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    Linear Continuum Mechanics for Quantum Many-Body Systems

    Tao, Jianmin
    Gao, Xianlong
    Vignale, Giovanni, 1957-
    Tokatly, I. V.
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    [PDF] LinearContinuumMechanicsQuantum.pdf (154.6Kb)
    Date
    2009
    Format
    Article
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    Abstract
    We develop the continuum mechanics of quantum many-body systems in the linear response regime. The basic variable of the theory is the displacement field, for which we derive a closed equation of motion under the assumption that the time-dependent wave function in a locally comoving reference frame can be described as a geometric deformation of the ground-state wave function. We show that this equation of motion is exact for systems consisting of a single particle, and for all systems at sufficiently high frequency, and that it leads to an excitation spectrum that has the correct integrated strength. The theory is illustrated by simple model applications to one- and two-electron systems.
    URI
    http://hdl.handle.net/10355/7640
    Citation
    Phys. Rev. Lett. 103, 086401 (2009)
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