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Related Concept Videos

Sound Waves: Resonance01:14

Sound Waves: Resonance

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Concept of Resonance and its Characteristics01:19

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If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
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Resonance in an AC Circuit01:26

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The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
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When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
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Series Resonance01:17

Series Resonance

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The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Current-induced forces in single-resonance systems.

Sebastián E Deghi1, Lucas J Fernández-Alcázar2, Horacio M Pastawski1

  • 1Instituto de Física Enrique Gaviola and Facultad de Matemática, Astronomía, Física y Computación, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, 5000, Argentina.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 2, 2021
PubMed
Summary
This summary is machine-generated.

Researchers studied current-induced forces and electronic friction in nanoscale systems. Understanding these forces is key to optimizing quantum machines and understanding conductor deformation.

Keywords:
current-induced forcesnanoelectromechanical devicesnonequilibrium Green's functionsone-dimensional conductorsquantum transportsingle-resonance system

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Area of Science:

  • Nanoscience and Quantum Mechanics
  • Condensed Matter Physics

Background:

  • Growing interest in nanoelectromechanical devices and quantum machines.
  • Importance of understanding mechanical effects of electric currents on nanoscale conductors.

Purpose of the Study:

  • Thoroughly study current-induced forces and electronic friction.
  • Analyze systems modeled by a single energy level coupled to two reservoirs.
  • Provide insights for optimizing quantum dot devices and understanding conductor deformation.

Main Methods:

  • Theoretical analysis of a quantum system with a single energy level coupled to two reservoirs.
  • Investigation of current-induced forces and electronic friction within this model.

Main Results:

  • Characterization of current-induced forces in the archetypal model.
  • Quantification of electronic friction effects.
  • Identification of conditions influencing system performance.

Conclusions:

  • Results enhance understanding of quantum dot device performance.
  • Findings aid in rationalizing the role of current-induced forces in mechanical deformation of conductors.
  • Provides a foundational model for nanoscale electromechanical systems.