7,954 research outputs found
Microscopic Inhomogeneity and Superconducting Properties of a Two-dimensional Hubbard Model for High- Cuprate
Recent scanning tunneling microscopy measurements on cuprate superconductors
have revealed remarkable spatial inhomogeneities in the single-particle energy
gap. Using cellular dynamical mean-field theory, we study the zero temperature
superconducting properties of a single-band Hubbard model with a spatial
modulation of the electron density. We find that the inhomogeneity in the
electronic structure results in a substantial spatial variation in the
superconducting order parameter and single-particle energy gap, reminiscent of
the experimental results. In particular, we find that the order parameter and
gap amplitudes in the hole-rich regions are significantly enhanced over the
corresponding quantities in a uniform system, if the hole-rich regions are
embedded in regions with smaller hole density.Comment: 6 pages, 4 figures, and 2 table
Enhanced Superconductivity in Superlattices of High- Cuprates
The electronic properties of multilayers of strongly correlated models for
cuprate superconductors are investigated using cluster dynamical mean-field
techniques. We focus on combinations of underdoped and overdoped layers and
find that the superconducting order parameter in the overdoped layers is
enhanced by the proximity effect of the strong pairing scale originating from
the underdoped layers. The enhanced order parameter can even exceed the maximum
value in uniform systems. This behavior is well reproduced in slave-boson
mean-field calculations which also find higher transition temperatures than in
the uniform system.Comment: 4 pages, 4 figure
Coexistence of strong nematic and superconducting correlations in a two-dimensional Hubbard model
Using a dynamic cluster quantum Monte Carlo approximation, we study a
two-dimensional Hubbard model with a small orthorhombic distortion in the
nearest neighbor hopping integrals. We find a large nematic response in the
low-frequency single-particle scattering rate which develops with decreasing
temperature and doping as the pseudogap region is entered. At the same time,
the d-wave superconducting gap function develops an s-wave component and its
amplitude becomes anisotropic. The strength of the pairing correlations,
however, is found to be unaffected by the strong anisotropy, indicating that
d-wave superconductivity can coexist with strong nematicity in the system.Comment: 4 pages, 4 figures, published as PRB 84, 220506(R) (2011
Recommended from our members
THE EMERGENCE OF TRANSFORMATIONAL LEADERS AMONG ASIAN WOMEN IN HOSPITALITY
As women increasingly occupy key leadership roles in government, industry and society, their styles and approaches towards leading others continues to attract attention in the literature. The focus of this attention is best served in celebrating the transformational nature of women in leadership by illuminating their approach to leadership in a transformational manner. Of particular importance in this regard is the rapid growth and expansion of the Asian hospitality and tourism industry. Increasingly, women will be holding leadership positions of influence, bringing with them a range of leadership styles and approaches worth careful examination in the context of eastern cultural paradigms
Preface: The Nature and Necessity of Hospitality
As Thomas Maier writes, hospitality is βa willingness to receive others when they are in need, an authentic desire to lead and serve others with a specific orientation toward the common good.β Hospitality entails sharing ourselves with others and addressing the needs of people who are marginalized in our society. It therefore promotes equality. The aspects of servant leadership that hospitality requires are discussed
- β¦