Pub Date : 2024-05-22DOI: 10.1209/0295-5075/ad4f0e
Huiqin Cui, Shijiao Zheng, Zhiyi Zhang, Bo Chen, Yong-Jia Zhang, Jie Li, Juanfen Wang, Lin Xue, Longlong Zhang
Two-dimensional (2D) Bi2O2Se has been widely used as optoelectronic detectors due to its excellent carrier mobility and environmental stability. However, the synthesis of the p-type Bi2O2Se remains challenging which hinders its further applications. In this paper, we have investigated the electronic properties of the native point defects and the Ca/Cd-doping effects on Bi2O2Se using first-principles calculations. The results indicate that Se vacancy (VSe) and O vacancy (VO) are shallow donors, which lead to the n-type Bi2O2Se semiconductor. Ca substituting Bi (CaBi) and Cd substituting Bi (CdBi) are accepters and can compensate the n-type behavior of shallow donors. The compensation effect of CdBi is weaker than that of CaBi due to its higher formation energies. Additionally, the calculation results of the Fermi level, defect and carrier concentrations indicate that CaBi shifts the Fermi level towards the valence band maximum (VBM), however, it is not sufficient to convert Bi2O2Se into the p-type.
二维（2D）Bi2O2Se 具有出色的载流子迁移率和环境稳定性，已被广泛用作光电探测器。然而，p 型 Bi2O2Se 的合成仍然具有挑战性，这阻碍了它的进一步应用。在本文中，我们利用第一原理计算研究了 Bi2O2Se 上原生点缺陷的电子特性以及 Ca/Cd 掺杂效应。结果表明，Se 空位（VSe）和 O 空位（VO）是浅供体，它们导致了 n 型 Bi2O2Se 半导体。钙替代铋（CaBi）和镉替代铋（CdBi）是受体，可以补偿浅供体的 n 型行为。由于 CdBi 的形成能量较高，其补偿效应弱于 CaBi。此外，费米级、缺陷和载流子浓度的计算结果表明，CaBi 使费米级向价带最大值（VBM）移动，但这不足以将 Bi2O2Se 转变为 p 型。
{"title":"The p-type modulation of Bi2O2Se by Ca and Cd doping","authors":"Huiqin Cui, Shijiao Zheng, Zhiyi Zhang, Bo Chen, Yong-Jia Zhang, Jie Li, Juanfen Wang, Lin Xue, Longlong Zhang","doi":"10.1209/0295-5075/ad4f0e","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4f0e","url":null,"abstract":"\u0000 Two-dimensional (2D) Bi2O2Se has been widely used as optoelectronic detectors due to its excellent carrier mobility and environmental stability. However, the synthesis of the p-type Bi2O2Se remains challenging which hinders its further applications. In this paper, we have investigated the electronic properties of the native point defects and the Ca/Cd-doping effects on Bi2O2Se using first-principles calculations. The results indicate that Se vacancy (VSe) and O vacancy (VO) are shallow donors, which lead to the n-type Bi2O2Se semiconductor. Ca substituting Bi (CaBi) and Cd substituting Bi (CdBi) are accepters and can compensate the n-type behavior of shallow donors. The compensation effect of CdBi is weaker than that of CaBi due to its higher formation energies. Additionally, the calculation results of the Fermi level, defect and carrier concentrations indicate that CaBi shifts the Fermi level towards the valence band maximum (VBM), however, it is not sufficient to convert Bi2O2Se into the p-type.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"55 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141109280","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}
Pub Date : 2024-05-21DOI: 10.1209/0295-5075/ad4e63
S. Chiangga, T. Sunpatanon, T. Frank
An analytical method is developed that can be applied to a large variety of optomechanical systems to study entanglement between two subsystems of interest. The method is based on a system parameter that can be considered as perturbation parameter. It is shown that the method allows researchers to draw both qualitative and quantitative conclusions about the perturbation parameter at hand. First, the conclusion can be drawn whether or not the parameter when scaled up slightly induces entanglement between the subsystems. Second, physical insights into the role of model parameters for the emergence of entanglement can be obtained based on the perturbation theoretical analytical expressions. Third, quantitative predictions of numerical simulations that so far dominate the literature in the field of optomechanical entanglement can be validated at least in the limit of the vanishing perturbation parameter.
