Nuclear shape-phase diagrams

Liu, M. L.

doi:10.1103/physrevc.76.054304

Cited by 39 publications

(74 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, we note that the zero-bias conductance peak in a ͓110͔-oriented interface widely observed in the point-contact spectroscopy on hole-doped cuprates was rarely observed 84 in their electron-doped counterparts, both of which have the d x 2 −y 2-wave pairing symmetry. It has been argued recently 85 that the absence of the ZBCP is also due to the coexistence of the antiferromagnetic and superconducting ordering. Although we consider here a multiband model for the iron pnictides, the anomaly observed in two types of superconducting systems may share the origin.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Vortex core states in a minimal two-band model for iron-based superconductors

2009

View full text Add to dashboard Cite

The pairing symmetry is one of the major issues in the study of iron-based superconductors. We adopt a minimal two-band tight-binding model with various channels of pairing interaction, and derive a set of twoband Bogoliubov-de Gennes ͑BdG͒ equations. The BdG equations are implemented in real space and then solved self-consistently via exact diagonalization. In the uniform case, we find that the d x 2 −y 2-wave pairing state is most favorable for a nearest-neighbor pairing interaction while the s x 2 y 2-wave pairing state is most favorable for a next-nearest-neighbor pairing interaction, which is consistent with that reported by Seo et al. ͓Phys. Rev. Lett. 101, 206404 ͑2008͔͒. We then proceed to study the local electronic structure around a magnetic vortex core for both d x 2 −y 2-wave and s x 2 y 2-wave pairing symmetry in the mixed state. It is found from the local density of states spectra and its spatial variation that the resonance core states near the Fermi energy for the d x 2 −y 2-wave pairing symmetry are bound while those for the s x 2 y 2-wave pairing symmetry can evolve from the localized states into extended ones with varying electron filling factor. Furthermore, by including an effective exchange interaction, the emergent antiferromagnetic spin-density-wave order can suppress the resonance core states, which provides one possible avenue to understand the absence of resonance peak as revealed by recent scanning tunneling microscopy experiment by Yin et al. ͓Phys. Rev. Lett. 102, 097002 ͑2009͔͒.

show abstract

Section: Numerical Results and Discussionmentioning

confidence: 99%

Vortex core states in a minimal two-band model for iron-based superconductors

2009

View full text Add to dashboard Cite

show abstract

“…Note that recent work considers whether the form of S used to interpret atomic EDMs should be modified [25,26]. The isovector coupling has been calculated in terms of chromo-EDMs of the quarks, givingḡ [15].…”

Section: D(mentioning

confidence: 99%

Improved Limit on the Permanent Electric Dipole Moment ofHg199

et al. 2009

View full text Add to dashboard Cite

We report the results of a new experimental search for a permanent electric dipole moment of 199 Hg utilizing a stack of four vapor cells. We find d( 199 Hg) = (0.49±1.29stat ±0.76syst)×10 −29 e cm, and interpret this as a new upper bound, |d( 199 Hg)| < 3.1×10 −29 e cm (95% C.L.). This result improves our previous 199 Hg limit by a factor of 7, and can be used to set new constraints on CP violation in physics beyond the standard model. PACS numbers: 11.30.Er,32.10.Dk,32.80.Xx,24.80.+y The existence of a finite permanent electric dipole moment (EDM) of a particle or atom would violate time reversal symmetry (T ), and would also imply violation of the combined charge conjugation and parity symmetry (CP ) through the CP T theorem [1,2,3]. EDMs are suppressed in the standard model of particle physics (SM), lying many orders of magnitude below current experimental sensitivity. However, it is thought that additional sources of CP violation are needed to account for baryogenesis [4,5], and many theories beyond the SM, such as supersymmetry [6,7], naturally predict EDMs within experimental reach.Experimental searches for EDMs have so far yielded null results. The most precise and significant limits have been set on the EDM of the neutron [8], the electron [9], and the 199 Hg atom [10], leading to tight constraints on supersymmetric extensions of the SM [7]. Here we report the first result of a new mercury experiment, |d( 199 Hg)| < 3.1×10−29 e cm (95% C.L.), which improves our previous limit [10] by a factor of 7 and provides a yet more exacting probe of possible new sources of CP violation.199 Hg has a 1 S 0 electronic ground state and nuclear spin 1/2. An EDM of the ground state atom would point along the nuclear spin axis and arise mainly from CP violation in the nucleus. We measure the nuclear Larmor frequency ν given by hν = |2µB ± 2dE|, where µ and d are the 199 Hg magnetic and electric dipole moments, and B and E are the magnitudes of external magnetic and electric fields aligned parallel (+) or antiparallel (−) with each other. The signature for d = 0 is thus a shift in Larmor frequency when E is reversed relative to B.As shown in Fig. 1, our new apparatus uses a stack of four spin-polarized Hg vapor cells in a common B-field. The middle two cells have oppositely directed E-fields, resulting in EDM-sensitive Larmor shifts of opposite sign; the outer two cells, enclosed by the high voltage (HV) electrodes and thus placed at E = 0, are free of EDM effects and serve to cancel B-field gradient noise and provide checks for spurious HV-correlated B-field shifts.The vapor cells are constructed from high purity fused silica and contain isotopically enriched 199 Hg (92 %) at a density of 4 × 10 13 cm −3 , a paraffin wall coating, and 475 Torr of CO buffer gas. CO efficiently quenches excited state 199 Hg and thus reduces degradation of the wall coating [11]. Spin coherence times T 2 are 100 to 200 sec. A conductive SnO coating on the cell end-caps provides electric field plates separated by 11 mm. The average leakage...

show abstract

“…At the same incident energy, isospin diffusion was investigated. We remind that isospin diffusion in HIC depends on the different N/Z asymmetries of the involved projectiles and targets, hence it is used to probe the symmetry energy [84][85][86]. The full black circle shows the results from isospin diffusion observables measured for collisions at a lower beam energy of 35 MeV per nucleon [87].…”

Section: Comparison With Phenomenologymentioning

confidence: 99%

Nuclear matter equation of state from a quark-model nucleon-nucleon interaction

et al. 2015

View full text Add to dashboard Cite

Starting from a realistic constituent quark model for the nucleon-nucleon interaction, we derive the equation of state (EOS) of nuclear matter within the Bethe-Brueckner-Goldstone approach up to three-hole-line level, without need to introduce three-nucleon forces. To estimate the uncertainty of the calculations both the gap and the continuous choices for the single-particle potential are considered and compared. The resultant EOS is compatible with the phenomenological analysis on the saturation point, the incompressibility, the symmetry energy at low density and its slope at saturation, together with the high-density pressure extracted from flow data on heavy ion collisions. Although the symmetry energy is appreciably larger in the gap choice in the high-density region, the maximum neutron star masses derived from the continuous-choice EOS and the gapchoice EOS are similar and close to two solar masses, which is again compatible with recent observational data. Comparison with other microscopic EOS is presented and discussed.

show abstract

Nuclear shape-phase diagrams

Cited by 39 publications

References 19 publications

Vortex core states in a minimal two-band model for iron-based superconductors

Vortex core states in a minimal two-band model for iron-based superconductors

Improved Limit on the Permanent Electric Dipole Moment ofHg199

Nuclear matter equation of state from a quark-model nucleon-nucleon interaction

Contact Info

Product

Resources

About