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Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 39: Superconductivity: (General) Theory

TT 39.6: Talk

Wednesday, March 22, 2017, 10:45–11:00, HSZ 103

f-wave triplet superconductivity in a twisted triangular Hubbard tube as a model of A2Cr3As3Sahinur Reja1 and •Satoshi Nishimoto2,31Indiana University, Bloomington, USA — 2TU Dresden, Germany — 3IFW Dresden, Germany

Triplet superconductivity (SC) recently has been one of the active research topics partly due to its intrinsic connection to quantum computations. In this contex, we study the ground state properties of a twisted triangular Hubbard tube using the perturbation theory and density-matrix renormalization group method. We show that two electrons in an odd-site Hubbard ring always form a spin-triplet pair, and subsequently a polarized ferromagnetic (FM) order is stabilized in a wide range of electron filling (n) when these rings are weakly coupled. By calculating the binding energy and spin gap, we confirm the presence of the spin-triplet SC after melting of the FM order with increasing the inter-triangle couplings (t2). We show that triplet SC pair correlations are consistent with the f-wave channel. We present a detailed n-t2 phase diagram which features also singlet SC at n ∼ 1 and t2 ∼ 1. Finally we argue that this model has possible relevance to the f-wave SC observed in alkali chromium arsenides A2Cr3As3 (A=K,Rb,Cs).

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