搜索结果: 31-45 共查到“知识库 量子力学”相关记录1423条 . 查询时间(1.824 秒)
据物理学家组织网近日报道，一个由瑞士、西班牙和美国科学家组成的研究小组开发出一种以量子阱为基础的热电能量收集器，可以从环境中收集热量转化为电能，在为小型电子设备供电方面有很大潜力。相关论文发表在最近的《新物理学杂志》上。目前，开发热电能量收集器的最大挑战是怎样造出既高能又高效的系统。科学家在不断实验和改进制造热电能量收集器的材料，其中之一是量子点，一种具有半导体性质的纳米晶体。量子点有着清晰的能级...
摆脱了数学证明，以原始命题和已知的实验结果为论据进行演绎推理，来解决关于物质或物理学的一系列基本问题，并由于在研究方法上的惊人突破，硕果累累：①已知和未知的物质单元及光子和引力子是具有确定质量的物质粒子.②能量及热量、电磁场能量、引力场能量、电磁波、引力波、物质波、射线、暗物质、暗能量是具有确定质量的物质粒子.③微观粒子及光子具有波动性是由于它们发射出来具有相同确定质量的物质粒子所造成.④物质粒子...
应变量子阱能带结构的数值分析
应变量子阱 6×6 Luttinger-Kohn哈密顿量 Matlab
2014/3/20
以InGaAs/GaAs应变量子阱材料为例,讨论了量子阱结构中的应变效应,用k·p微扰理论给出包括重空穴带、轻空穴带和自旋-轨道分裂带相互作用和考虑应变作用的6×6 Luttinger-Kohn哈密顿量,利用Matlab精确求解,并进行数值模拟得到了布里渊区中心的导带结构、价带结构和包络函数。结果表明,应变的引入使晶体产生畸变,改变了晶体结构的对称性,进而改变了材料的能带结构,提供了一种有效的能带...
The Existence of Quantum Entanglement Catalysts.
Entanglement catalysts entanglement states entanglement
2012/11/29
Without additional resources, it is often impossible to transform one entangled quantum state into another with local quantum operations and classical communication. Jonathan and Plenio (Phys. Rev. Le...
超静定结构温度应力问题探讨
温度应力 超静定 装配应力
2013/10/10
把温度应力问题分为两个过程求解. 先解除多余约束,将超静定问题转化为静定问题,使杆件自由伸长或缩短.再按照原来的方式将所有杆件安装好,由于温度升高后,杆件的长度可能不再匹配,所以会产生装配应力,这时便转化为一般的装配应力问题. 这样便把耦合在一起的温度应力和拉压应力分解成两个过程,令学生感到非常容易接受.
Bypassing the bandwidth theorem with PT symmetry
Bypassing the bandwidth theorem PT symmetry Classical Physics
2012/5/29
The beat time {\tau}_{fpt} associated with the energy transfer between two coupled oscillators is dictated by the bandwidth theorem which sets a lower bound {\tau}_{fpt}\sim 1/{\delta}{\omega}. We sho...
Complex-Dynamical Solution to Many-Body Interaction Problem and Its Applications in Fundamental Physics
Complex-Dynamical Solution Many-Body Interaction Problem Fundamental Physics quantum mechanics
2012/4/27
We review the recently proposed unreduced, complex-dynamical solution to many-body problem with arbitrary interaction and its application to unified solution of fundamental problems, including foundat...
The criticism by W. E. Lamb, W. Schleich, M. Scully, C. Townes of a simplified quantum electrodynamics which represents the photon as a true particle is illustrated. Collisions being absent in low-pre...
Contradiction of the DENSITY MATRIX notion in quantum mechanics
Contradiction of the DENSITY MATRIX notion quantum mechanics General Physics
2012/4/19
It is shown that description of a nonpolarized neutron beam by density matrix is contradictory. Density matrix is invariant with respect to choice of quantization axis, while experimental devices can ...
Dynamics of hydrogen-like atom bounded by maximal acceleration
Maximal acceleration Extended Relativistic Dynamics Hydrogen-like atom probabilistic description center of mass
2012/4/20
The existence of a maximal acceleration for massive objects was conjectured by Caianiello 30 years ago based on the Heisenberg uncertainty relations. Many consequences of this hypothesis have been stu...
Octonion Quantum Chromodynamics
Octonion Quantum Chromodynamics Octonions Quantum Chromodynamics (QCD) SU(3) symmetry matrices
2012/4/19
Starting with the usual definitions of octonions, an attempt has been made to establish the relations between octonion basis elements and Gell-Mann \lambda matrices of SU(3)symmetry on comparing the m...
Quantum Ground States as Equilibrium Particle-Vacuum Interaction States
Quantum ground states Vacuum fluctuations Particle‐vacuum interaction states Zero‐point fluctuations Harmonic oscillator quantum ground state
2012/4/20
A remarkable feature of atomic ground states is that they are observed to be radiationless in nature, despite (from a classical viewpoint) typically involving charged particles in accelerated motions....
Magnetic phases in the one-dimensional Kondo chain on a metallic surface
Magnetic phases the one-dimensional Kondo chain metallic surface
2012/2/27
We study the low-temperature properties of a one-dimensional spin-1/2 chain of magnetic impurities coupled to a (normal) metal environment by means of anisotropic Kondo exchange. In the case of easy-p...
Nb2N3的力学和电子性质的第一性原理
氮化铌 硬质材料 高压物理
2012/11/12
采用基于密度泛函理论的第一性原理方法研究Nb2N3的晶体结构、 力学、 晶格动力学和电子性质. 结果表明: Nb2N3常压下具有正交η-Ta2N3结构, 其弹性常数满足波恩-黄昆判据, 且晶格动力学稳定; Nb2N3具有较大的体弹性模量（304 GPa）和硬度（19.3 GPa）, 由于Nb 4d-轨道与N 2p-轨道杂化形成三维Nb\|N共价键, 因此Nb2N3为离子性较强的半导体材料。
Phonon-assisted transport through suspended carbon nanotube quantum dots
Phonon-assisted transport through suspended carbon nanotube quantum dots
2014/5/28
Motivated by several recent experiments, we investigate phonon-assisted electronic transport through suspended carbon nanotube quantum dots including electron-electron, electron-phonon, and spin-orbit...