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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Phonon engineering in proximity enhanced superconductor heterostructures.

Yong-Chao Tang1,2, Sangil Kwon3,4, Hamid R Mohebbi3

  • 1Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada. yongchao.tang@uwaterloo.ca.

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Summary

Researchers engineered the phonon density of states in thin superconducting films to reduce losses. This optimization enhances the performance of quantum devices by controlling quasiparticle interactions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Engineering

Background:

  • Superconducting devices are crucial for quantum technologies.
  • Quasiparticle losses in superconducting films limit device performance.
  • Phonon interactions play a significant role in these losses.

Purpose of the Study:

  • To tailor the phonon density of states (DOS) in thin superconducting films.
  • To suppress quasiparticle losses and enhance resonator quality factors.
  • To investigate the impact of quantized phonon spectra in heterostructures.

Main Methods:

  • Examined a proximity-enhanced three-layered Al/Nb/Al heterostructure.
  • Analyzed the local quantized phonon spectrum of ultrathin Al cladding layers.
  • Measured superconducting resonator quality factors at varying temperatures.

Main Results:

  • Observed a non-monotonic temperature dependence of quality factors in Al/Nb/Al microstrip resonators.
  • Identified a maximum quality factor at 1.2 K due to a quantized phonon ladder.
  • Demonstrated the pronounced effect of local phonon DOS on resonator performance.

Conclusions:

  • The phonon DOS can be engineered to improve superconducting device performance.
  • Quantized phonon spectra in heterostructures offer a pathway to suppress quasiparticle losses.
  • This research provides a method to enhance the quality factors of superconducting quantum devices.