{"title":"Perturbation theoretical approach to determine optomechanical entanglement in mirror-field systems","authors":"S. Chiangga, T. Sunpatanon, T. Frank","doi":"10.1209/0295-5075/ad4e63","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4e63","url":null,"abstract":"\u0000 An analytical method is developed that can be applied to a large variety of optomechanical systems to study entanglement between two subsystems of interest. The method is based on a system parameter that can be considered as perturbation parameter. It is shown that the method allows researchers to draw both qualitative and quantitative conclusions about the perturbation parameter at hand. First, the conclusion can be drawn whether or not the parameter when scaled up slightly induces entanglement between the subsystems. Second, physical insights into the role of model parameters for the emergence of entanglement can be obtained based on the perturbation theoretical analytical expressions. Third, quantitative predictions of numerical simulations that so far dominate the literature in the field of optomechanical entanglement can be validated at least in the limit of the vanishing perturbation parameter.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"91 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141116526","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}
Pub Date : 2024-05-21DOI: 10.1209/0295-5075/ad4e61
Junbiao Lu, Liming Zhang, Haihong Li, Qionglin Dai, Junzhong Yang
When individuals or companies are unable to meet their financial obligations, they may undergo the process of bankruptcy and go out of business. At the same time, new companies may arise. In this work, we propose a coevolutionary game model incorporated with bankruptcy. In the model, each agent represents a company. Two factors, accumulated payoff and age, are taken into account to determine its bankrupt probability. We assume two possible bankrupt mechanisms, procedural bankruptcy and age-dependent bankruptcy. Through numerical simulations, we show that the bankruptcy can effectively promote cooperation. Moreover, we find the non-monotonic behavior of the cooperation level with the increase of noise intensity in procedural bankruptcy. By investigating the strategy patterns and the distributions of the bankruptcy probabilities for cooperators and defectors, we provide explanations for the promotion of cooperation and the optimization of the cooperation level. This work highlights the positive effects of bankruptcy mechanism on cooperation in the real business world.
{"title":"Bankruptcy mechanism based on accumulated payoff and age promotes cooperation in coevolutionary games","authors":"Junbiao Lu, Liming Zhang, Haihong Li, Qionglin Dai, Junzhong Yang","doi":"10.1209/0295-5075/ad4e61","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4e61","url":null,"abstract":"\u0000 When individuals or companies are unable to meet their financial obligations, they may undergo the process of bankruptcy and go out of business. At the same time, new companies may arise. In this work, we propose a coevolutionary game model incorporated with bankruptcy. In the model, each agent represents a company. Two factors, accumulated payoff and age, are taken into account to determine its bankrupt probability. We assume two possible bankrupt mechanisms, procedural bankruptcy and age-dependent bankruptcy. Through numerical simulations, we show that the bankruptcy can effectively promote cooperation. Moreover, we find the non-monotonic behavior of the cooperation level with the increase of noise intensity in procedural bankruptcy. By investigating the strategy patterns and the distributions of the bankruptcy probabilities for cooperators and defectors, we provide explanations for the promotion of cooperation and the optimization of the cooperation level. This work highlights the positive effects of bankruptcy mechanism on cooperation in the real business world.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"80 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141116918","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}
Pub Date : 2024-05-21DOI: 10.1209/0295-5075/ad4e62
A. Thiaville, J. Miltat
The fine structure and dynamics of magnetic domain walls in ultrathin films with perpendicular magnetization, in presence of a secondary anisotropy, is analysed owing to micro-magnetics. Two cases are considered, a cubic anisotropy typical for (111) oriented garnet epitaxial films, and an orthorhombic anisotropy as found in e.g. Co/W(110) films. The statics is solved first, showing that, in general, domain walls are not of the pure Bloch type. The dynamics under the spin Hall effect induced by a current flowing in an adjacent layer is then monitored. Finite and non-negligible domain wall velocities are predicted in both cases, in the absence of Dzyaloshinskii-Moriya interactions, with distinct behaviours regarding the current density and its orientation with respect to the secondary anisotropy axes. The relevance of these results to recent reports of current driven domain wall dynamics in insulating ultrathin garnet films, capped with platinum, is discussed.
