  We prove that the purely classical gravity dual of Fermi and non-Fermi
liquids exist by employing the logarithmic behavior of entanglement entropy to
probe Fermi surfaces. For isotropic systems, the logarithmic behavior
originates only from UV-IR intermediate regions of the minimal area surface.
For anisotropic systems, the surfaces' configuration becomes largely modified
by spatial anisotropy and series of solutions exist. By imposing the null
energy condition we show that the specific heat behaves as $C\propto T^\alpha$
where $\alpha\leq1$, in both systems. In the end, we also present an effective
gravity modle for anisotropic background.
