Physics and Astronomy
Recent Submissions
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Orbital-selective superconductivity, gap anisotropy, and spin resonance excitations in a multiorbitalﾠt-J1-J2ﾠmodel for iron pnictides
(2014)We study the orbital-selective superconducting pairing in a five-orbital t-J1-J2 model for iron pnictides. Depending on the orbital selectivity of electron correlations and the orbital characters along the Fermi surface, ... -
Cavity-assisted dynamical spin-orbit coupling in cold atoms
(2014)We consider ultracold atoms subjected to a cavity-assisted two-photon Raman transition. The Raman coupling gives rise to effective spin-orbit interaction which couples the atom's center-of-mass motion to its pseudospin ... -
Topological defects of Néel order and Kondo singlet formation for the Kondo-Heisenberg model on a honeycomb lattice
(2014)Heavy-fermion systems represent a prototypical setting to study magnetic quantum phase transitions. A particular focus has been on the physics of Kondo destruction, which captures quantum criticality beyond the Landau ... -
Enhancing the photocurrent and photoluminescence of single crystal monolayer MoS2ﾠwith resonant plasmonic nanoshells
(2014)Monolayer molybdenum disulfide (MoS2) produced by controlled vapor-phase synthesis is a commercially promising new two-dimensional material for optoelectronics because of its direct bandgap and broad absorption in the ... -
Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies
(2014)There is considerable interest in uncovering the physics of iron-based superconductivity from the alkaline iron selenides, a materials class containing an insulating phase (245 phase) and a superconducting (SC) phase. Due ... -
Effects of electron-electron interactions on the electronic Raman scattering of graphite in high magnetic fields
(2014)We report the observation of strongly temperature (T)-dependent spectral lines in electronic Raman-scattering spectra of graphite in a high magnetic field up to 45 T applied along the c axis. The magnetic field quantizes ... -
Frustration and multicriticality in the antiferromagnetic spin-1 chain
(2014)The antiferromagnetic spin-1 chain has a venerable history and has been thought to be well understood. Here, we show that inclusion of both next-nearest-neighbor (α) and biquadratic (β)interactions results in a rich phase ... -
Thermodynamic properties of Rashba spin-orbit-coupled Fermi gas
(2014)We investigate the thermodynamic properties of a superfluid Fermi gas subject to Rashba spin-orbit coupling and effective Zeeman field. We adopt a T-matrix scheme that takes beyond-mean-field effects, which are important ... -
Finite-Temperature Spin Dynamics in a Perturbed Quantum Critical Ising Chain with an E8 Symmetry
(2014)A spectrum exhibiting E8 symmetry is expected to arise when a small longitudinal field is introduced in the transverse-field Ising chain at its quantum critical point. Evidence for this spectrum has recently come from ... -
Chalker scaling, level repulsion, and conformal invariance in critically delocalized quantum matter: Disordered topological superconductors and artificial graphene
(2014)We numerically investigate critically delocalized wave functions in models of two-dimensional Dirac fermions, subject to vector potential disorder. These describe the surface states of three-dimensional topological ... -
Influence of doping on the spin dynamics and magnetoelectric effect in hexagonalﾠY0.7Lu0.3MnO3
(2014)We use inelastic neutron scattering and dielectric constant measurements to study the doping influence on the spin dynamics and magnetoelectric (ME) effect in hexagonalY0.7Lu0.3MnO3. In undoped YMnO3 and LuMnO3, the Mn ... -
Evolution of London penetration depth with scattering in single crystals of K1−xNaxFe2As2
(2014)London penetration depth, λ(T), was measured in single crystals of K1−xNaxFe2As2, x=0 and 0.07, down to temperatures of 50 mK, ∼Tc/50. Isovalent substitution of Na for K significantly increases impurity scattering, ... -
Quantum Phases of the Shastry-Sutherland Kondo Lattice: Implications for the Global Phase Diagram of Heavy-Fermion Metals
(2014)Considerable recent theoretical and experimental effort has been devoted to the study of quantum criticality and novel phases of antiferromagnetic heavy-fermion metals. In particular, quantum phase transitions have been ... -
Effect of Pnictogen Height on Spin Waves in Iron Pnictides
(2014)We use inelastic neutron scattering to study spin waves in the antiferromagnetic ordered phase of iron pnictide NaFeAs throughout the Brillouin zone. Comparing with the well-studied AFe2As2 (A=Ca, Sr, Ba) family, spin waves ... -
Spin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap
(2014)Motivated by recent experimental breakthroughs in generating spin-orbit coupling in ultracold Fermi gases using Raman laser beams, we present a systematic study of spin-orbit-coupled Fermi gases confined in a quasi-one-dimensional ... -
Range-Separated Brueckner Coupled Cluster Doubles Theory
(2014)We introduce a range-separation approximation to coupled cluster doubles (CCD) theory that successfully overcomes limitations of regular CCD when applied to the uniform electron gas. We combine the short-range ladder channel ... -
Structure and composition of the superconducting phase in alkali iron selenide KyFe1.6+xSe2
(2014)We use neutron diffraction to study the temperature evolution of the average structure and local lattice distortions in insulating and superconducting potassium iron selenide KyFe1.6+xSe2. In the high temperature paramagnetic ... -
Constructing a folding model for protein S6 guided by native fluctuations deduced from NMR structures
(2015)The diversity in a set of protein nuclear magnetic resonance (NMR) structures provides an estimate of native state fluctuations that can be used to refine and enrich structure-based protein models (SBMs). Dynamics are an ... -
Probing dissociative electron attachment through heavy-Rydberg ion-pair production in Rydberg atom collisions
(2016)Electron transfer in collisions between low-n, n = 12, Rydberg atoms and targets that attach low-energy electrons can lead to the formation of heavy-Rydberg ion-pair states comprising a weakly-bound positive-negative ion ... -
Recoupling the singlet- and triplet-pairing channels in single-reference coupled cluster theory
(2016)It is well known that single-reference coupled cluster theory truncated to low orders of excitations gives the right answer for the right reason when systems are dominated by dynamical or weak correlation. Static or strong ...
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