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34 papers · 2 filters
Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
Madhab Neupane, Nasser Alidoust, SuYang Xu +15
The Kondo insulator SmB6 has long been known to exhibit low temperature transport anomalies whose origin is of great interest. Here we uniquely access the surface electronic struct…
Signatures of electronic phase separation in the Hall effect of anisotropically strained La0.67Ca0.33MnO3 films
Liuqi Yu, Lingfei Wang, Xiaohang Zhang +4
Systematic transport measurements have been performed on a series of La0.67Ca0.33MnO3 (LCMO) thin films with varying degrees of anisotropic strain. The strain is induced via epitax…
Kondo Destruction and Quantum Criticality in Kondo Lattice Systems
Qimiao Si, J. H. Pixley, Emilian Nica +4
Considerable efforts have been made in recent years to theoretically understand quantum phase transitions in Kondo lattice systems. A particular focus is on Kondo destruction, whic…
Local magnetism and spin correlations in the geometrically frustrated cluster magnet LiZnMoO
J. P. Sheckelton, F. R. Foronda, LiDong Pan +8
LiZnMoO has been proposed to contain MoO magnetic clusters arranged on a triangular lattice with antiferromagnetic nearest-neighbor interactions. H…
Gauge Fluctuations and Interlayer Coherence in Bilayer Composite Fermion Metals
R. Cipri, N. E. Bonesteel
We study the effect of the Chern-Simons gauge fields on the possible transition from two decoupled composite fermion metals to the interlayer coherent composite fermion state propo…
Maximally Entangled Mode, Metal-Insulator Transition and Violation of Entanglement Area Law in Non-interacting Fermion Ground States
Mohammad Pouranvari, Kun Yang
We study in this work the ground state entanglement properties of two models of non-interacting fermions moving in one-dimension (1D), that exhibit metal-insulator transitions. We…
Mottness-induced healing in strongly correlated superconductors
Shao Tang, E. Miranda, V. Dobrosavljevic
We study impurity healing effects in models of strongly correlated superconductors. We show that in general both the range and the amplitude of the spatial variations caused by non…
Ground state uniqueness of the twelve site RVB spin-liquid parent Hamiltonian on the kagome lattice
Zhenyu Zhou, Julia Wildeboer, Alexander Seidel
Anderson's idea of a (short-ranged) resonating valence bond (RVB) spin liquid has been the first ever proposal of what we now call a topologically ordered phase. Since then, a weal…
Miniature Dilatometer Based upon an AFM Piezocantilever
Liran Wang, George M. Schmiedeshoff, David Earl Graf +4
We report on the development of a sensitive dilatometer based upon a AFM piezocantilever. This dilatometer has been tested at temperatures down to 25 mK and in magnetic fields up t…
Superconductivity on the brink of spin-charge order in doped honeycomb bilayer
Oskar Vafek, James M. Murray, Vladimir Cvetkovic
Using a controlled weak-coupling renormalization group approach, we establish the mechanism of unconventional superconductivity in the vicinity of spin or charge ordered excitonic…
Topological defects of Néel order and Kondo singlet formation for Kondo-Heisenberg model on a honeycomb lattice
Pallab Goswami, Qimiao Si
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…
Geometry of Compressible and Incompressible Quantum Hall States: Application to Anisotropic Composite Fermion Liquids
Kun Yang
Haldane's geometrical description of fractional quantum Hall states is generalized to compressible states. It is shown that anisotropy in the composite fermion Fermi surface is a d…
Edge reconstruction of fractional quantum Hall liquids with spin degrees of freedom
Yuhui Zhang, Zi-Xiang Hu, Kun Yang
We study the interplay of confining potential, electron-electron interaction, and Zeeman splitting at the edges of fractional quantum Hall liquids, using numerical diagonalization…
Non-Gaussian Spatial Correlations Dramatically Weaken Localization
Hossein Javan Mard, Eric C. Andrade, Eduardo Miranda +1
We perform variational studies of the interaction-localization problem to describe the interaction-induced renormalizations of the effective (screened) random potential seen by qua…
Re-entrant magnetic field induced charge and spin gaps in the coupled dual-chain quasi-one dimensional organic conductor Perylene[Pt(mnt)]
L. E. Winter, J. S. Brooks, P. Schlottmann +3
An inductive method is used to follow the magnetic field-dependent susceptibility of the coupled charge density wave (CDW) and spin-Peierls (SP) ordered state behavior in the dual…
Multiple quantum phase transitions in a heavy fermion antiferromagnet
L. Jiao, H. Q. Yuan, Y. Kohama +12
We report measurements of magnetic quantum oscillations and specific heat at low temperatures across a field-induced antiferromagnetic quantum critical point (QCP)(B_{c0}\approx50T…
Electrodynamics of BaFe2As2 from infrared measurements under pressure
L. Baldassarre, A. Perucchi, P. Postorino +8
We report on an infrared study on the undoped compound BaFe2As2 as a function of both pressure (up to about 10 GPa) at three temperatures (300, 160, and 110 K). The evolution with…
Mott-Anderson transition in disordered charge transfer model: insights from typical medium theory
W. S. Oliveira, M. C. O. Aguiar, V. Dobrosavljevic
The Mott-Anderson transition in the disordered charge-transfer model displays several new features in comparison to what is found in the disordered single-band Hubbard model, as re…
Magnetic excitations in the spin-1/2 triangular-lattice antiferromagnet CsCuBr
S. A. Zvyagin, M. Ozerov, D. Kamenskyi +8
We report on high-field electron spin resonance (ESR) studies of magnetic excitations in the spin-1/2 triangular-lattice antiferromagnet CsCuBr. Frequency-field diagrams of…
Magnetically originated phonon-glass-like behavior in Tb_2Ti_2O_7 single crystal
Q. J. Li, Z. Y. Zhao, C. Fan +4
We report a study on the thermal conductivity (κ) of Tb_2Ti_2O_7 single crystals at low temperatures. It is found that in zero field this material has an extremely low phonon therm…
Shubnikov-de Haas effect in low electron density SrTiO3: Conduction band edge of SrTiO3 redux
S James Allen, Bharat Jalan, SungBin Lee +5
The Shubnikov-de Haas effect is used to explore the conduction band edge of high mobility SrTiO3 films doped with La. The results largely confirm the earlier measurements by Uwe et…
Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch
S. Ghannadzadeh, J. S. Möller, P. A. Goddard +9
We present the results of high-field magnetization and muon-spin relaxation measurements on the coordination polymer CuF_2(H_2O)_2(pyrazine) in pressures up to 22.5 kbar. We observ…
Tuning Jeff = 1/2 Insulating State via Electron Doping and Pressure in Double-Layered Iridate Sr3Ir2O7
L. Li, P. P. Kong, T. F. Qi +5
Sr3Ir2O7 exhibits a novel Jeff=1/2 insulating state that features a splitting between Jeff=1/2 and 3/2 bands due to spin-orbit interaction. We report a metal-insulator transition i…
Space group symmetry, spin-orbit coupling and the low energy effective Hamiltonian for iron based superconductors
Vladimir Cvetkovic, Oskar Vafek
We construct the symmetry adapted low energy effective Hamiltonian for the electronic states in the vicinity of the Fermi level in iron based superconductors. We use Luttinger's me…