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A quadrupole oscillator as an integrable model 作为可积分模型的四极振荡器
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-05 DOI: 10.1016/j.physleta.2024.130032
A quadrupole oscillator is presented as an integrable model in the Born-Oppenheimer formalism with an electronic Hamiltonian being the quadrupole tensor. The electronic states of present concern are associated with a doubly degenerate positive eigenvalue of the electronic Hamiltonian, and accordingly the nuclear Hamiltonian takes a 2×2 matrix form. While the potential function for nuclear motion is proportional to r2, the kinetic energy operator is rather complicated, containing coupling terms with a Berry connection through adiabatic approximation. The energy eigenvalues, which receive a modification by a Chern number, get closer to those for the 3D isotropic harmonic oscillator if the angular momentum quantum number becomes sufficiently large.
在玻恩-奥本海默形式主义中,四极振荡器是一个可积分模型,其电子哈密顿是四极张量。目前关注的电子态与电子哈密顿的双变性正特征值有关,因此核哈密顿采用 2×2 矩阵形式。核运动的势函数与 r2 成正比,而动能算子则相当复杂,通过绝热近似,包含了与贝里联系的耦合项。如果角动量量子数变得足够大,能量特征值就会变得更接近三维各向同性谐振子的能量特征值。
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引用次数: 0
Triple and quadruple metal gate work function engineering to improve the performance of junctionless double surrounding gate In0.53Ga0.47As nanotube MOSFET for the upcoming Sub 3 nm technology node 利用三重和四重金属栅极功函数工程提高无结双环绕栅极 In0.53Ga0.47As 纳米管 MOSFET 的性能,以适应即将到来的 3 纳米以下技术节点的要求
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-31 DOI: 10.1016/j.physleta.2024.130011
In line with Moore's Law and the International Roadmap for Devices and Systems (IDRS), shrinking MOSFET dimensions to the 3 nm technology node requires the introduction and thorough investigation of new device structures and advanced materials. The current study focuses on the implementation of Triple Metal (TM) and Quadruple Metal (QM) gate work function engineering techniques on both junctionless (JL) and inversion mode (IM) Double surrounding Gate (DSG) In0.53Ga0.47As nanotube (NT) MOSFET. The objective is to analyze the drain current (ID) characteristics for a gate length of 3 nm using Silvaco ATLAS 3D TCAD. In order to make a fair comparison between JL and IM In0.53Ga0.47As NT, the doping concentration of TM and QM JL In0.53Ga0.47As NT is tuned to achieve two specific objectives. Firstly, the goal is to produce the same ION as IM In0.53Ga0.47As NT. Secondly, the aim is to achieve the same threshold voltage (VTH) as IM In0.53Ga0.47As NT. It was discovered that the IOFF for JL devices is approximately 2.93 times smaller compared to IM devices in the TM situation, while considering matching ION and VTH. The JL devices have an IOFF that is 12.9 times smaller and an IOFF that is 102 times smaller compared to the IM device for the QM situation. This is achieved by matching the ION and VTH values. It achieves a lesser drain-induced barrier lowering (DIBL) of approximately 28.10 mV/V, a virtually perfect subthreshold slope (SS) of roughly 60mV/dec, and a larger current ratio of ION/IOFF, which is approximately 1.42 × 107.
