Hamburg 2001 – scientific programme

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HL: Halbleiterphysik

HL 44: Quantenpunkte und -dr
ähte: Transporteigenschaften II

HL 44.4: Talk

Friday, March 30, 2001, 12:15–12:30, S16

Magnetotunneling between two parallel quantum wires — •Michele Governale and Ulrich Zülicke — Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe

Motivated by experiment, we study a system of two parallel quantum wires that are coupled via homogeneous tunneling, i.e., canonical momentum is conserved in the tunneling process. As application of an in-plane magnetic field allows to tune canonical versus kinetic momentum, the IV-characteristics for magnetotunneling is a powerful probe to study spectral properties of electronic systems. We use bosonization and refermionization techniques to map the system of two coupled interacting quantum wires onto the simpler one of eight interacting Majorana fermions. In case interactions in the original system are chiral, i.e., right-movers interact with right-movers only etc., the resulting Hamiltonian is quadratic in the Majorana fermions and allows for exact calculation of transport properties. The latter is the minimal model exhibiting spin-charge separation, and we discuss the possibility to probe it using magnetotunneling.