Publications related to Quantum critical point

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

Manifestation of the spin textures in the thermopower of MnSi

László Forró, Ana Akrap, Stevan Arsenijevic

To identify possible spin texture contributions to thermoelectric transport, we present a detailed temperature and pressure dependence of thermopower S in MnSi, as well as a lowtemperature study of S in a magnetic field. We find that S/T reconstructs the ( ...

Epl Association, European Physical Society2013

Berry phase investigation of spin-S ladders

Frédéric Mila, Natalia Chepiga, Frédéric Alexis Michaud

We investigate the properties of antiferromagnetic spin-S ladders with the help of local Berry phases defined by imposing a twist on one or a few local bonds. In gapped systems with time-reversal symmetry, these Berry phases are quantized, hence able in pr ...

2013

Quantum Monte Carlo Study of a Resonant Bose-Fermi Mixture

Gianluca Bertaina, Elisa Fratini

We study a resonant Bose-Fermi mixture at zero temperature by using the fixed-node diffusion Monte Carlo method. We explore the system from weak to strong boson-fermion interaction, for different concentrations of the bosons relative to the fermion compone ...

2013

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

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

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

Thermopower as a Unique Tool to Probe Quantum Phase Transitions

Stevan Arsenijevic

In my thesis, transport measurements such as resistivity and, more importantly, thermopower S, were used to explore the phase diagram of bad metals. Bad metals are electronically correlated systems whose ground state lies close to a quantum phase transitio ...

EPFL2012

Electric field effect on superconductivity in $La_{2-x}$$Sr_{x}$$CuO_{4}$

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

We demonstrate a method to tune the carrier concentration of a high temperature superconductor over a wide range, using an applied electric field. Thin film devices were made in an electrical double layer transistor configuration utilizing an ionic liquid. ...

American Institute of Physics2012

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

Quantum critical point

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

Manifestation of the spin textures in the thermopower of MnSi

Berry phase investigation of spin-S ladders

Quantum Monte Carlo Study of a Resonant Bose-Fermi Mixture

Unconventional mechanisms of magnetic ordering in frustrated models of quantum magnetism

Vanishing of the metal-insulator Peierls transition in pressurized BaVS3

Dipolar Antiferromagnetism and Quantum Criticality in LiErF4

Thermopower as a Unique Tool to Probe Quantum Phase Transitions

Electric field effect on superconductivity in $La_{2-x}$$Sr_{x}$$CuO_{4}$

Classical and Quantum Critical Phenomena in the Dipolar Antiferromagnet LiErF4

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

Manifestation of the spin textures in the thermopower of MnSi

Vanishing of the metal-insulator Peierls transition in pressurized BaVS3

Unconventional mechanisms of magnetic ordering in frustrated models of quantum magnetism

Classical and Quantum Critical Phenomena in the Dipolar Antiferromagnet LiErF4

Electric field effect on superconductivity in $La_{2-x}$$Sr_{x}$$CuO_{4}$

Thermopower as a Unique Tool to Probe Quantum Phase Transitions

Dipolar Antiferromagnetism and Quantum Criticality in LiErF4

Quantum Monte Carlo Study of a Resonant Bose-Fermi Mixture

Berry phase investigation of spin-S ladders