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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

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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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Quantifying Heat02:46

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Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher temperature. When the...
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Specific Heat01:16

Specific Heat

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The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
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Heat Flow and Specific Heat01:12

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Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
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Heating and Cooling Curves02:44

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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
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Production and Targeting of Monovalent Quantum Dots
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Dynamically induced heat rectification in quantum systems.

Andreu Riera-Campeny1, Mohammad Mehboudi2, Marisa Pons3

  • 1Física Teòrica: Informació i Fenòmens Quàntics. Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.

Physical Review. E
|April 20, 2019
PubMed
Summary
This summary is machine-generated.

Dynamically driven linear quantum systems can achieve heat rectification, a phenomenon where heat flows asymmetrically. This study shows how driving frequency controls this effect, enabling applications like thermal transistors.

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Area of Science:

  • Quantum thermodynamics
  • Condensed matter physics

Background:

  • Heat rectifiers enable asymmetric heat conduction, crucial for thermal management.
  • Linear quantum systems typically exhibit symmetric heat transport.

Purpose of the Study:

  • To analytically investigate heat rectification in linear quantum systems.
  • To identify conditions for inducing asymmetric heat currents in linear systems.

Main Methods:

  • Analytical study of heat transport in driven linear quantum networks.
  • Analysis of the role of driving frequency in heat exchange processes.

Main Results:

  • Asymmetric heat currents in linear systems require dynamic driving.
  • Driving frequency can be tuned to favor non-symmetric heat exchange.
  • Demonstrated feasibility of driven harmonic networks as thermal transistors.

Conclusions:

  • Dynamic driving is essential for achieving heat rectification in linear quantum systems.
  • Tuning driving frequency offers control over thermal transport asymmetry.
  • Driven harmonic networks show promise as efficient thermal transistors.