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The Pauli Exclusion Principle03:06

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Quantum phase transition from triangular to stripe charge order in NbSe2.

Anjan Soumyanarayanan1, Michael M Yee, Yang He

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA. anjan@physics.harvard.edu

Proceedings of the National Academy of Sciences of the United States of America
|January 16, 2013
PubMed
Summary

Researchers discovered a new interface between two types of charge-density waves (CDWs) in NbSe2, driven by local strain. This finding helps explain superconductivity in correlated materials and resolves debates on CDW properties.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Strongly correlated systems exhibit complex phenomena due to competing electronic phases.
  • Density waves, periodic charge or spin modulations, are linked to exotic superconductivity but are challenging to study with disorder.
  • The relationship between competing density wave orders and high-temperature superconductivity remains unclear.

Purpose of the Study:

  • To investigate the interplay between different density wave orders in the stoichiometric superconductor NbSe2.
  • To understand the role of local strain in tuning quantum phase transitions in correlated materials.
  • To resolve longstanding questions regarding the spectroscopic gap and Fermi surface nesting in charge-density wave phases.

Main Methods:

  • Utilized scanning tunneling microscopy (STM) to image the surface of NbSe2.
  • Performed low-temperature measurements to analyze the observed phenomena.
  • Investigated the influence of local strain as a tuning parameter for quantum phase transitions.

Main Results:

  • Discovered a novel interface between a unidirectional (stripe) charge-density wave and a tridirectional (triangular) charge-density wave on NbSe2.
  • Ruled out thermal fluctuations and identified local strain as the key factor driving the observed quantum phase transition.
  • Resolved debates concerning the anomalous spectroscopic gap and the role of Fermi surface nesting within the charge-density wave phase.

Conclusions:

  • Local strain is a critical factor in controlling phase transitions and competing phenomena in strongly correlated materials.
  • The identified quantum interface provides a unique platform for studying density wave physics.
  • These findings offer insights applicable to understanding superconductivity in cuprates and other complex materials.