نتایج جستجو برای: adiabatic

تعداد نتایج: 12801  

Journal: :Physical review letters 2014
O L Acevedo L Quiroga F J Rodríguez N F Johnson

We reveal universal dynamical scaling behavior across adiabatic quantum phase transitions in networks ranging from traditional spatial systems (Ising model) to fully connected ones (Dicke and Lipkin-Meshkov-Glick models). Our findings, which lie beyond traditional critical exponent analysis and adiabatic perturbation approximations, are applicable even where excitations have not yet stabilized ...

2003
Danhong Huang

A previous theory for studying the distribution of non-uniform fields in multiple-quantum-well photodetectors under an ac voltage is generalized by including non-adiabatic space-charge-field effects. Numerical calculations indicate that field-domain effects are only important at high temperatures or high voltages when both injection and sequentialtunneling currents are significant. On the other...

Journal: :Nature communications 2016
K S Kumar A Vepsäläinen S Danilin G S Paraoanu

The adiabatic manipulation of quantum states is a powerful technique that opened up new directions in quantum engineering--enabling tests of fundamental concepts such as geometrical phases and topological transitions, and holding the promise of alternative models of quantum computation. Here we benchmark the stimulated Raman adiabatic passage for circuit quantum electrodynamics by employing the...

2000
Hanna Pawlowska Frederic Burnet

Data collected in situ with the Meteo-France Merlin-IV instrumented aircraft during the EUCREX mission 206 are analyzed to document cloud properties that are relevant to the calculation of cloud radiative properties. Ascents and descents through the cloud layer reveal that Ž . most of the vertical profiles of liquid water content LWC and droplet sizes are close to adiabatic profiles. Analysis o...

2004
D. Soudris V. Pavlidis A. Thanailakis

The novel design of various adiabatic adders based on pass transistor logic is introduced. Also, a new I-bit full adder basic cell with a small number of transistors is designed. The architectural design of each adiabatic adder and new formulas for their corresponding delay, are presented. The performance of various adiabatic adders, in this work, against the performance of theirs CMOS counterp...

2006
Kazuo Fujikawa

The conventional formulation of the non-adiabatic (Aharonov-Anandan) phase is based on the equivalence class {eα(t)ψ(t, ~x)}. This equivalence class when understood as defining generalized rays in the Hilbert space is not generally consistent with the superposition principle in interference and polarization phenomena. The hidden local gauge symmetry, which arises from the arbitrariness of the c...

1997
Alexei V. Sergeev David Z. Goodson

A recently developed perturbation theory for solving self-consistent-eld equations is applied to the hydrogen atom in a strong magnetic eld. This system has been extensively studied using other methods and is therefore a good test case for the new method. The perturbation theory yields summable large-order expansions. The accuracy of the self-consistent-eld approximation varies according to eld...

2008
Steven Weinberg

Even if non-adiabatic perturbations are generated in multi-field inflation, the perturbations will become adiabatic if the universe after inflation enters an era of local thermal equilibrium, with no non-zero conserved quantities, and will remain adiabatic as long as the wavelength is outside the horizon, even when local thermal equilibrium no longer applies. Small initial non-adiabatic perturb...

2012
C. Chen

The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Self-consistent particle-in-cell simulations are performed to verify earlier theoretical predictions of adiabatic thermal beams in a periodic solenoidal magnetic focusing field [K. In particular, results are obtained for adiabatic thermal beams that do not rotate in the Larmor ...

2008
Karim A. Malik David Wands

We present a gauge-invariant formalism to study the evolution of curvature perturbations in a Friedmann-Robertson-Walker universe filled by multiple interacting fluids. We resolve arbitrary perturbations into adiabatic and entropy components and derive their coupled evolution equations. We demonstrate that perturbations obeying a generalised adiabatic condition remain adiabatic in the large-sca...

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