Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.027002
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Funding
- DST [NSF-DMR 0706203]
- DOE [DE-FG02-07ER46423]
- U.S. Department of Energy (DOE) [DE-FG02-07ER46423] Funding Source: U.S. Department of Energy (DOE)
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We investigate the asymmetry between electron and hole doping in a 2D Mott insulator and the resulting competition between antiferromagnetism (AFM) and d-wave superconductivity (SC), using variational Monte Carlo calculations for projected wave functions. We find that key features of the T=0 phase diagram, such as critical doping for SC-AFM coexistence and the maximum value of the SC order parameter, are determined by a single parameter eta which characterizes the topology of the Fermi surface at half filling defined by the bare tight-binding parameters. Our results give insight into why AFM wins for electron doping, while SC is dominant on the hole-doped side. We also suggest using band structure engineering to control the eta parameter for enhancing SC.
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