Publications related to Quantum phase transition

Unconventional quantum ordered and disordered states in the highly frustrated spin-1/2 Ising-Heisenberg model on triangles-in-triangles lattices

The spin-1/2 Ising-Heisenberg model on two geometrically related triangles-in-triangles lattices is exactly solved through the generalized star-triangle transformation, which establishes a rigorous mapping correspondence with the effective spin-1/2 Ising m ...

Amer Physical Soc2013

Emergence and Detection of Exotic Phases in Spin-1 Systems

Frédéric Alexis Michaud

This work is devoted to the study of spin S = 1 systems, and more precisely to the emergence of exotic quantum phases in such systems, and to the establishment of tools to observe such phases. It is split in four main chapters. In the first chapter, we sho ...

EPFL2013

Signatures of a Pressure-Induced Topological Quantum Phase Transition in BiTeI

Helmuth Berger

We report the observation of two signatures of a pressure-induced topological quantum phase transition in the polar semiconductor BiTeI using x-ray powder diffraction and infrared spectroscopy. The x-ray data confirm that BiTeI remains in its ambient-press ...

Amer Physical Soc2013

Critical Resistance at the Superconductor-Insulator Transition in Hole-Doped Cuprates

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

Here, we show that in several p-type cuprates, the superconductor-to-insulator transition (SIT) occurs at the critical sheet resistance approximately equal to the quantum resistance of pairs, RQ=h/4

e^{2}

=6.5 kΩ. In a relatively broad range of temperature ...

Springer Verlag2013

Unconventional mechanisms of magnetic ordering in frustrated models of quantum magnetism

Tommaso Coletta

In this thesis we investigate in the semiclassical approximation how unconventional magnetic ordering, that is magnetic ordering which is not predicted at the classical level, emerges in a variety of frustrated models of quantum magnetism. The first part o ...

EPFL2013

Multiferroicity in the generic easy-plane triangular lattice antiferromagnet RbFe(MoO4)(2)

Jonathan White

RbFe(MoO4)(2) is a quasi-two-dimensional (quasi-2D) triangular lattice antiferromagnet (TLA) that displays a zero-field magnetically driven multiferroic phase with a chiral spin structure. By inelastic neutron scattering, we determine quantitatively the sp ...

American Physical Society2013

Dipolar Antiferromagnetism and Quantum Criticality in LiErF4

Henrik Moodysson Rønnow, Gabriel Aeppli, Bastien Dalla Piazza, Julian Piatek, Neda Nikseresht Ghanepour, Nikolay Tsyrulin, Conradin Kraemer

Magnetism has been predicted to occur in systems in which dipolar interactions dominate exchange. We present neutron scattering, specific heat, and magnetic susceptibility data for LiErF4, establishing it as a model dipolar-coupled antiferromagnet with pla ...

2012

Classical and Quantum Critical Phenomena in the Dipolar Antiferromagnet LiErF4

Neda Nikseresht Ghanepour

The collective behavior of systems consisting of interacting dipoles is a subject of considerable studies. The anisotropic nature of such interactions opens an arena to explore fundamental questions in correlated electron physics, ranging from quantum enta ...

EPFL2012

Evidence for Columnar Order in the Fully Frustrated Transverse Field Ising Model on the Square Lattice

Frédéric Mila, Tommaso Coletta, Sandro Wenzel

Using extensive classical and quantum Monte Carlo simulations, we investigate the ground-state phase diagram of the fully frustrated transverse field Ising model on the square lattice. We show that pure columnar order develops in the low-field phase above ...

2012

Vanishing of the metal-insulator Peierls transition in pressurized BaVS3

Helmuth Berger

BaVS3 presents a metal-to-insulator (MI) transition at ambient pressure due to the stabilization of a 2k(F) commensurate charge density wave (CDW) Peierls ground state built on the dz(2) V orbitals. The MI transition vanishes under pressure at a quantum cr ...

Amer Physical Soc2012

Quantum phase transition

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Unconventional quantum ordered and disordered states in the highly frustrated spin-1/2 Ising-Heisenberg model on triangles-in-triangles lattices

Emergence and Detection of Exotic Phases in Spin-1 Systems

Signatures of a Pressure-Induced Topological Quantum Phase Transition in BiTeI

Critical Resistance at the Superconductor-Insulator Transition in Hole-Doped Cuprates

Unconventional mechanisms of magnetic ordering in frustrated models of quantum magnetism

Multiferroicity in the generic easy-plane triangular lattice antiferromagnet RbFe(MoO4)(2)

Dipolar Antiferromagnetism and Quantum Criticality in LiErF4

Classical and Quantum Critical Phenomena in the Dipolar Antiferromagnet LiErF4

Evidence for Columnar Order in the Fully Frustrated Transverse Field Ising Model on the Square Lattice

Vanishing of the metal-insulator Peierls transition in pressurized BaVS3

Unconventional quantum ordered and disordered states in the highly frustrated spin-1/2 Ising-Heisenberg model on triangles-in-triangles lattices

Vanishing of the metal-insulator Peierls transition in pressurized BaVS3

Evidence for Columnar Order in the Fully Frustrated Transverse Field Ising Model on the Square Lattice

Classical and Quantum Critical Phenomena in the Dipolar Antiferromagnet LiErF4

Dipolar Antiferromagnetism and Quantum Criticality in LiErF4

Multiferroicity in the generic easy-plane triangular lattice antiferromagnet RbFe(MoO4)(2)

Unconventional mechanisms of magnetic ordering in frustrated models of quantum magnetism

Critical Resistance at the Superconductor-Insulator Transition in Hole-Doped Cuprates

Signatures of a Pressure-Induced Topological Quantum Phase Transition in BiTeI

Emergence and Detection of Exotic Phases in Spin-1 Systems