Concept

Hubbard model

Related publications (230)

Field-induced density wave in the heavy-fermion compound CeRhIn5

Strong electron correlations lead to a variety of distinct ground states, such as magnetism, charge order or superconductivity. Understanding the competitive or cooperative interplay between neighbouring phases is an outstanding challenge in physics. CeRhI ...

2015

Compact modeling of DG-Tunnel FET for Verilog-A implementation

Mihai Adrian Ionescu, Antonios Bazigos, Luca De Michielis, Arnab Biswas

In this work, a compact model based on an analytical closed form solution of the 1D Poisson's equation for a double-gate Tunnel FET is derived. Furthermore, the current levels are estimated by implementing an algorithm based on the Kane's band-to-band tunn ...

IEEE2015

Superstructure of a Substituted Zeolitic Imidazolate Metal-Organic Framework Determined by Combining Proton Solid-State NMR Spectroscopy and DFT Calculations

David Lyndon Emsley

We report the supercell crystal structure of a ZIF-8 analog substituted imidazolate metal-organic framework (SIM-1) obtained by combining solid-state nuclear magnetic resonance and powder X-ray diffraction experiments with density functional theory calcula ...

Wiley-Blackwell2015

Theories of Experimentally Observed Excitation Spectra of Square Lattice Antiferromagnets

Bastien Dalla Piazza

The first part of this thesis presents the theoretical study of an anomaly of unknown origin in the excitation spectrum of the Quantumspin-1/2 Heisenberg Square lattice Anti-Ferromagnet. The anomaly manifests itself in Inelastic Neutron Scattering data for ...

EPFL2014

High-temperature Mott transition in wide-band-gap semiconductor quantum wells

Nicolas Grandjean, Jean-François Carlin, Benoît Marie Joseph Deveaud, Raphaël Butté, Jacques Levrat, Jean-Daniel Ganière, Gwénolé Jean Jacopin, Georg Rossbach, Mehran Shahmohammadi

The crossover from an exciton gas to an electron-hole plasma is studied in a GaN/(Al,Ga)N single quantum well by means of combined time-resolved and continuous-wave photoluminescence measurements. The two-dimensional Mott transition is found to be of conti ...

2014

Anderson Tower of States and Nematic Order of Spin-1 Bosonic Atoms on a 2D Lattice

Frédéric Mila, Hongyu Yang

We investigate the structure of the spectrum of antiferromagnetically coupled spin-1 bosons on a square lattice using degenerate perturbation theory and exact diagonalizations of finite clusters. We show that the superfluid phase develops an Anderson tower ...

2014

The electronic structure of the high-symmetry perovskite iridate Ba2IrO4

Henrik Moodysson Rønnow, Marco Grioni, Johan Juul Chang, Luca Moreschini, Simon Karl Moser, Bastien Dalla Piazza

We report angle-resolved photoemission (ARPES) measurements, density functional and model tight-binding calculations on Ba2IrO4 (Ba-214), an antiferromagnetic (T-N = 230 K) insulator. Ba-214 does not exhibit the rotational distortion of the IrO6 octahedra ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2014

Minimum energy path and atomistic mechanism of the elementary step in oxygen diffusion in silicon: A density-functional study

Alfredo Pasquarello, Jan Felix Binder

Using a density-functional scheme, we study the migration of a single O atom in a (110) plane between two adjacent bond-center sites in bulk Si. The minimum energy migration path is found through the nudged elastic band method within a generalized gradient ...

American Physical Society2014

Spin-correlated electronic state on the surface of a spin-orbit Mott system

Jan Hugo Dil, Chang Liu

We use angle-resolved photoemission spectroscopy to show that the near-surface electronic structure of a bulk insulating iridate Sr3Ir2O7 lying near a metal-Mott insulator transition exhibits weak metallicity signified by finite electronic spectral weight ...

2014

Topological Aspects of Charge-Carrier Transmission across Grain Boundaries in Graphene

Oleg Yazyev, Fernando Gargiulo

Dislocations and grain boundaries are intrinsic topological defects of large-scale polycrystalline samples of graphene. These structural irregularities have been shown to strongly affect electronic transport in this material. Here, we report a systematic i ...

Amer Chemical Soc2014

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