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Kinetic energy driven pairing in cuprate superconductors
Th A Maier1, M Jarrell, A Macridin
1Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA.
Physical Review Letters
|February 3, 2004
Summary
In underdoped cuprates, superconductivity is driven by kinetic energy reduction, unlike conventional superconductors. This study reveals a transition from a spin-charge separated state to a superconducting state with quasiparticle excitations.
Area of Science:
- Condensed matter physics
- Quantum mechanics
Background:
- Conventional superconductors exhibit pairing driven by potential energy reduction and kinetic energy increase.
- Underdoped cuprates show optical evidence suggesting pairing is driven by kinetic energy reduction.
Purpose of the Study:
- Investigate the mechanism of superconductivity in the two-dimensional Hubbard model, particularly in underdoped cuprates.
- Determine whether pairing is driven by kinetic energy reduction in this system.
Main Methods:
- Utilized the dynamical cluster approximation (DCA) to study the two-dimensional Hubbard model.
- Analyzed the evolution of the electronic state and superconducting properties.
Main Results:
- Confirmed that pairing in the studied system is driven by kinetic energy reduction.
- Observed a transition from an unconventional state with partial spin-charge separation to a superconducting state.
- Identified the emergence of quasiparticle excitations in the superconducting state.
Conclusions:
- The findings support the hypothesis that kinetic energy reduction drives pairing in underdoped cuprates.
- The study elucidates the unconventional nature of superconductivity in this model system.
- Highlights the importance of the dynamical cluster approximation in understanding complex quantum phenomena.