{"title":"Spin-orbit torque driven domain wall motion in the absence of Dzyaloshinskii-Moriya interactions","authors":"A. Thiaville, J. Miltat","doi":"10.1209/0295-5075/ad4e62","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4e62","url":null,"abstract":"\u0000 The fine structure and dynamics of magnetic domain walls in ultrathin films with perpendicular magnetization, in presence of a secondary anisotropy, is analysed owing to micro-magnetics. Two cases are considered, a cubic anisotropy typical for (111) oriented garnet epitaxial films, and an orthorhombic anisotropy as found in e.g. Co/W(110) films. The statics is solved first, showing that, in general, domain walls are not of the pure Bloch type. The dynamics under the spin Hall effect induced by a current flowing in an adjacent layer is then monitored. Finite and non-negligible domain wall velocities are predicted in both cases, in the absence of Dzyaloshinskii-Moriya interactions, with distinct behaviours regarding the current density and its orientation with respect to the secondary anisotropy axes. The relevance of these results to recent reports of current driven domain wall dynamics in insulating ultrathin garnet films, capped with platinum, is discussed.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"138 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141114827","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}
In this study, we propose a group formation model by assuming voters hold asymmetric irrationality, namely the probability of accepting a candidate with whom they disagree with. Moreover, we utilize a non-Markovian function by introducing a rationality decay rate to represent that agents' rationality decays as their contributed admissions on the candidate increase. We have systematically explored the impact of non-Markovian asymmetric irrationality, voter selection mechanisms, voter number, and group size on the degree of consensus. Our findings indicate that, with only one voter, as the group size increases, the degree of consensus converges to a value determined by the irrationality ratio. Remarkably, even in scenarios with significant asymmetry in irrationality, a substantial degree of consensus can still be maintained. Furthermore, for multiple voters, the relationship between the degree of group consensus and rationality decay rate exhibits non-monotonic behaviors. In summary, this research offers new theoretical insights into group dynamics and provides implications for enhancing consensus in real-world social groups.
{"title":"Group consensus under asymmetric voting behavior","authors":"Hao Yu, Zhehang Xu, Youjin Wen, Pingle Yang, Jianlin Zhang, Fanyuan Meng","doi":"10.1209/0295-5075/ad4c92","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4c92","url":null,"abstract":"\u0000 In this study, we propose a group formation model by assuming voters hold asymmetric irrationality, namely the probability of accepting a candidate with whom they disagree with. Moreover, we utilize a non-Markovian function by introducing a rationality decay rate to represent that agents' rationality decays as their contributed admissions on the candidate increase. We have systematically explored the impact of non-Markovian asymmetric irrationality, voter selection mechanisms, voter number, and group size on the degree of consensus. Our findings indicate that, with only one voter, as the group size increases, the degree of consensus converges to a value determined by the irrationality ratio. Remarkably, even in scenarios with significant asymmetry in irrationality, a substantial degree of consensus can still be maintained. Furthermore, for multiple voters, the relationship between the degree of group consensus and rationality decay rate exhibits non-monotonic behaviors. In summary, this research offers new theoretical insights into group dynamics and provides implications for enhancing consensus in real-world social groups.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"23 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140968443","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}
Pub Date : 2024-05-15DOI: 10.1209/0295-5075/ad4c04
Hoda Abdolalizadeh, E. Aydiner
In this study, using von Neumann entropy we examine the entanglement entropy for the neutrino oscillations in the presence of the subsequent phase shift. We numerically show that the entanglement entropy for the subsequent periods of the two-flavor neutrino oscillations increases asymmetrically with time depending on the space-time deformation. We also explored the obtained results for the three-flavor neutrino oscillations to show that this result is also valid for the three-flavor neutrino oscillations. These results, obtained for the first time in this study, are quite different from the computing for the standard neutrino oscillation theory. We concluded that these interesting results play an important role in the cosmology.
