Hamburg 2001 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 22: Quantenphasenüberg
änge

TT 22.4: Vortrag

Donnerstag, 29. März 2001, 12:30–12:45, J

Tunneling-Driven Quantum Phase Transitions in Mesoscopic Commensurate Systems of Strongly Correlated Electrons — •Ioan Baldea^1,2, Horst Köppel², and Lorenz S. Cederbaum² — ¹Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe — ²Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, INF 229, 69120 Heidelberg

We present an example demonstrating that CDW-to-CDW and SDW-to-SDW quantum phase transitions driven by tunneling between states characterized by charge and spin density waves of different symmetries can occur in finite commensurate systems of strongly correlated electrons. These transitions could be studied experimentally e.g. by optical absorption in mesoscopic systems.