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Comment on "Response calculations with an independent particle system with an exact one-particle density matrix''
calculations independent particle system one-particle density matrix
2010/11/16
We point out an error in the argument [PRL 105, 013002 (2010)] that the time independence of the occupation numbers in the adiabatic approximation follows from the invariance of the ground-state inter...
Symmetry breaking orbital anisotropy on detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
Symmetry breaking orbital anisotropy detwinned Ba
2010/11/17
Nematicity, defined as broken rotational symmetry, has recently been observed in the competing phases in proximity to the superconducting phase in the high TC cuprates (1-2). Similarly, the new iron-b...
Interface Trap Density Metrology of state-of-the-art undoped Si n-FinFETs
Interface Trap Density Metrology state-of-the-art undoped Si n-FinFETs
2010/11/22
The presence of interface states at the MOS interface is a well-known cause of device gradation.This is particularly true for ultra-scaled FinFET geometries where the presence of a few traps can stron...
Source Mechanism of Long Period events recorded by a high density seismic network during the 2008 eruption on Mt Etna
Source Mechanism high density seismic network the 2008 eruption on Mt Etna
2010/11/16
129 Long Period (LP) events, divided into two families of similar events, were recorded by the 50 stations deployed on Mount Etna in the second half of June 2008. During this period lava was flowing ...
Optical and Hall conductivities of a thermally disordered two-dimensional spin-density wave: two-particle response in the pseudogap regime of electron-doped high-$T_c$ superconductors
Dual-Fer Optical Hall conductivities thermally disordered two-dimensional spin-density wave
2010/11/23
We calculate the longitudinal (σxx) and Hall (σxy) optical conductivities for two-dimensional
metals with thermally disordered antiferromagnetism using a generalization of an approximation
introduce...
Electron star birth: A continuous phase transition at nonzero density
Electron star continuous phase transition nonzero density
2010/12/22
We show that charged black holes in Anti-de Sitter spacetime can undergo a third
order phase transition at a critical temperature in the presence of charged fermions. In
the low temperature phase, a...
We analyze the problem of calculating the solutions and the spectrum of a string with arbitrary density and fixed ends. We build a perturbative scheme which uses a basis of WKB-type functions and obt...
Coupled-channels density-matrix approach to low-energy nuclear collision dynamics: A technique for quantifying quantum decoherence effects on reaction observables
Coupled-channels density-matrix low-energy nuclear collision dynamics reaction observables
2010/11/11
The coupled-channels density-matrix technique for nuclear reaction dynamics, which is based on the Liouville-von Neumann equation with Lindblad dissipative terms, is developed with the inclusion of fu...
We study various methods to generate ensembles of quantum density matrices of a fixed size N and analyze the corresponding probability distributions P(x), where x denotes the rescaled eigenvalue, x=N\...
Limit distribution with a combination of density functions for a 2-state quantum walk
Limit distribution Time-inhomogeneous 2-state quantum walk
2010/11/5
We consider 2-state time-inhomogeneous quantum walks defined by two matrices on the line. For the time-homogeneous walks determined by a unitary matrix, the limit distribution is expressed by a simple...
Computational Difficulty of Computing the Density of States
Computational Computing the Density of States
2010/11/5
We study the computational difficulty of computing the ground state degeneracy and the density of states for local Hamiltonians. We show that the difficulty of both problems is exactly captured by a c...
Detecting entanglement of states by entries of their density matrices
Detecting entanglement states by entries their density matrices
2010/11/4
For any bipartite systems, a universal entanglement witness of rank-4 for pure states is obtained and a class of finite rank entanglement witnesses is constructed. In addition, a method of detecting e...
Numerical Feynman integrals for density operator dynamics using more than one mesh: faster convergence and significant reduction of computational cost
Feynman integral path integral QUAPI Feynman-Vernon
2010/10/26
The Feynman integral is one of the most accurate methods for calculating density operator dy-
namics in open quantum systems. However, the number of time steps that can realistically be used is alway...
Information geometry of density matrices and state estimation
Information geometry density matrices state estimation
2010/10/18
Given a pure state vector |xi and a density matrix ˆρ, the function p(x|ˆρ) = hx|ˆρ|xi defines a probability density on the space of pure states parameterised by density matrices. The a...
On the relationship between parametric two-electron reduced-density-matrix methods and the coupled electron pair approximation
parametric two-electron reduced-density-matrix methods coupled electron pair approximation
2010/10/21
Parametric two-electron reduced-density-matrix (p-2RDM) methods have enjoyed much success
in recent years; the methods have been shown to exhibit accuracies greater than coupled cluster
with single ...