{"title":"Quantum entanglement between neutrino eigenstates in the presence of the subsequent phase shift of the neutrino oscillations","authors":"Hoda Abdolalizadeh, E. Aydiner","doi":"10.1209/0295-5075/ad4c04","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4c04","url":null,"abstract":"\u0000 In this study, using von Neumann entropy we examine the entanglement entropy for the neutrino oscillations in the presence of the subsequent phase shift. We numerically show that the entanglement entropy for the subsequent periods of the two-flavor neutrino oscillations increases asymmetrically with time depending on the space-time deformation. We also explored the obtained results for the three-flavor neutrino oscillations to show that this result is also valid for the three-flavor neutrino oscillations. These results, obtained for the first time in this study, are quite different from the computing for the standard neutrino oscillation theory. We concluded that these interesting results play an important role in the cosmology.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"45 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973023","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}
Pub Date : 2024-05-15DOI: 10.1209/0295-5075/ad4c03
Xiaolong Yan, Xuechao Li, Yawen Cai
We studied the effects of hydrostatic pressure and temperature on the second and third harmonic generation (SHG and THG) of nonlinear optics semi-parabolic GaAs/Al0.3Ga0.7As quantum well. By solving the Schrödinger equation numerically, we can determine the system's subband energy levels and propagation wave functions, and then calculate its optical gain. The numerical simulation results show that both temperature and hydrostatic pressure can effectively improve the nonlinear optical performance of the system. As an interesting observation, we studied the mechanism of the two in this process. These findings highlight a feasible method to adjust the nonlinear optical performance of GaAs/Al0.3Ga0.7As quantum system through the subtle interaction between hydrostatic pressure, temperature and structural parameters.
{"title":"Dynamics of the nonlinear optical second, and third harmonic generation in GaAs/Ga0.7Al0.3As quantum well due to hydrostatic pressure and temperature","authors":"Xiaolong Yan, Xuechao Li, Yawen Cai","doi":"10.1209/0295-5075/ad4c03","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4c03","url":null,"abstract":"\u0000 We studied the effects of hydrostatic pressure and temperature on the second and third harmonic generation (SHG and THG) of nonlinear optics semi-parabolic GaAs/Al0.3Ga0.7As quantum well. By solving the Schrödinger equation numerically, we can determine the system's subband energy levels and propagation wave functions, and then calculate its optical gain. The numerical simulation results show that both temperature and hydrostatic pressure can effectively improve the nonlinear optical performance of the system. As an interesting observation, we studied the mechanism of the two in this process. These findings highlight a feasible method to adjust the nonlinear optical performance of GaAs/Al0.3Ga0.7As quantum system through the subtle interaction between hydrostatic pressure, temperature and structural parameters.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"57 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974510","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}
Pub Date : 2024-05-14DOI: 10.1209/0295-5075/ad4b99
Léonie Dagoudo, F. A. Dossa, G. Y. Avossevou
The dynamics of a particle carrying a non-abelian charge is studied in the presence of a minimal length. By choosing an appropriate non-abelian gauge field, the system identifies with the Hamiltonian of the Jaynes Cummings model whose solutions can be determined algebraically. The model has an underlying graded Lie algebra symmetry reminiscent of supersymmetric quantum mechanics. We calculate the energy levels and associated eigenstates using conservation of the number of excitations of the system. Then, we present the effect of the minimal length on the dynamics of the system and we are particularly interested in two particular cases, that of Rabi oscillations and that of the collapse-revival of the wave function. The results show that the higher the deformation parameter, the faster the oscillatory behavior of the atomic inversion.
{"title":"Spin-charged point particle in a non-abelian external field with the generalized uncertainty relation","authors":"Léonie Dagoudo, F. A. Dossa, G. Y. Avossevou","doi":"10.1209/0295-5075/ad4b99","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4b99","url":null,"abstract":"\u0000 The dynamics of a particle carrying a non-abelian charge is studied in the presence of a minimal length. By choosing an appropriate non-abelian gauge field, the system identifies with the Hamiltonian of the Jaynes Cummings model whose solutions can be determined algebraically. The model has an underlying graded Lie algebra symmetry reminiscent of supersymmetric quantum mechanics. We calculate the energy levels and associated eigenstates using conservation of the number of excitations of the system. Then, we present the effect of the minimal length on the dynamics of the system and we are particularly interested in two particular cases, that of Rabi oscillations and that of the collapse-revival of the wave function. The results show that the higher the deformation parameter, the faster the oscillatory behavior of the atomic inversion.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"33 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140980391","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}
Pub Date : 2024-05-13DOI: 10.1209/0295-5075/ad4ac0
Xiangke Li, Jinlong Luo, Hai Yang, Guojun Jin
The Rashba spin-splitting and thermoelectric transport of two-dimensional black arsenic phosphorus (2D B-AsP) under strain control are studied using non-equilibrium Green’s function and first principles calculations. Firstly, we determine the stability range of 2D B-AsP under strain conditions, with biaxial strain ranging from −2% to +5% and uniaxial strain ranging from −4% to +5%. Secondly, we analyze at the point Γ under strain within the range of −1% to +2%, and find the spin-splitting coefficient decreases with increasing strain. Thirdly, we discuss the effects of applying strain and changing temperature on 2D B-AsP thermoelectric transport. When the uniaxial compression strain is −4%, the ZT coefficient increases by 12.91%, and increases by 48.8% at a temperature of 400 K. Finally, when two external conditions exist simultaneously, the ZT coefficient of the material increases by 44.6%. The research results demonstrate the potential applications of 2D B-AsP in spintronics and thermoelectricity.
