Zobrazeno 1 - 10
of 214
pro vyhledávání: '"A. Dillenschneider"'
The entanglement of hard-core bosons in square and honeycomb lattices with nearest-neighbor interactions is estimated by means of quantum Monte Carlo simulations and spin-wave analysis. The particular U(1)-invariant form of the concurrence is used to
Externí odkaz:
http://arxiv.org/abs/1811.00014
Publikováno v:
Phys. Rev. B 89, 155406 (2014)
We study the entanglement of magnetic impurities in an environment of electrons through successive scattering while an external magnetic field is applied. We show that the dynamics of the problem can be approximately described by a reduced model of t
Externí odkaz:
http://arxiv.org/abs/1401.0005
Publikováno v:
Phys. Rev. B 84, 174515 (2011)
Hard-core bosons on a triangular lattice with nearest neighbor repulsion are a prototypical example of a system with supersolid behavior on a lattice. We show that in this model the physical origin of the supersolid phase can be understood quantitati
Externí odkaz:
http://arxiv.org/abs/1106.0006
Autor:
Dillenschneider, Raoul, Lutz, Eric
Publikováno v:
Phys. Rev. E 80, 042101 (2009)
We consider a driven quantum harmonic oscillator strongly coupled to a heat bath. Starting from the exact quantum Langevin equation, we use a Green's function approach to determine the corresponding semiclassical equation for the Wigner phase space d
Externí odkaz:
http://arxiv.org/abs/0904.0950
Autor:
Dillenschneider, Raoul, Lutz, Eric
Publikováno v:
Phys. Rev. Lett. 102, 210601 (2009)
We consider an overdamped nanoparticle in a driven double-well potential as a generic model of an erasable one-bit memory. We study in detail the statistics of the heat dissipated during an erasure process and show that full erasure may be achieved b
Externí odkaz:
http://arxiv.org/abs/0811.4351
Autor:
Dillenschneider, Raoul
Publikováno v:
Phys. Rev. B 78, 224413 (2008)
Quantum phase transitions of the transverse Ising and antiferromagnetic XXZ spin S=1/2 chains are studied using quantum discord. Quantum discord allows the measure of quantum correlations present in many-body quantum systems. It is shown that the amo
Externí odkaz:
http://arxiv.org/abs/0809.1723
Autor:
Dillenschneider, Raoul
Publikováno v:
Phys. Rev. B 78, 115417 (2008)
Effects of a Kekule distortion on exciton instability in single-layer graphene are discussed. In the framework of quantum electrodynamics the mass of the electron generated dynamically is worked out using a Schwinger-Dyson equation. For homogeneous l
Externí odkaz:
http://arxiv.org/abs/0806.3349
Autor:
Dillenschneider, Raoul, Lutz, Eric
Publikováno v:
EPL 88 (2009) 50003.
We consider a photo--Carnot engine that consists of a single--mode radiation field in an optical cavity. One the heat reservoirs is made of a beam of thermally entangled pairs of two--level atoms that interact resonantly with the cavity. We express t
Externí odkaz:
http://arxiv.org/abs/0803.4067
Autor:
Dillenschneider, Raoul, Han, Jung Hoon
Publikováno v:
Phys. Rev. B 78, 045401 (2008)
Exciton instability in graphene bilayer systems is studied in the case of a short-ranged Coulomb interaction and a finite voltage difference between the layers. Self-consistent exciton gap equations are derived and solved numerically and analytically
Externí odkaz:
http://arxiv.org/abs/0709.1230
Publikováno v:
Journal of the Korean Physical Society 53, 732 (2008)
A class of exact spin ground states with nonzero averages of vector spin chirality, $<\v{S}_i \times \v{S}_j \cdot \hat{z}>$, is presented. It is obtained by applying non-uniform O(2) rotations of spin operators in the XY plane on the SU(2)-invariant
Externí odkaz:
http://arxiv.org/abs/0705.3993