27 research outputs found
Nodes in the Gap Function of LaFePO, the Gap Function of the Fe(Se,Te) Systems, and the STM Signature of the s Pairing
We reiterate, in more details, our previous proposal of using quasi-particle
interference to determine the pairing form factor in iron-based
superconductors. We also present our functional renormalization group(FRG)
results on LaFePO and Fe(Se,Te) superconductors. In particular we found that
the leading pairing channel in LaFePO is nodal s, with nodes on
electron Fermi surfaces. For Fe(Se,Te) system we found fully gapped s
pairing, with substantial gap anisotropy on electron Fermi surfaces, and large
gap is concentrated in regions with dominant orbital character. We further
fit the form factor obtained by FRG to real space orbital basis pairing
picture, which shows more clearly the differences between different iron-based
superconductors.Comment: 8 pages, 6 figures, 1 table, RevTex4, references update
The electronic instabilities of the Iron-based superconductors: a variational Monte-Carlo study
We report the first variational Monte Carlo (VMC) study of the iron-based
superconductors. We use realistic band structures, and the ordering
instabilities/variational ansatzs are suggested by previous functional
renormalization group calculations. We examine antiferromagnetism,
superconducting pairing, normal state fermi surface distortion, and orbital
order in the antiferromagnetic state.Comment: Journal reference: Phys. Rev. B 83, 134502 (2011
Antiferromagnetically Driven Electronic Correlation in Iron Pnictides and Cuprates
The iron pnictides and the cuprates represent two families of materials,
where strong antiferromagnetic correlation drives three other distinct ordering
tendencies: (1) superconducting pairing, (2) Fermi surface distortion, and (3)
orbital current order. We propose that (1)-(3) and the antiferromagnetic
correlation are the hallmarks of a class of strongly correlated materials to
which the cuprates and pnictides belong. In this paper we present the results
of the functional renormalization group studies to support the above claim. In
addition, we show that as a function of the interlayer hopping parameter, the
double layer Hubbard model nicely interpolates between the cuprate and the iron
pnictide physics. Finally, as a check, we will present the renormalization
group study of a ladder version of the iron pnictide, and compare the results
to those of the two-dimensional model.Comment: 18 pages, 20 figures, revised version, one more figure added and
references update
Nodal Spin Density Wave and band topology of the FeAs based materials
The recently discovered FeAs-based materials exhibit a Spin Density
Wave (SDW) in the undoped state, which gives way to superconductivity upon
doping. Here we show that due to an interesting topological feature of the band
structure, the SDW state cannot acquire a full gap. This is demonstrated within
the SDW mean-field theory of both a simplified two band model and a more
realistic 5-band model. The positions of the nodes are different in the two
models and can be used to detected the validity of each model.Comment: rewritten for clarit
A Numerical Renormalization Group Study of the Superconducting and Spin Density Wave Instabilities in MFeAsOF Compounds
We apply the fermion renormalization group method, implemented numerically by
Honerkamp et.al., to a two-band model of FeAs-based materials. At half filling
we find the or spin density wave order and a sub-dominant
superconducting pairing tendency. Due to a topological reason, the spin density
wave gap has nodes on the fermi surfaces. Away from half filling we find an
unconventional s-wave and a sub-dominant pairing instability. The
former has symmetry around the hole fermi surface but exhibits
symmetry around the electron pockets where the 90 degree
rotation is broken. The pairing mechanism is inter-pocket pair hopping.
Interestingly, the same interaction also drives the antiferromagnetism.Comment: 5 pages, 4 figures, RevTex4. Since the two-band model is insufficient
to describe the iron pnictides, this paper will not be submitted for
publication. Please see arXiv: 0807.0498 for improved work for five-band
mode
Antiferromagnetic Correlation and the Pairing Mechanism of the Cuprates and Iron Pnictides : a View From the Functional Renormalization Group Studies
We compare the one-loop functional renormalization group results for the
cuprates and the iron pnictides. Interestingly a coherent picture suggesting
that antiferromagnetic correlation causes pairing for both materials emerges.Comment: 4 pages, 5 figures. Proposal for detecting out of phase s-wave
pairing symmetry via STM is adde
Pairing symmetry and properties of iron-based high temperature superconductors
Pairing symmetry is important to indentify the pairing mechanism. The
analysis becomes particularly timely and important for the newly discovered
iron-based multi-orbital superconductors. From group theory point of view we
classified all pairing matrices (in the orbital space) that carry irreducible
representations of the system. The quasiparticle gap falls into three
categories: full, nodal and gapless. The nodal-gap states show conventional
Volovik effect even for on-site pairing. The gapless states are odd in orbital
space, have a negative superfluid density and are therefore unstable. In
connection to experiments we proposed possible pairing states and implications
for the pairing mechanism.Comment: 4 pages, 1 table, 2 figures, polished versio
Short-term outcomes of laparoscopic local resection for gastric submucosal tumors: a single-center experience of 266 patients
Abstract Background Laparoscopic resections for submucosal tumors (SMTs) of the stomach have been developed rapidly over the past decade. Several types of laparoscopic methods for gastric SMTs have been created. We assessed the short-term outcomes of two commonly used types of laparoscopic local resection (LLR) for gastric SMTs and reported our findings. Methods We retrospectively analyzed the clinicopathological results of 266 patients with gastric SMTs whom underwent LLR between January 2006 and September 2016. 228 of these underwent laparoscopic exogastric wedge resection (LEWR), the remaining 38 patients with the tumors near the esophagogastric junction (EGJ) or antrum underwent laparoscopic transgastric resection (LTR). Results All the patients underwent laparoscopic resections successfully. The mean operation times of LEWR and LTR were 90.2 ± 37.2 min and 101.7 ± 38.5 min respectively. The postoperative length of hospital stays for LEWR and LTR were 5.1 ± 2.1 days and 5.3 ± 1.7 days respectively. There was a low complication rate (4.4%) and zero mortality in our series. Conclusion ELWR is technically feasible therapy of gastric SMTs. LTR is secure and effective for gastric intraluminal SMTs located near the EGJ or antrum
Visible Light-Driven Photocatalytic Performance of N-Doped ZnO/g-C3N4 Nanocomposites
Abstract N-doped ZnO/g-C3N4 composites have been successfully prepared via a facile and cost-effective sol-gel method. The nanocomposites were systematically characterized by XRD, FE-SEM, HRTEM, FT-IR, XPS, and UV-vis DRS. The results indicated that compared with the pure N-doped ZnO, the absorption edge of binary N-doped ZnO/g-C3N4 shifted to a lower energy with increasing the visible-light absorption and improving the charge separation efficiency, which would enhance its photocatalytic activity. Compared with the pure g-C3N4, ZnO, N-doped ZnO and the composite ZnO/g-C3N4, the as-prepared N-doped ZnO/g-C3N4 exhibits a greatly enhanced photocatalytic degradation of methylene blue and phenol under visible-light irradiation. Meanwhile, N-doped ZnO/g-C3N4 possesses a high stability. Finally, a proposed mechanism for N-doped ZnO/g-C3N4 is also discussed. The improved photocatalysis can be attributed to the synergistic effect between N-doped ZnO and g-C3N4, including the energy band structure and enhanced charge separation efficiency