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The impact of Rashba spin-orbit coupling in charge-ordered systems
Rodrigo A Fontenele1, Sebastião Dos Anjos Sousa Júnior1, Tarik P Cysne2
1Instituto de Física, Universidade Federal do Rio de Janeiro Cx.P. 68.528, 21941-972 Rio de Janeiro, RJ, Brazil.
The Rashba spin-orbit coupling (RSOC) destabilizes charge-density waves (CDW) in materials with strong electron-phonon coupling (EPC). Quantum correlations reveal RSOC further suppresses CDW, expanding the metallic phase.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Charge-density waves (CDW) are crucial electronic phases in solids.
- Electron-phonon coupling (EPC) plays a key role in CDW formation.
- Rashba spin-orbit coupling (RSOC) can significantly alter electronic properties.
Purpose of the Study:
- Investigate the impact of RSOC on CDW stability.
- Determine the influence of strong EPC within the Holstein model.
- Map the phase diagram of the Rashba-Holstein model.
Main Methods:
- Hartree-Fock mean-field theory for initial phase diagram analysis.
- Cluster perturbation theory (CPT) to incorporate quantum correlations.
- Analysis of pairing correlations to identify critical points.
Main Results:
- RSOC disfavors the CDW phase, promoting a correlated Rashba metal.
- CPT reveals RSOC is more detrimental to CDW than mean-field theory suggests.
- The Rashba metal phase is expanded when considering quantum correlations.
Conclusions:
- RSOC significantly impacts CDW stability in systems with large EPC.
- Quantum correlations are essential for accurately describing the interplay between RSOC, EPC, and CDW.
- The study identifies critical points and phase boundaries for the Rashba-Holstein model.
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