根据摩尔定律和国际器件与系统路线图 (IDRS),要将 MOSFET 尺寸缩小到 3 纳米技术节点,就必须引入并深入研究新的器件结构和先进材料。目前的研究重点是在无结 (JL) 和反转模式 (IM) 双围栅 (DSG) In0.53Ga0.47As 纳米管 (NT) MOSFET 上实施三重金属 (TM) 和四重金属 (QM) 栅工作函数工程技术。目的是使用 Silvaco ATLAS 3D TCAD 分析栅极长度为 3 nm 时的漏极电流 (ID) 特性。为了对 JL 和 IM In0.53Ga0.47As NT 进行公平比较,对 TM 和 QM JL In0.53Ga0.47As NT 的掺杂浓度进行了调整,以实现两个特定目标。首先,目标是产生与 IM In0.53Ga0.47As NT 相同的离子。其次,目标是实现与 IM In0.53Ga0.47As NT 相同的阈值电压 (VTH)。研究发现,在 TM 情况下,考虑到 ION 和 VTH 的匹配,JL 器件的 IOFF 比 IM 器件小约 2.93 倍。与 QM 情况下的 IM 器件相比,JL 器件的 IOFF 小 12.9 倍,IOFF 小 102 倍。这是通过匹配 ION 和 VTH 值实现的。它实现了约 28.10 mV/V 的较小漏极致势垒降低 (DIBL)、约 60mV/dec 的几乎完美的亚阈值斜率 (SS),以及约 1.42 × 107 的较大电流比 ION/IOFF。
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引用次数: 0
Three-leg bosonic triangular ladder in a staggered magnetic field 交错磁场中的三足玻色三角形梯子
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-31 DOI: 10.1016/j.physleta.2024.130022
Based on the dynamical Gutzwiller mean-field theory, we investigate the ground states of interacting bosons on a triangular ladder lattice, which is comprised of three legs, and in the presence of a staggered magnetic flux. As a consequence, the vortical lattice phase with triangular chiral vortical currents is discovered, which particularly features a biased ladder structure, characterized by larger populations on the inner leg than those of the two outer legs. This similar structure could be either figured out on the four-leg and five-leg flux ladders, interpreted by the Bose-Hubbard model. The variations of currents and populations induced by the growth of number of legs are discussed. We further identify a type of particle current going through a zigzag-shaped outline. It is also necessarily accompanied with the biased configuration on the distribution of population, and could be generalized to the four-leg or five-leg model.
基于动力学古茨维勒均场理论,我们研究了由三条腿组成的三角形梯形晶格上相互作用玻色子在交错磁通存在下的基态。结果,我们发现了具有三角形手性涡流的涡流晶格相,它尤其具有偏置梯形结构,其特点是内侧支脚上的种群数量大于外侧两支脚上的种群数量。这种类似的结构也可以通过玻色-哈伯德模型解释的四脚和五脚通量阶梯得出。我们还讨论了腿数增加引起的电流和种群变化。我们进一步确定了一种通过之字形轮廓的粒子流。它还必然伴随着种群分布上的偏置构型,并可推广到四脚或五脚模型。
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引用次数: 0
On dynamics of downward-propagating sprite streamers 关于向下传播的精灵流的动力学
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-30 DOI: 10.1016/j.physleta.2024.130020
An approximate approach to estimating characteristics of downward-propagating single positive sprite streamers is presented. Within the framework of this approach, the dependences of streamer radius and velocity on the altitude were obtained. The influence of changes in the altitude of streamer initiation and in the electric field at this altitude on the streamer parameters is considered. Estimates of the optical emission rate are obtained.
本文提出了一种近似方法,用于估算向下推进的单个正喷流体的特征。在这种方法的框架内,获得了流线半径和速度与高度的关系。研究还考虑了流线起始高度和该高度电场的变化对流线参数的影响。获得了光发射率的估计值。
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引用次数: 0
Cooperative behavior in multi-agent systems with intrinsic learners and extrinsic imitators 具有内在学习者和外在模仿者的多代理系统中的合作行为
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-30 DOI: 10.1016/j.physleta.2024.130015
Under the framework of evolutionary games, how to update strategies when individuals interact with multiple neighbors at the same time is a key problem to understand the evolution of cooperation. At present, a widely known method is imitation updating. However, it is undeniable that when resources or capabilities are limited, it is difficult for individuals to obtain more comprehensive information about their counterparts, resulting in imitation method no longer applicable. Reinforcement learning algorithms attract attention because players do not need to know information such as the opponent's payoff, and only adjust strategies based on their own experience and expectations. In view of this, we consider both imitation and reinforcement learning as two behavioral adjustment models, and explore the evolution of cooperative behavior in mixed populations of extrinsic imitators and intrinsic learners. Numerous simulations have shown that when the value of temptation to defect is small, there exists an optimal proportion of intrinsic learners bring group cooperation to its peak. However, in interactive environments with larger social dilemmas, intrinsic learners are effective in resisting betrayal and maintaining group behavior compared to traditional extrinsic imitators. The proposed model reflects the characteristics of seeking advantages, avoiding disadvantages, and imitation in biological groups, and provides new ideas for the design of new game models.
