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Jun 17, 2014
Strongly Correlated Electrons
Superconductivity

High temperature superconductivity in cuprates arises from an electronic state that remains poorly understood. We report the observation of a related electronic state in a non-cuprate material Sr2IrO4 in which the unique cuprate Fermiology is largel…

Fermi Arcs in a Doped Pseudospin-1/2 Heisenberg Antiferromagnet

High temperature superconductivity in cuprates arises from an electronic state that remains poorly understood. We report the observation of a related…
Feb 09, 2015
Superconductivity
Strongly Correlated Electrons

Collective nature of spin excitations in superconducting cuprates pro…

We used resonant inelastic x-ray scattering (RIXS) with and without analysis of the scattered photon polarization, to study dispersive spin excitatio…
Jun 07, 2017
Strongly Correlated Electrons
Materials Science
Superconductivity

Topological Phases emerging from Spin-Orbital Physics

We study the evolution of spin-orbital correlations in an inhomogeneous quantum system with an impurity replacing a doublon by a holon orbital degree…
Apr 29, 2008
Materials Science
Strongly Correlated Electrons

Anisotropic magnetization and sign change of dynamic susceptibility i…

The DC and AC magnetic susceptibilities of Na0.85CoO2 single crystals were measured for the different crystal orientations of H//(ab)- and H//(c)-axi…
Nov 17, 2011
Strongly Correlated Electrons
Materials Science
Superconductivity

Resonant magnetic exciton mode in the heavy-fermion antiferromagnet C…

Resonant magnetic excitations are widely recognized as hallmarks of unconventional superconductivity in copper oxides, iron pnictides, and heavy-ferm…
Sep 02, 2016
Mesoscale and Nanoscale Physics

Potential Energy Driven Spin Manipulation via a Controllable Hydrogen…

Spin-bearing molecules can be stabilized on surfaces and in junctions with desirable properties such as a net spin that can be adjusted by external s…
Aug 16, 2018
Strongly Correlated Electrons

Stabilization of three-dimensional charge order in YBa$_2$Cu$_3$O$_…

Incommensurate charge order (CO) has been identified as the leading competitor of high-temperature superconductivity in all major families of layered…
Apr 07, 2017
Superconductivity

In-gap features in superconducting LaAlO$_3$-SrTiO$_3$ interfaces o…

We identified quasiparticle states at well-defined energies inside the superconducting gap of the electron system at the LaAlO$_3$-SrTiO$_3$ interfac…
Feb 20, 2010
Superconductivity
Strongly Correlated Electrons

Weak superconducting pairing and a single isotropic energy gap in s…

We report superconducting (SC) properties of stoichiometric LiFeAs (Tc = 17 K) studied by small-angle neutron scattering (SANS) and angle-resolved ph…
Nov 13, 2014
Optics

Better Randomness with Single Photons

Randomness is one of the most important resources in modern information science, since encryption founds upon the trust in random numbers. Since it i…
Jan 15, 2014
Materials Science
Strongly Correlated Electrons

Characterization of the Spin-1/2 Linear-Chain Ferromagnet CuAs$_2$O$_…

The magnetic and lattice properties of the $S$=1/2 quantum-spin-chain ferromagnet, CuAs$_2$O$_4$, mineral name trippkeite, were investigated. The cry…
May 09, 2015
Mesoscale and Nanoscale Physics

Quantum Engineering of Spin and Anisotropy in Magnetic Molecular Ju…

Single molecule magnets and single spin centers can be individually addressed when coupled to contacts forming an electrical junction. In order to co…
Aug 19, 2015
Computational Physics
Strongly Correlated Electrons

An excited-state approach within full configuration interaction quant…

We present a new approach to calculate excited states with the full configuration interaction quantum Monte Carlo (FCIQMC) method. The approach uses …
Jun 03, 2011
Strongly Correlated Electrons
Materials Science

Quasi-one-dimensional antiferromagnetism and multiferroicity in CuC…

The bulk magnetic properties of the new quasi-one-dimensional Heisenberg antiferromagnet, CuCrO$_4$, were characterized by magnetic susceptibility, h…
Aug 30, 2012
Materials Science
Strongly Correlated Electrons

Floating Zone Growth of Large Single Crystals of SrFeO_3-x

The Fe^{4+}-containing cubic perovskite phase SrFeO_3-x is of interest both for its high-temperature, oxygen-conducting properties as a solid oxide f…
Jul 28, 2010
Strongly Correlated Electrons

Quantum phase transition between antiferromagnetic and charge order i…

We explore the quantum phase transitions between two ordered states in the infinite dimensional Hubbard-Holstein model at half filling. Our study is …
Nov 04, 2008
Strongly Correlated Electrons
Statistical Mechanics

Renormalized phi^6 model for quantum phase transitions in systems of …

We study the impact of quantum and thermal fluctuations on properties of quantum phase transitions occurring in systems of itinerant fermions with ma…
Jul 08, 2007
Mesoscale and Nanoscale Physics

A self-consistent microscopic model of Coulomb interaction in a bilay…

In this work we implement the self-consistent Thomas-Fermi model that also incorporates a local conductivity model to an electron-electron bilayer sy…
Jun 23, 2015
Strongly Correlated Electrons
Materials Science

Novel Spin-Orbital Phases Induced by Orbital Dilution

We demonstrate that magnetic $3d$ impurities with $S=3/2$ spins and no orbital degree of freedom induce changes of spin-orbital order in a $4d^4$ Mot…
Jul 30, 2013
Superconductivity

Theory of quasiparticle scattering interference on the surface of t…

Topological superconductors, such as noncentrosymmetric superconductors with strong spin-orbit coupling, exhibit protected zero-energy surface states…
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