Existence of A Rigorous Density-Functional Theory for Open Electronic Systems

Details Existence of A Rigorous Density-Functional Theory for Open Electronic Systems Existence of A Rigorous Density-Functional Theory for Open Electronic Systems

2006-05-11

arxiv.org/abs/quant-ph/0605104v1

Physics

Quantum Physics

5 pages, 1 figure

Scientific paper

We prove that the electron density function of a real physical system can be uniquely determined by its values on any finite subsystem. This establishes the existence of a rigorous density-functional theory for any open electronic system. By introducing a new density functional for dissipative interactions between the reduced system and its environment, we subsequently develop a time-dependent density-functional theory which depends in principle only on the electron density of the reduced system.

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