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相关概念视频

First Law: Particles in One-dimensional Equilibrium01:10

First Law: Particles in One-dimensional Equilibrium

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Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
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Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

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Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
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Equilibrium Conditions for a Particle01:23

Equilibrium Conditions for a Particle

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When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Oscillations about an Equilibrium Position01:04

Oscillations about an Equilibrium Position

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Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
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Updated: Jun 24, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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在周期驱动的固体系统中,非adiabatic混合量子-经典动态的浮盘.

Jingqi Chen1,2,3, Yu Wang2,3, Wenjie Dou2,3,4

  • 1Fudan University, 220 Handan Road, Shanghai 200433, China.

The Journal of chemical physics
|June 3, 2024
PubMed
概括
此摘要是机器生成的。

我们开发了新的方法,Floquet平均场动力学和Floquet表面跳跃,以研究驱动固体中的电子-声子相互作用. 浮板表面跳跃提供了更准确的载体群体动态,特别是在相互空间.

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Last Updated: Jun 24, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 量子动力学就是量子动力学.
  • 材料科学是一种材料科学.

背景情况:

  • 研究周期性驱动的固体中的非动动力学对于理解光物相互作用等现象至关重要.
  • 现有的方法在模拟复杂的载体 - 声波相互作用方面面临挑战,特别是在相互空间.

研究的目的:

  • 介绍和验证Floquet平均场动力学和Floquet表面跳跃对于非adiabatic动力学.
  • 研究通过光物质相互作用对电子群体和移动性的调制.
  • 比较Floquet表面跳跃的准确性和载体 - 声波相互作用的平均场动态.

主要方法:

  • 在真实空间和反向空间中制定Floquet平均场动态和Floquet表面跳跃.
  • 使用Holstein和Peierls模型在周期性驾驶下模拟电子载体 - 声波交互.
  • 使用截断的互换空间基础来建模低动量载体相互作用.

主要成果:

  • 通过强烈的光物质相互作用,证明了电子群体和移动性的有效调制.
  • 展示了使用截断互换空间来建模载体 - 声波相互作用的可行性,在现实空间中是不切实际的.
  • 揭示了Floquet表面跳跃提供比平均场动态更准确的载体种群,即使有显著的截断.

结论:

  • 提出的Floquet方法对于研究驱动固体系统中的非adiabatic动力学是有效的.
  • 与平均场方法相比,浮板表面跳跃为载体群体动态提供了更高的准确性.
  • 这些方法有助于我们更好地理解周期性驱动材料中的载体 - 声子相互作用.