A5029860274- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Rare-earth and actinide compounds
- Corporate Taxation and Avoidance
- Magnetic and transport properties of perovskites and related materials
- Quantum, superfluid, helium dynamics
- Electronic and Structural Properties of Oxides
- Chemical Synthesis and Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum many-body systems
- Fusion materials and technologies
- Pancreatic function and diabetes
- Asthma and respiratory diseases
- Respiratory Support and Mechanisms
- Neuropeptides and Animal Physiology
- Nuclear Materials and Properties
- Glycosylation and Glycoproteins Research
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Neonatal Respiratory Health Research
- Noncommutative and Quantum Gravity Theories
- Silk-based biomaterials and applications
- Abdominal vascular conditions and treatments
University of Copenhagen
2013-2024
Materials Design (France)
2024
University of Minnesota
2015-2023
Aalborg University Hospital
1994-2022
University of Nebraska Medical Center
2016
Aarhus University Hospital
2014
Consejo Nacional de Investigaciones Científicas y Técnicas
2011
Solid (South Korea)
2011
Novo Nordisk (Denmark)
1991
Novo Holdings (Denmark)
1984-1989
We obtain the Lifshitz UV completion in a specific model for z=2 geometries. use vielbein formalism which enables identification of all sources as leading components well-chosen bulk fields. show that geometry induced from onto boundary is novel extension Newton-Cartan with torsion tensor. explicitly compute vevs including stress-energy tensor and their Ward identities. After using local symmetries/Ward identities system exhibits 6+6 vevs. The FG expansion exhibits, however, an additional...
For a specific action supporting z = 2 Lifshitz geometries we identify the UV completion by solving for most general solution near boundary. We all sources as leading components of bulk fields which requires vielbein formalism. This includes two linear combinations gauge field and timelike where one asymptotes to boundary other field. The geometry induced from onto is novel extension Newton-Cartan that call torsional (TNC) geometry. There constraint on but its pairing with Ward identity...
The family of metallic kagome compounds $A$V$_3$Sb$_5$ ($A$=K, Rb, Cs) was recently discovered to exhibit both superconductivity and charge order. nature the charge-density wave (CDW) phase is presently unsettled, which complicates interpretation superconducting ground state. In this paper, we use group-theory density-functional theory (DFT) derive solve a phenomenological Landau model for CDW DFT results reveal three unstable phonon modes with same in-plane momentum but different...
Abstract Unconventional superconductors often feature competing orders, small superfluid density, and nodal electronic pairing. While unusual superconductivity has been proposed in the kagome metals A V 3 Sb 5 , key spectroscopic evidence remained elusive. Here we utilize pressure-tuned ultra-low temperature muon spin spectroscopy to uncover unconventional nature of RbV KV . At ambient pressure, observed time-reversal symmetry breaking charge order below...
The authors apply uniaxial strain on the layered kagome superconductor CsV${}_{3}$Sb${}_{5}$. They show that its charge density wave (CDW) and superconductivity (SC) transitions are dominated by change in $c$ axis, effect of explicit rotational symmetry breaking is negligible competition between CDW SC. Together with theoretical studies, they propose trilinear coupling ${M}_{1}^{+}$ ${L}_{2}^{\ensuremath{-}}$ phonon modes plays an important role CDW.
Experiments in the recently discovered vanadium-based kagome metals have suggested that their charge-ordered state displays not only bond distortions, characteristic of a ``real'' charge density wave (rCDW), but also time-reversal symmetry breaking, typical loop currents described by an ``imaginary'' (iCDW). Here, we combine density-functional theory, group and phenomenological modeling to investigate complex states arise from interactions between low-energy van Hove singularities present...
The discovery of superconductivity in layered vanadium-based kagome metals $A$V$_3$Sb$_5$ ($A$: K, Rb, Cs) has added a new family materials to the growing class possible unconventional superconductors. However, nature superconducting pairing these remains elusive. We present microscopic theoretical study leading instabilities on lattice based spin- and charge-fluctuation mediated Cooper pairing. applied methodology includes effects both on-site nearest-neighbor repulsive Coulomb...
Factor VII is a multidomain, vitamin K-dependent plasma glycoprotein that participates in the extrinsic pathway of blood coagulation. Earlier studies demonstrated novel disaccharide (Xyl-Glc) or trisaccharide (Xyl2-Glc) O-glycosidically linked to serine 52 human factor (Nishimura, H., Kawabata, S., Kisiel, W., Hase, Ikenaka, T., Shimonishi, Y., and Iwanaga, S. (1989) J. Biol. Chem. 264, 20320-20325). In present study, recombinant were isolated subjected enzymatic fragmentation. Peptides...