在进化博弈的框架下,当个体同时与多个邻居互动时如何更新策略是理解合作进化的一个关键问题。目前,广为人知的方法是模仿更新。但不可否认的是,当资源或能力有限时,个体很难获得更全面的同伴信息,导致模仿方法不再适用。强化学习算法之所以备受关注,是因为博弈者无需了解对手的回报等信息,只需根据自己的经验和预期调整策略。有鉴于此,我们将模仿和强化学习视为两种行为调整模型,并探讨了外在模仿者和内在学习者混合群体中合作行为的演化。大量模拟结果表明,当叛逃的诱惑值较小时,存在一个最佳的内在学习者比例,使群体合作达到顶峰。然而,在社会困境较大的互动环境中,与传统的外在模仿者相比,内在学习者能有效抵制背叛,维持群体行为。所提出的模型反映了生物群体中寻求优势、避免劣势和模仿的特点,为设计新的游戏模型提供了新思路。
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引用次数: 0
Ordinal language of antipersistent binary walks 反二进制行走的序数语言
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-30 DOI: 10.1016/j.physleta.2024.130017
This paper explores the effectiveness of using ordinal pattern probabilities to evaluate antipersistency in the sign decomposition of long-range anti-correlated Gaussian fluctuations. It is numerically shown that ordinal patterns are able to effectively measure both persistent and antipersistent dynamics by analyzing the sign decomposition derived from fractional Gaussian noise. These findings are crucial given that traditional methods such as Detrended Fluctuation Analysis are unsuccessful in detecting anti-correlations in such sequences. The numerical results are supported by physiological and environmental data, illustrating its applicability in real-world situations.
本文探讨了在长程反相关高斯波动的符号分解中使用序数模式概率评估反持续性的有效性。数值表明,通过分析分数高斯噪声得出的符号分解,序数模式能够有效地测量持续和反持续动态。鉴于传统方法(如去趋势波动分析法)无法成功检测此类序列中的反相关性,这些发现至关重要。数值结果得到了生理和环境数据的支持,说明了它在现实世界中的适用性。
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引用次数: 0
Multi-hump solitons under fractional diffraction and inhomogeneous cubic nonlinearity in a quadratic potential 二次势中分数衍射和非均质立方非线性条件下的多驼峰孤子
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-30 DOI: 10.1016/j.physleta.2024.130018
We demonstrate the existence and stability of various multi-hump soliton families within the nonlinear Schrödinger equation with inhomogeneous cubic nonlinearity and fractional diffraction, in the presence of a linear quadratic potential. The profiles, amplitudes, and powers of the three soliton families (the two-, three- and four-hump solitons) are investigated under different parameters, including the Lévy index, propagation constant, and the parameters of the nonuniform cubic nonlinearity. The amplitudes of the two- and three-hump solitons are little sensitive to the variations in the Lévy index, but are highly sensitive to the changes in the propagation constant. Furthermore, we report on two distinct types of four-hump solitons and their propagation under longitudinally modulated nonlinearity. Interestingly, a gradual increase or decrease in the parameter results in the stable regular propagation, while a sudden increase or decrease causes severe distortions and leads to unstable behavior of solitons.
我们证明了在非均质三次非线性和分数衍射的非线性薛定谔方程中,在存在线性二次势的情况下,各种多驼峰孤子族的存在和稳定性。研究了三个孤子族(二驼峰、三驼峰和四驼峰孤子)在不同参数(包括莱维指数、传播常数和非均匀立方非线性参数)下的轮廓、振幅和功率。双驼峰和三驼峰孤子的振幅对列维指数的变化不太敏感,但对传播常量的变化高度敏感。此外,我们还报告了两种不同类型的四驼峰孤子及其在纵向调制非线性条件下的传播情况。有趣的是,参数的逐渐增大或减小会导致稳定的规则传播,而突然增大或减小则会造成严重扭曲,导致孤子行为不稳定。
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引用次数: 0
The stable conversion for atom-homonuclear-trimer via the resonance-locked inverse engineering 通过共振锁定逆工程实现原子-单核-三聚体的稳定转换
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-30 DOI: 10.1016/j.physleta.2024.130019
We derive an exact passage for atom-trimer conversion via the resonance-locked inverse engineering. In particular, the temporal shapes of the fields and the detunings correspond to the exact solution of the system. As a result, the atoms can be perfectly converted into trimers when we choose the suitable parametrization, in which the conversion rate is close to 100%. Compared to the nonlinear stimulated Raman adiabatic passage, the conversion process for exact passage is more robust and faster, which does not be affected by three-body interactions.
