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Publikováno v:
Nature Communications 5, 3497, 2014
When magnetic moments (spins) are regularly arranged in a geometry of a triangular motif, the spins may not satisfy simultaneously their interactions with their neighbors. This phenomenon, called frustration, leads to numerous energetically equivalen
Externí odkaz:
http://arxiv.org/abs/1309.7017
Autor:
Klich, I., Levitov, L. S.
Particle number conservation in fermionic systems restricts the allowed local operations on bi-partite systems. We show how this restriction is related to measurement entropy of particle fluctuations and compute it for several regimes of practical re
Externí odkaz:
http://arxiv.org/abs/0812.0006
Publikováno v:
Phys. Rev. Lett. 99, 205303 (2007)
We study the survival of super-currents in a system of impenetrable bosons subject to a quantum quench from its critical superfluid phase to an insulating phase. We show that the evolution of the current when the quench follows a Rosen-Zener profile
Externí odkaz:
http://arxiv.org/abs/0706.2869
Publikováno v:
Phys. Rev. Lett. 97, 116403 (2006)
A strategy is proposed to excite particles from a Fermi sea in a noise-free fashion by electromagnetic pulses with realistic parameters. We show that by using quantized pulses of simple form one can suppress the particle-hole pairs which are created
Externí odkaz:
http://arxiv.org/abs/cond-mat/0604017
Autor:
Klich, I.
Publikováno v:
"Quantum Noise in Mesoscopic Systems," ed. Yu V Nazarov (Kluwer, 2003)
We present a novel derivation of the original Levitov formula, for the statistics of charge transported between electron reservoirs. This is done by proving a trace formula, which relates certain traces in Fock space to single particle determinants.
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209642
Publikováno v:
Phys.Rev.Lett. 89 (2002) 033001
We discuss repulsive Casimir forces between dielectric materials with non trivial magnetic susceptibility. It is shown that considerations based on naive pair-wise summation of Van der Waals and Casimir Polder forces may not only give an incorrect es
Externí odkaz:
http://arxiv.org/abs/quant-ph/0202114
Publikováno v:
Phys.Rev. D65 (2002) 045005
We consider the Casimir energy of a thick dielectric-diamagnetic shell under a uniform velocity light condition, as a function of the radii and the permeabilities. We show that there is a range of parameters in which the stress on the outer shell is
Externí odkaz:
http://arxiv.org/abs/hep-th/0108053
Publikováno v:
Phys.Rev. D62 (2000) 045017
The Casimir energy, free energy and Casimir force are evaluated, at arbitrary finite temperature, for a dilute dielectric ball with uniform velocity of light inside the ball and in the surrounding medium. In particular, we investigate the classical l
Externí odkaz:
http://arxiv.org/abs/hep-th/0001019
Autor:
Klich, I.
Publikováno v:
Phys. Rev. D 61, 025004 (1999)
In this paper we sum over the spherical modes appearing in the expression for the Casimir energy of a conducting sphere and of a dielectric ball (assuming the same speed of light inside and outside), before doing the frequency integration. We derive
Externí odkaz:
http://arxiv.org/abs/hep-th/9908101