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SYQD: Quantum decoherence in solid state physics

SYQD 1: Quantum Decoherence in Solid State Physics I

SYQD 1.5: Hauptvortrag

Dienstag, 25. März 2003, 16:00–16:30, HSZ/01

Phase Coherence in Mesoscopic Kondo Wires — •Christopher Bäuerle, F. Schopfer, W. Rabaud , and L. Saminadayar — CRTBT-CNRS, BP166, 38042 Grenoble Cedex 9, France

The understanding of quantum coherence in metallic systems is one of the most important challenges in mesoscopic physics. Such a very fundamental problem addresses the "historic" question of the ground state of an electron gas at zero temperature and is also relevant to the recent question of the possible realization of quantum computers. Since the publication of the experimental results of Mohanty et al. [1] there has been a heavy debate on whether the phase coherence time at zero temperature should diverge or not. One important source of decoherence at low temperatures are magnetic impurities. However, their influence on the phase coherence time is rather poorly understood.

In this talk, we will present measurements on the magneto resistance and resistivity of quasi one-dimensional (1D) long and narrow Au/Fe Kondo wires down to temperatures of 15 mK. We will discuss the influence of magnetic impurities on the phase coherence time and show that interactions between magnetic impurities lead to a temperature independent spin scattering rate at very low temperatures [2].

[1] P. Mohanthy, E.M.Q Jariwala and R.A. Webb, Phys. Rev. Lett. 78, 3366 (1997).

[2] F. Schopfer, C. Bauerle, W. Rabaud and L. Saminadayar, to appear in Phys. Rev. Lett.