{"title":"Thermoelectric transport and Rashba spin-splitting of black arsenic phosphorus under strain regulation","authors":"Xiangke Li, Jinlong Luo, Hai Yang, Guojun Jin","doi":"10.1209/0295-5075/ad4ac0","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4ac0","url":null,"abstract":"\u0000 The Rashba spin-splitting and thermoelectric transport of two-dimensional black arsenic phosphorus (2D B-AsP) under strain control are studied using non-equilibrium Green’s function and first principles calculations. Firstly, we determine the stability range of 2D B-AsP under strain conditions, with biaxial strain ranging from −2% to +5% and uniaxial strain ranging from −4% to +5%. Secondly, we analyze at the point Γ under strain within the range of −1% to +2%, and find the spin-splitting coefficient decreases with increasing strain. Thirdly, we discuss the effects of applying strain and changing temperature on 2D B-AsP thermoelectric transport. When the uniaxial compression strain is −4%, the ZT coefficient increases by 12.91%, and increases by 48.8% at a temperature of 400 K. Finally, when two external conditions exist simultaneously, the ZT coefficient of the material increases by 44.6%. The research results demonstrate the potential applications of 2D B-AsP in spintronics and thermoelectricity.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"3 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140983297","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}
Pub Date : 2024-05-13DOI: 10.1209/0295-5075/ad4ac1
Zi-An Li, X. Huo, C. C. Cheng, Xue-Shen Liu
We investigate theoretically the ellipticity of the high-order harmonic generation from the molecule H+2 by utilizing two-color cross-linearly polarized laser fields. A significant region of the large ellipticity can be achieved by adjusting the crossing angle and the relative phase between the two laser fields. By controlling the short trajectory, we can obtain the smoother harmonic spectrum. The minimum value observed in the plateau region can be attributed to the two-center interference of the molecule. Furthermore, we investigate the contribution of the two-center interference to the ellipticity of HHG. The underlying physical mechanisms of the ellipticity can be demonstrated by the phase difference and amplitude difference of the x and y components of the harmonics. As a result, we synthesized an isolated attosecond pulse with an ellipticity of 0.98.
我们利用双色交叉线性偏振激光束从理论上研究了分子 H+2 产生的高阶谐波的椭圆度。通过调整两个激光束之间的交叉角和相对相位，可以获得显著的大椭圆度区域。通过控制短轨迹，我们可以获得更平滑的谐波频谱。在高原区观察到的最小值可归因于分子的双中心干涉。此外，我们还研究了双中心干涉对 HHG 椭圆性的贡献。椭圆性的基本物理机制可以通过谐波的 x 和 y 分量的相位差和振幅差来证明。因此，我们合成了一个椭圆度为 0.98 的孤立阿秒脉冲。
{"title":"Generation of near-circularly polarized high-order harmonics in two-color cross-linearly polarized laser fields","authors":"Zi-An Li, X. Huo, C. C. Cheng, Xue-Shen Liu","doi":"10.1209/0295-5075/ad4ac1","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4ac1","url":null,"abstract":"\u0000 We investigate theoretically the ellipticity of the high-order harmonic generation from the molecule H+2 by utilizing two-color cross-linearly polarized laser fields. A significant region of the large ellipticity can be achieved by adjusting the crossing angle and the relative phase between the two laser fields. By controlling the short trajectory, we can obtain the smoother harmonic spectrum. The minimum value observed in the plateau region can be attributed to the two-center interference of the molecule. Furthermore, we investigate the contribution of the two-center interference to the ellipticity of HHG. The underlying physical mechanisms of the ellipticity can be demonstrated by the phase difference and amplitude difference of the x and y components of the harmonics. As a result, we synthesized an isolated attosecond pulse with an ellipticity of 0.98.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"30 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140982808","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}
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