We study a chain of magnetic moments exchange coupled to conventional three dimensional superconductor. In the normal state orders into collinear configuration, while in superconducting phase we find that ferromagnetism is unstable formation spiral state. Beyond weak coupling wavevector greatly exceeds inverse coherence length as result strong spin-spin interaction mediated through subgap band Yu-Shiba-Rusinov states. Moreover, simple description breaks down crosses Fermi energy, wherein...
We study the magnetic and electronic phases of a 1D adatom chain on 2D superconductor. In particular, we confirm existence `self-organized' topologically non-trivial superconducting phase within set subgap Yu-Shiba-Rusinov (YSR) states formed along chain. This is stabilized by incommensurate spiral correlations that arise from competition between short-range ferromagnetic long-range antiferromagnetic electron-induced exchange interactions, similar to recent for 3D superconductor [M. Schecter...
In most magnetically-ordered iron pnictides, the magnetic moments lie in FeAs planes, parallel to modulation direction of spin stripes. However, recent experiments hole-doped pnictides have observed a reorientation from in-plane out-of-plane. Interestingly, this is accompanied by change ground state stripe antiferromagnet tetragonal nonuniform configuration. Motivated these observations, here we investigate origin anisotropy using an itinerant microscopic electronic model that respects all...
Motivated by the recent discovery of superconductivity in kagome ${A\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ $(A=\mathrm{K}, \mathrm{Rb}, \mathrm{Cs})$ metals, we perform a theoretical study symmetry-allowed superconducting orders on two-dimensional lattice with focus their response to disorder. We uncover qualitative difference between robustness intraband spin-singlet (even-parity) and spin-triplet (odd-parity) unconventional atomic-scale nonmagnetic Due particular sublattice character electronic...
Abstract Background Recruitment of brown adipose tissue is a promising strategy to treat obesity and Type 2 diabetes, but the physiological effects large amount metabolically active in humans are unknown. Case report In present paper, we case massive infiltration visceral depot person with diabetes catecholamine‐secreting paraganglioma. The patient was evaluated [18F]‐fludeoxyglucose positron emission tomography/computed tomography on three occasions: pre‐therapy, during α‐blockade...
We present a detailed investigation of the topological phases and Majorana fermion (MF) excitations that arise from bulk interplay between (un)conventional one/two-band spin-singlet superconductivity number magnetic texture crystals. The latter define inhomogeneous magnetization profiles which consist periodically-repeating primitive cell. Here we focus on crystals with cell helix, whirl, skyrmion types, feature distinct symmetry properties. identify multitude accessible harbor flat, uni- or...
Nematic order resulting from the partial melting of density-waves has been proposed as mechanism to explain nematicity in iron-based superconductors. An outstanding question, however, is whether microscopic electronic model for these systems -- multi-orbital Hubbard displays such an ordered state its leading instability. In contrast usual instabilities, magnetic and charge order, this fluctuation-driven phenomenon cannot be captured by standard RPA method. Here, including fluctuations beyond...
We focus on a broad class of tetragonal itinerant systems sharing tendency towards the spontaneous formation incommensurate magnetism with ordering wavevectors $\mathbf{Q}_{1,2}=(\pi-\delta,0)/(0,\pi-\delta)$ or $\mathbf{Q}_{1,2}=(\pi,\delta)/(-\delta,\pi)$. Employing Landau approach, we obtain generic magnetic phase diagram and identify leading instabilities near paramagnetic-magnetic transition. Nine distinct phases exist that either preserve violate assumed $C_4$-symmetry paramagnetic...
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Summary: Progabide (SL 76002) was studied in a randomized double‐blind crossover trial using 20 outpatients suffering from partial complex seizures. added to the concomitant antiepileptic treatment fixed dosage schedule. The design included an open therapy control unit. No significant difference established between number of seizures during with progabide and placebo. A trend observed for lower seizure frequency secondary generalized progabide. Only mild transient side effects were observed....
We present a general study of the magnetic excitations within weak-coupling five-orbital model relevant to itinerant iron pnictides. As function enhanced electronic correlations, spin in symmetry-broken spin-density wave phase evolve from broad low-energy modes limit weak interactions sharply dispersing waves prevailing higher energies at larger interaction strengths. show how resulting response high depends qualitatively on magnitude interactions. also calculate nematic by including an...
Recent experiments in iron pnictide superconductors reveal that, as the putative magnetic quantum critical point is approached, different types of order coexist over a narrow region phase diagram. Although these configurations share same wave vectors, they break distinct symmetries lattice. Importantly, highest superconducting transition temperature takes place close to this proliferation near-degenerate states. In Letter, we employ renormalization group calculation show that such behavior...