Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 46: Atomic collisions and ultracold plasmas
A 46.6: Vortrag
Donnerstag, 20. März 2014, 17:45–18:00, BEBEL E34
Quantum phases of quadrupolar Fermi gases on a quasi one-dimensional system — •Wen-Min Huang1,2, Martin Lahrz1, and Ludwig Mathey1,2 — 1Center for Optical Quantum Technologies and Institute for Laser Physics University of Hamburg, 22761 Hamburg, Germany — 2Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, Hamburg 22761, Germany
In this work, we study quantum phases diagrams of polar fermions with a pure interquadrapolar interaction on two one-dimensional tubes. In the framework of Tomonaga-Luttinger-liquid theory, we map out the phases diagrams with reasonable experimental parameters versus the distance of two tubes and the angle between the direction of the tubes and quadrupolar moments. The latter can be controlled by an external field in experiments. We show that there are two magic angles from 0 to π/2, where intratube quadrupolar interactions vanish and change signs. Between two magic angles, a two gapless Tomonaga-Luttinger liquids exhibit under a dominated intratube attraction. By further computing various correlation functions, we show that a polarized triplet superfluid and a planer (pseudo-)spin-density wave compete each other. Outside of the regime, both intratube and intertube interactions are repulsive. Under the renormalization-group transformation in weak couplings, a flow to strong coupling of the backward scattering between two tubes lead to a pseudo-spin-gapped state with an axial-(pseudo-)spin-density-wave correlation in low-energy limit.