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Disorder- and Interaction-Driven Quantum Criticality in WSe2.

Nasir Ali1, Fida Ali2, Hyungyu Choi1,3

  • 1SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea.

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|March 20, 2025
PubMed
Summary
This summary is machine-generated.

Strong disorder and Coulomb interactions drive quantum phase transitions in 2D materials. Thickness-dependent WSe2 reveals anomalous metallic transport and distinct quantum criticalities, offering insights into metal-insulator transitions.

Keywords:
Coulomb interactionsWSe2bad-metal behaviordisordermetallic glass phasequantum criticalityquantum fluctuations

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • 2D Materials Physics

Background:

  • Quantum phase transitions (QPTs) in 2D materials are driven by strong Coulomb interactions or disorder.
  • Understanding these disorder- and interaction-driven QPTs is challenging due to the simultaneous presence of strong disorder and Coulomb interactions.
  • Metal-insulator transitions (MITs) are key phenomena in exploring these QPTs.

Purpose of the Study:

  • To investigate the interplay between strong disorder and strong Coulomb interactions in WSe2.
  • To elucidate the mechanisms behind disorder- and interaction-driven metal-insulator QPTs by controlling WSe2 thickness.
  • To understand anomalous metallic transport and quantum criticality in 2D materials.

Main Methods:

  • Systematic control of WSe2 thickness to tune disorder and Coulomb interaction strengths.
  • Measurement of conductivity and resistivity as a function of temperature and thickness.
  • Analysis of conductivity scaling collapse to identify quantum criticality regimes.

Main Results:

  • Observed MITs in thin WSe2 consistent with the Mott-Ioffe-Regel limit, and in thick WSe2 exhibiting bad-metal behavior.
  • Identified distinct temperature dependences of resistivity, revealing anomalous metallic transport.
  • Observed the emergence of a metallic glass phase (MGP) in thin WSe2, indicating significant disorder and interaction roles, absent in thick WSe2 where Coulomb interactions dominate.

Conclusions:

  • Thickness-dependent WSe2 serves as a crucial testbed for studying metal-insulator QPTs and anomalous transport in 2D materials.
  • Disorder dominates quantum criticality in thin WSe2, while Coulomb interactions drive Mott quantum criticality in thick WSe2.
  • The study provides compelling evidence for the distinct roles of disorder and interactions in driving QPTs and emergent phases like MGP.