Infrared catastrophe and tunneling into strongly correlated electron systems: Perturbative x-ray edge limit

Abstract

The tunneling density of states exhibits anomalies (cusps, algebraic suppressions, and pseudogaps) at the Fermi energy in a wide variety of low-dimensional and strongly correlated electron systems. We argue that in many cases these spectral anomalies are caused by an infrared catastrophe in the screening response to the sudden introduction of a new electron into the system during a tunneling event. A nonperturbative functional-integral method is introduced to account for this effect, making use of methods developed for the x-ray edge singularity problem. The formalism is applicable to lattice or continuum models of any dimensionality, with or without translational invariance. An approximate version of the technique is applied to the 1D electron gas and the 2D Hall fluid, yielding qualitatively correct results.

arXiv comment6 pages

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Cited by in corpus (4)

• X-ray edge problem of graphene
• Infrared catastrophe and tunneling into strongly correlated electron systems: Beyond the x-ray edge limit
• Infrared catastrophe and tunneling into strongly correlated electron systems: Exact solution of the x-ray edge limit for the 1D electron gas and 2D Hall fluid
• Tunneling into a Fractional Quantum Hall System and the Infrared Catastrophe