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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
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Disorder-Driven Multifractality Transition in Weyl Nodal Loops
Miguel Gonçalves1, Pedro Ribeiro1,2, Eduardo V Castro2,3
1CeFEMA, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
Physical Review Letters
|April 18, 2020
Summary
Short-range disorder in nodal line semimetals reveals a novel multifractal phase. This phase transitions to a compressible metal and eventually an Anderson insulator at higher disorder strengths.
Area of Science:
- Condensed matter physics
- Topological materials
Background:
- Nodal line semimetals exhibit unique electronic properties dictated by band crossings along nodal lines.
- Disorder effects are crucial for understanding the stability and transport properties of topological materials.
Purpose of the Study:
- Investigate the impact of short-range disorder on nodal line semimetals.
- Characterize the novel electronic phases and transitions induced by disorder.
Main Methods:
- Numerically exact simulations were employed to study the system.
- Analysis focused on the ground-state wave function's momentum-space amplitude and multifractal properties.
Main Results:
- A novel multifractal semimetallic phase emerges at small disorder strengths, with wave function amplitude localized around the nodal line.
- A critical disorder strength drives a transition to a compressible metal, accompanied by a change in fractality.
- At higher disorder, an Anderson metal-insulator transition is observed.
Conclusions:
- Disorder fundamentally alters the nature of nodal line semimetals, creating phases distinct from the clean limit.
- The observed transitions are characterized by critical exponents and changes in multifractality.
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