我们通过共振锁定逆工程推导出原子-三聚体转换的精确通道。特别是,场的时间形状和失谐与系统的精确解相对应。因此,当我们选择合适的参数时,原子可以完美地转换成三聚体,转换率接近 100%。与非线性受激拉曼绝热通过相比,精确通过的转换过程更稳健、更快速,不受三体相互作用的影响。
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引用次数: 0
Tunable two-photon THz emissions through pair annihilation in graphene with a double gate structure 通过双栅结构石墨烯中的对湮灭实现可调谐双光子太赫兹发射
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-30 DOI: 10.1016/j.physleta.2024.130021
How far the analogy between massless Dirac fermions in a truly relativistic (1+2)-D spacetime and electrons near the Fermi level in graphene can be seriously taken? A hallmark of relativistic QFT is the multi-photon emission through pair annihilation. In this paper, to address this question we formulate the theoretical basis for a double gate graphene device. In an infinite sheet of pristine graphene the Fermi level is located at the Dirac points, but it can be tunned through gate potentials. This way, electron and hole pockets are induced, forming N and P regions in a large monolayer graphene sheet. The quasi-particles can be accelerated through the source-drain potential to scatter at an intrinsic region, leading to electron-hole annihilation. Feynman amplitudes and emission rates for two-photon emissions arising from electron-hole annihilation in graphene are presented at lowest order, leading to analytical formulae for two photon production, which could experimentally be tested.
真正相对论 (1+2)-D 时空中的无质量狄拉克费米子与石墨烯中费米级附近的电子之间的类比在多大程度上可以被认真对待?相对论 QFT 的一个标志是通过成对湮灭实现多光子发射。在本文中,为了解决这个问题,我们提出了双栅石墨烯器件的理论基础。在原始石墨烯的无限薄片中,费米级位于狄拉克点,但可以通过栅极电位进行调整。这样,电子和空穴就会被诱导出来,在大型单层石墨烯片中形成 N 区和 P 区。准粒子可以通过源-漏电势加速,在本征区域散射,导致电子-空穴湮灭。研究提出了石墨烯中电子-空穴湮灭产生的双光子发射的最低阶费曼振幅和发射率,从而得出了双光子产生的分析公式,并可对其进行实验测试。
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引用次数: 0
Plasma-metal junction: A junction with negative turn-on voltage 等离子体-金属结:具有负开启电压的结
IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-30 DOI: 10.1016/j.physleta.2024.129994
Unlike junctions in solid-state devices, a plasma-metal junction (pm-junction) is a junction of classical and quantum electrons. The plasma electrons are Maxwellian in nature, while metal electrons obey the Fermi-Dirac distribution. In this experiment, the current-voltage characteristics of solid-state devices that form homo or hetero-junction are compared to the pm-junction. Observation shows that the turn-on voltage for pn-junction is 0.5V and decreases to 0.24V for metal-semiconductor junction. However, the pm-junction's turn-on voltage was lowered to a negative value of 7.0V. The devices with negative turn-on voltage are suitable for high-frequency operations. Further, observations show that the current-voltage characteristics of the pm-junction depend on the metal's work function, and the turn-on voltage remains unchanged. This result validates the applicability of the energy-band model for the pm-junction. We present a perspective metal-oxide-plasma (MOP), a gaseous electronic device, as an alternative to metal-oxide-semiconductor (MOS), based on the new basic understanding developed.
与固态设备中的结不同,等离子体-金属结(pm-结)是经典电子和量子电子的结。等离子体电子的性质是麦克斯韦电子,而金属电子则服从费米-狄拉克分布。在本实验中,形成同结或异结的固态器件的电流-电压特性与 pm 结进行了比较。观察结果表明,pn 结的开启电压为 0.5V,而金属半导体结的开启电压则降至 0.24V。然而,pm 结的开启电压却降低到了负值 -7.0V。具有负开启电压的器件适用于高频操作。此外,观察结果表明,pm 结的电流-电压特性取决于金属的功函数,而开启电压保持不变。这一结果验证了能带模型对 pm 结的适用性。基于新的基本认识,我们提出了金属-氧化物-等离子体(MOP)这一气态电子器件,作为金属-氧化物-半导体(MOS)的替代品。
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引用次数: 0
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Physics Letters A
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