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Bond order in two-dimensional metals with antiferromagnetic exchange interactions
Subir Sachdev1, Rolando La Placa
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Physical Review Letters
|July 30, 2013
Summary
We found that charge ordering in 2D metals with antiferromagnetic interactions exhibits dominant d-wave symmetry. This suggests charge ordering occurs on copper bonds in cuprates, particularly in underdoped materials.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Solid State Physics
Background:
- Charge ordering instabilities are crucial in understanding the complex electronic properties of two-dimensional (2D) metals.
- Antiferromagnetic exchange interactions play a significant role in mediating these instabilities.
- Understanding these phenomena is key to developing novel electronic devices and materials.
Purpose of the Study:
- To investigate charge-ordering instabilities in 2D metals with antiferromagnetic interactions.
- To explore arbitrary ordering wave vectors and internal wave functions of the particle-hole pair condensate.
- To determine the symmetry and nature of charge ordering in materials like cuprates.
Main Methods:
- Unrestricted Hartree-Fock (HF) computation.
- Analysis of charge-ordering instabilities.
- Theoretical modeling of particle-hole pair condensates.
Main Results:
- The charge ordering exhibits a dominant d-wave symmetry for various ordering wave vectors.
- This d-wave symmetry was observed for wave vectors consistent with experimental findings in YBa2Cu3O(y) at low temperatures.
- The study proposes incommensurate bond order parameters for underdoped cuprates, indicating ordering on the copper (Cu) lattice bonds.
Conclusions:
- The findings reveal a prevalent d-wave symmetry in charge ordering of 2D metals with antiferromagnetic interactions.
- The results provide a theoretical framework for understanding charge ordering in cuprates, particularly the underdoped regime.
- The study highlights the relevance of emergent pseudospin symmetry even for short-ranged, incommensurate spin correlations.
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