arXiv: Strongly Correlated Electrons

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We report a systematic study of low energy metastable states in van der Waals semimetals TiS2, TiSe2 and TiTe2 within the DFT theory by means the evolutionary search algorithm. We find a big difference between TiSe2, TiS2 and TiTe2 in low energy metastable states. While several metastable states exist in TiSe2 and TiS2, no low energy metastable states were found in TiTe2. We show that some of the obtained metastable states can be identified as charge density wave (CDW). We argue that existence o...

We report electronic band structure calculations for Sr_{4}u_{3}_{10}that displays both ferromagnetic and metamagnetic behavior. The density functional calculations find the ground state to be ferromagnetic in agreement with the experiment and we find that the inclusion of Coulomb Hubbard interaction U applied to the Ru 4d states has dramatic effects on the Fermi surface, which reveal the role of Coulomb interactions and correlated many-body physics. The minority spin bands are mainly e...

Kondo effect is a prominent quantum phenomenon describing the many-body screening of a local magnetic impurity. Here, we reveal a new type of non-magnetic Kondo behavior generated by gauge fluctuations in strongly-correlated baths. We show that a non-magnetic bond defect not only introduces the potential scattering but also locally enhances the gauge fluctuations. The local gauge fluctuations further mediate a pseudospin exchange interaction that produces an asymmetric Kondo fixed point in low-e...

Antiferromagnetic spintronics is an emerging area of quantum technologies that leverage the coupling between spin and orbital degrees of freedom in exotic materials. Spin-orbit interactions allow spin or angular momentum to be injected via electrical stimuli to manipulate the spin texture of a material, enabling the storage of information and energy. In general, the physical process is intrinsically local: spin is carried by an electrical current, imparted into the magnetic system, and the spin ...

Magnons and Spinons in \mathrm{Ba}_2\mathrm{CoTeO}_6 A Composite System of Isolated Spin-1/2Triangular Heisenberg-like and Frustrated Honeycomb Ising-like Antiferromagnets

We report the neutron scattering results on magnetic orderings and excitations in \mathrm{Ba}_2\mathrm{CoTeO}_6composed of two almost isolated subsystems A and B, which are described as an S\,{=}\,1/2triangular Heisenberg-like antiferromagnet and a frustrated honeycomb Ising-like antiferromagnet, respectively. Stripy ordering of subsystem B was confirmed below T_{\rm N1}\,{=}\,12.0K, whereas sharp streaks were observed along (1/3, 1/3, L)and (2/3, 2/3, L)at 0.3 K (${\ll}\,T_{\rm N...

Quantum magnetic properties and metal-to-insulator transition in chemically doped calcium ruthenate perovskite.

Ruthenates provide comprehensive platform to study a plethora of novel properties, such as quantum magnetism, superconductivity and magnetic fluctuation mediated metal-insulator transition. In this article, we provide an overview of quantum mechanical phenomenology in calcium ruthenium oxide with varying compositions. While the stochiometric composition of CaRuO_{3}exhibits non-Fermi liquid behavior with quasi-criticality, chemically doped compounds depict prominent signatures of quantum magn...

Interplay between quadrupolar and magnetic interactions in 5d^{1}double perovskite Ba_2gReO_6under pressure.

We measured the electrical resistivity, AC magnetic susceptibility, and specific heat of the cubic double perovskite Ba_2gReO_6under pressure. The application of pressure leads to a gradual increase in the transition temperature to the canted antiferromagnetic order, while the quadrupolar order is suppressed above 5 GPa, at which a collinear antiferromagnetic state appears. The obtained unit cell volume-temperature phase diagram for the compound as well as the related compounds suggests th...

Relativistic Mott insulators known as 'Kitaev materials' potentially realize spin liquids hosting non-Abelian anyons. Motivated by fault-tolerant quantum-computing applications in this setting, we introduce a dynamical anyon-generation protocol that exploits universal edge physics. The setup features holes in the spin liquid, which define energetically cheap locations for non-Abelian anyons, connected by a narrow bridge that can be tuned between spin liquid and topologically trivial phases. We s...

Two-leg spin-\frac12ladders with anisotropy and two different dimerization patterns are analyzed at zero temperature. This model is equivalent to a modulated interacting (Kitaev) ladder. The Hartree-Fock mean-field approximation reduces the model to a sum of two quadratic effective Majorana Hamiltonians, which are dual to a sum of two (even/odd) XY quantum chains in the alternating transverse fields. The mapping between the effective Hamiltonian of the ladder and the pair of the dual XY chain...

Spin-1/2 maple leaf lattice antiferromagnets are expected to show interesting phenomena originating from frustration effects and quantum fluctuations. We report the hydrothermal synthesis of a powder sample of bluebellite Cu_6O_3OH)_{10}l as a first potential candidate. Magnetization and heat capacity measurements reveal moderate frustration with a Curie-Weiss temperature of -35K, and a magnetic transition at T_N= 17 K. Surprisingly, the magnetic susceptibility and heat capacity a...

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