Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Panjab UniversityIN1.9k papers
- University of Illinois ChicagoUS1.9k papers
- Purdue University West LafayetteUS1.9k papers
- Centre National de la Recherche ScientifiqueFR1.8k papers
- Florida State UniversityUS1.8k papers
- Fermi National Accelerator LaboratoryUS1.8k papers
- University of RochesterUS1.7k papers
- University of California, RiversideUS1.7k papers
- University of VirginiaUS1.7k papers
- Brown UniversityUS1.7k papers
- Texas A&M UniversityUS1.7k papers
- University of KansasUS1.7k papers
18 papers · 2 filters
Quantum Criticality and the Kondo Lattice
Qimiao Si
Quantum phase transitions (QPTs) arise as a result of competing interactions in a quantum many-body system. Kondo lattice models, containing a lattice of localized magnetic moments…
Incommensurate Magnetism in FeAs Strips: Neutron Scattering from CaFeAs
Yusuke Nambu, Liang L. Zhao, Emilia Morosan +7
Magnetism in the orthorhombic metal CaFeAs was examined through neutron diffraction for powder and single crystalline samples. Incommensurate (${\bm q}_{\rm m}\approx (0.37…
Magnetoelectric coupling at the interface of BiFeO3/La0.7Sr0.3MnO3 multilayers
M. J. Calderon, S. Liang, R. Yu +6
Electric-field controlled exchange bias in a heterostructure composed of the ferromagnetic manganite La0.7Sr0.3MO3 and the ferroelectric antiferromagnetic BiFeO3 has recently been…
Effects of Berry phase and instantons in one dimensional Kondo-Heisenberg model
Pallab Goswami, Qimiao Si
Motivated by the global phase diagram of antiferromagnetic heavy-fermion metals, we study the Kondo effect from the perspective of a nonlinear sigma model in the one dimensional Ko…
Break up of heavy fermions at an antiferromagnetic instability
S. Friedemann, S. Wirth, S. Kirchner +7
We present results of high-resolution, low-temperature measurements of the Hall coefficient, thermopower, and specific heat on stoichiometric YbRh2Si2. They support earlier conclus…
Entropy accumulation near quantum critical points: effects beyond hyperscaling
Jianda Wu, Lijun Zhu, Qimiao Si
Entropy accumulation near a quantum critical point was expected based on general scaling arguments, and has recently been explicitly observed. We explore this issue further in two…
Continuous-Time Monte Carlo study of the pseudogap Bose-Fermi Kondo model
J. H. Pixley, Stefan Kirchner, M. T. Glossop +1
We study the pseudogap Bose-Fermi Anderson model with a continuous-time quantum Monte Carlo (CT-QMC) method. We discuss some delicate aspects of the transformation from this model…
Fermi-surface collapse and dynamical scaling near a quantum critical point
Sven Friedemann, Niels Oeschler, Steffen Wirth +6
Quantum criticality arises when a macroscopic phase of matter undergoes a continuous transformation at zero temperature. While the collective fluctuations at quantum-critical point…
Spin-charge separation in one-dimensional fermion systems beyond the Luttinger liquid theory
Thomas L. Schmidt, Adilet Imambekov, Leonid I. Glazman
We develop a nonperturbative zero-temperature theory for the dynamic response functions of interacting one-dimensional spin-1/2 fermions. In contrast to the conventional Luttinger…
Discontinuous Hall coefficient at the quantum critical point in YbRh2Si2
Sven Friedemann, Niels Oeschler, Steffen Wirth +6
YbRh2Si2 is a model system for quantum criticality. Particularly, Hall effect measurements helped identify the unconventional nature of its quantum critical point. Here, we present…
Spin Dynamics of a Antiferromagnet and its Implications for Iron Pnictides
Pallab Goswami, Rong Yu, Qimiao Si +1
Motivated by the recent observation of antiferromagnetic correlations in the paramagnetic phase of iron pnictides, we study the finite-temperature spin dynamics of a two-dimensiona…
ROHF Theory Made Simple
Takashi Tsuchimochi, Gustavo E. Scuseria
Restricted open-shell Hartree-Fock (ROHF) theory is formulated as a projected self-consistent unrestricted HF (UHF) model by mathematically constraining spin density eigenvalues. T…
Frustration and the Kondo effect in heavy fermion materials
Piers Coleman, Andriy H. Nevidomskyy
The observation of a separation between the antiferromagnetic phase boundary and the small-large Fermi surface transition in recent experiments has led to the proposal that frustra…
Constrained-Pairing Mean-Field Theory. IV. Inclusion of corresponding pair constraints and connection to unrestricted Hartree-Fock theory
Takashi Tsuchimochi, Thomas M. Henderson, Gustavo E. Scuseria +1
Our previously developed Constrained-Pairing Mean-Field Theory (CPMFT) is shown to map onto an Unrestricted Hartree-Fock (UHF) type method if one imposes a corresponding pair const…
Magnetic Bose glass phases of coupled antiferromagnetic dimers with site dilution
Rong Yu, Omid Nohadani, Stephan Haas +1
We numerically investigate the phase diagram of two-dimensional site-diluted coupled dimer systems in an external magnetic field. We show that this phase diagram is characterized b…
Global Phase Diagram of the Kondo Lattice: From Heavy Fermion Metals to Kondo Insulators
Seiji J. Yamamoto, Qimiao Si
We discuss the general theoretical arguments advanced earlier for the T=0 global phase diagram of antiferromagnetic Kondo lattice systems, distinguishing between the established an…
Mott Transition in Multi-Orbital Models for Iron Pnictides
Rong Yu, Qimiao Si
The bad-metal behavior of the iron pnictides has motivated a theoretical description in terms of a proximity to Mott localization. Since the parent compounds of the iron pnictides…
Conducting Jahn-Teller Domain Walls in Undoped Manganites
Juan Salafranca, Rong Yu, Elbio Dagotto
We investigate the electronic properties of multi-domain configurations in models for undoped manganites by means of variational and Monte Carlo techniques. These materials display…