-scale effects on Bose-Einstein condensates","authors":"F. Briscese, M. Grether, M. de Llano","doi":"10.1209/0295-5075/98/60001","DOIUrl":"https://doi.org/10.1209/0295-5075/98/60001","url":null,"abstract":"The effects of a Planck-scale deformation of the Minkowski energy-momentum dispersion relation on the phenomenology of non-trapped Bose-Einstein condensates (BECs) are examined. Such a deformation is shown to cause a shift in the condensation temperature Tc of the BEC and, for a specific functional form of deformation, this shift can be as large as the current measured precision on Tc. For a 8537Rb cold-atom BEC with a particle density n≃1012cm−3 we find a fractional shift of order 10−4, but this can be much larger for even more dilute BECs. We discuss the possibility of planning specific experiments with BECs that might provide phenomenological constraints on Planck-scale physics. These corrections to Tc are found to be extremely small for ultrarelativistic BECs implying that, in some cases, Planck-scale effects may be more important in low- rather than high-energy processes.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122650711","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: 13
Comment on “Topological quantum phase transitions of attractive spinless fermions in a honeycomb lattice” by Poletti D. et al. 对Poletti D. et al.“蜂窝晶格中吸引无自旋费米子的拓扑量子相变”的评论。
EPL (Europhysics Letters) Pub Date : 2012-04-20 DOI: 10.1209/0295-5075/98/27005
P. Corboz, Sylvain Capponi, Andreas M. Laeuchli, Bela Bauer, Román Orús
{"title":"Comment on “Topological quantum phase transitions of attractive spinless fermions in a honeycomb lattice” by Poletti D. et al.","authors":"P. Corboz, Sylvain Capponi, Andreas M. Laeuchli, Bela Bauer, Román Orús","doi":"10.1209/0295-5075/98/27005","DOIUrl":"https://doi.org/10.1209/0295-5075/98/27005","url":null,"abstract":"In a recent letter [D. Poletti et al., EPL 93, 37008 (2011)] a model of attractive spinless fermions on the honeycomb lattice at half filling has been studied by mean-field theory, where distinct homogenous phases at rather large attraction strength $V>3.36$, separated by (topological) phase transitions, have been predicted. In this comment we argue that without additional interactions the ground states in these phases are not stable against phase separation. We determine the onset of phase separation at half filling $V_{ps}approx 1.7$ by means of infinite projected entangled-pair states (iPEPS) and exact diagonalization.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115056892","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: 6
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