Showing papers in "Annals of Physics in 2006"

TL;DR: In this article, a spin-1/2 system on a honeycomb lattice is studied, where the interactions between nearest neighbors are of XX, YY or ZZ type, depending on the direction of the link; different types of interactions may differ in strength.

TL;DR: In this paper, it was shown that in the absence of coupling of the electrons to any external bath dc electrical conductivity exactly vanishes as long as the temperature T does not exceed some finite value Tc.

TL;DR: In this article, the authors consider the possibility of quantum gravity induced violation of Lorentz symmetry (LV) and present a number of new results which include the explicit computation of rates of the most relevant LV processes, derivation of a new photon decay constraint, and modification of previous constraints taking proper account of the helicity dependence of the LV parameters implied by effective field theory.

TL;DR: In this paper, the Lagrangian for interacting nonrelativistic particles can be coupled to an external gauge field and metric tensor in a way that exhibits a non-relative version of general coordinate invariance.

TL;DR: A fault-tolerant one-way quantum computer on cluster states in three dimensions using methods of topological error correction resulting from a link between cluster states and surface codes is described.

TL;DR: In this article, an innovative technique of integration within an ordered product (IWOP) of operators was proposed, which made the integration of non-commutative operators possible and further revealed the beauty and elegance of Dirac's symbolic method and transformation theory.

TL;DR: In this article, the role of Hochschild cohomology in quantum field theory with particular emphasis on gauge theory and Dyson-Schwinger equations, the quantum equations of motion.

TL;DR: In this paper, the problem of d-dimensional Schrodinger equations with a position-dependent mass is analyzed in the framework of first-order intertwining operators, and a solution to the resulting system of partial differential equations is obtained and used to build a physically relevant model depicting a particle moving in a semi-infinite layer.

TL;DR: In this article, a general class of phantom (p ǫ − 1) matter is discussed, and the authors show that many types of evolution which include both Big-Bang and Big-Rip singularities are admitted and give explicit examples.

TL;DR: In this paper, the conformal partial wave analysis of four-point functions of 1 2 -BPS operators belonging to the SU ǫ(4) [0, p, 0] representation is undertaken.

TL;DR: In this paper, the authors consider the case of the de Sitter symmetry group and affine symmetry group, and show that the Lorentzian signature is the only possible choice for physical spacetime, since the symmetry breaking mechanism works only if the stability subgroup is taken to be the Lorenerz group.

TL;DR: In this article, the authors investigated the transition rate of inertial and uniformly accelerated detectors on the quotient spaces under groups generated by (t, x, y, n, z) and some higher dimensional generalizations.

TL;DR: In this paper, the transport properties of these new electronic phases are investigated and it is shown that they are responsible for the various transport anomalies that have been seen in experiments on the strongly correlated 2DEG in high mobility semiconductor devices with low electron densities.

TL;DR: In this paper, a high resolution angle resolved photoemission spectroscopy (ARPES) study of the electronic properties of graphite was presented, which showed that the nature of the low energy excitations in graphite is particularly sensitive to interlayer coupling as well as lattice disorder.

TL;DR: In this paper, a thorough investigation on formulating and solving quantum problems by extended analytical mechanics that extends canonical variables to complex domain is presented, and it is shown that quantum mechanics becomes a part of analytical mechanics and hence can be treated integrally with classical mechanics.

TL;DR: In this article, the 1PI 1-point function of quantum gravity at one loop order in a locally de Sitter background was computed and the result is a finite constant at this order.

TL;DR: In this article, the authors perform a comparative Monte Carlo study of the easy-plane deconfined critical point (DCP) action and its short-range counterpart to reveal close similarities between the two models for intermediate and strong coupling regimes.

TL;DR: In this article, the universal validity of unitary dynamics and the superposition principle has been confirmed far into the mesoscopic and macroscopic realm in all experiments conducted thus far, and all observed "restrictions" can be correctly and completely accounted for by taking into account environmental decoherence effects.

TL;DR: In this article, the authors present a theoretical description of the electronic properties of graphene in the presence of disorder, electron-electron interactions, and particle-hole symmetry breaking, and show that while particlehole asymmetry and long-range Coulomb interactions lead to the phenomenon of self-doping, local defects determine the transport and spectroscopic properties.

TL;DR: In this article, an explicit manifestly covariant expression for the most general positive-definite and Lorentz-invariant inner product on the space of solutions of the Klein-Gordon equation was derived.

TL;DR: In this paper, the massive Gross-Neveu model is solved in the large-N limit at finite temperature and chemical potential, and the scalar potential is given in terms of Jacobi elliptic functions.

TL;DR: In this article, the Bethe ansatz technique was applied to find the exact ground state energy at zero temperature for any value of interaction strength and density ratio between bosons and fermions.

TL;DR: In this article, the poles of energy eigenvectors of a damped harmonic oscillator are interpreted as resonant states which are responsible for the irreversible quantum dynamics of a DH oscillator.

TL;DR: In this paper, the authors considered the renormalization of the 1/r2 potential in momentum space with a momentum cutoff and absorbed the cutoff dependence using a momentum independent counterterm potential.

TL;DR: The notion of perfect correlations between observables and POVMs was introduced in the standard formulation of quantum mechanics, and characterized by several well-established statistical conditions as discussed by the authors, and the transitivity of perfect correlation is proved to generally hold, and applied to a simple articulation for the failure of Hardy's nonlocality proof for maximally entangled states.

TL;DR: In this article, a pion photoproduction model on the free nucleon based on an Effective Lagrangian Approach (ELA) was proposed, which incorporates a new theoretical treatment of spin-3/2 resonances, first introduced by Pascalutsa, avoiding pathologies present in previous models.

TL;DR: In this article, the authors use renormalization group ideas applied to precise nonperturbative calculations of the infinite cutoff limit to provide 11-12 digits of precision for the binding energies in the cutoff limit.

TL;DR: In this paper, a modified Jaynes-Cummings model is introduced, which consists of a two-level atom interacting with two modes of the electromagnetic field and it is shown that the existence of the second field coupling parameter reduces the amount of squeezing in all quadratures, while the effect of the detuning parameter would lead to the superstructure phenomenon which becomes more pronounced upon increasing the mean photon numbers, in the states which are taken to be converter states.

TL;DR: In this paper, the exact/quasi-exact solvability of Dirac equation with a Lorentz scalar potential based on factorizability of the equation is investigated.

TL;DR: In this paper, the authors investigated the properties of strongly correlated electron systems in the proximity of a Mott insulating phase within the Hubbard model, using a cluster generalization of the dynamical mean field theory.