Zero-Field Quantum Critical Point inCeCoIn5

Field-induced quantum critical point in CeCoIn5.

The resistivity of the heavy-fermion superconductor CeCoIn5 was measured as a function of temperature, down to 25 mK and in magnetic fields of up to 16 T applied perpendicular to the basal plane. With increasing field, we observe a suppression of the non-Fermi liquid behavior, rho approximately T, and the development of a Fermi liquid state, with its characteristic rho=rho(0)+AT2 dependence. Th...

Quantum and classical statistics of the electromagnetic zero-point field.

A classical electromagnetic zero-point field ~ZPF! analog of the vacuum of quantum field theory has formed the basis for theoretical investigations in the discipline known as random or stochastic electrodynamics ~SED!. In SED the statistical character of quantum measurements is imitated by the introduction of a stochastic classical background electromagnetic field. Random electromagnetic fluctu...

Comment on "Zero-field Kondo Splitting and Quantum-Critical Transition in Double Quantum Dots".

Double quantum dots offer unique possibilities for the study of many-body correlations. A system containing one Kondo dot and one effectively noninteracting dot maps onto a single-impurity Anderson model with a structured (nonconstant) density of states. Numerical renormalization-group calculations show that, while band filtering through the resonant dot splits the Kondo resonance, the singlet ...

The Zero - Point Field and Inertia

Zero-point term and quantum eects in the Johnson noise of resistors: a critical appraisal

There is a longstanding debate about the zero-point term in the Johnson noise voltage of a resistor. This term originates from a quantumtheoretical treatment of the fluctuation-dissipation theorem (FDT). Is the zero-point term really there, or is it only an experimental artifact, due to the uncertainty principle, for phase-sensitive amplifiers? Could it be removed by renormalization of theories...