Finite-temperature Fermi-edge singularity in tunneling studied using random telegraph signals

Details Finite-temperature Fermi-edge singularity in tunneling studied using random telegraph signals Finite-temperature Fermi-edge singularity in tunneling studied using random telegraph signals

1996-05-03

arxiv.org/abs/cond-mat/9605020v1

Phys. Rev. Lett. 75 (1995) 4274-4277

Physics

Condensed Matter

5 pages, REVTEX, 3 postscript figures included with epsfig

Scientific paper

10.1103/PhysRevLett.75.4274

We show that random telegraph signals in metal-oxide-silicon transistors at millikelvin temperatures provide a powerful means of investigating tunneling between a two-dimensional electron gas and a single defect state. The tunneling rate shows a peak when the defect level lines up with the Fermi energy, in excellent agreement with theory of the Fermi-edge singularity at finite temperature. This theory also indicates that defect levels are the origin of the dissipative two-state systems observed previously in similar devices.

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