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Related Concept Videos

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Published on: August 2, 2019

Order parameter fluctuations at a buried quantum critical point.

Yejun Feng1, Jiyang Wang, R Jaramillo

  • 1The Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 25, 2012
PubMed
Summary
This summary is machine-generated.

Researchers directly observed quantum critical fluctuations in 2H-NbSe(2) using X-ray diffraction. This study reveals enhanced quantum fluctuations near a quantum critical point within a superconducting phase.

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Area of Science:

  • Condensed matter physics
  • Quantum criticality
  • Materials science

Background:

  • Quantum criticality describes systems near absolute zero, exhibiting exotic phenomena.
  • Directly observing quantum critical fluctuations is challenging, limiting theoretical understanding.
  • Charge density waves (CDW) in materials like 2H-NbSe(2) are potential platforms for studying quantum criticality.

Purpose of the Study:

  • To directly observe and characterize quantum critical fluctuations.
  • To investigate the behavior of charge density waves under high pressure and low temperature.
  • To explore the interplay between superconductivity, charge density waves, and quantum criticality.

Main Methods:

  • High-pressure X-ray diffraction on 2H-NbSe(2) at low temperatures.
  • Tracking charge density wave (CDW) order parameter fluctuations.
  • Concurrent measurements of crystal lattice dynamics.

Main Results:

  • Observation of a broad regime of order parameter fluctuations near a quantum critical point.
  • X-ray diffraction successfully probed CDW fluctuations within a superconducting phase.
  • Evidence for a continuous phase transition indicated by lattice measurements.

Conclusions:

  • Direct measurement of quantum critical fluctuations in 2H-NbSe(2) is achieved.
  • Results confirm enhanced quantum fluctuations in low-dimensional systems.
  • Findings provide constraints for theories of the quantum critical Fermi surface.