From the quantum group $U_{q^{1/2}}( {\widehat {\mathfrak{sl}}}_2 )$ to the Kronecker quantum cluster algebra

Abstract

Let $\mathcal A_q$ be the Kronecker quantum cluster algebra with principal coefficients. We construct an explicit algebra homomorphism from the whole quantum group ${U_{q^{1/2}}}( {\widehat {\mathfrak{sl}_2}} )$ to $\mathcal A_q$, whose images together with either of the two frozen variables generate $\mathcal A_q$. As an application, we obtain algebra homomorphisms from the split $\imath$quantum groups of affine $\widehat {\mathfrak{sl}}_2$ to $\mathcal A_q$. Moreover, we explicitly determine the images of the positive and negative real and imaginary root vectors of ${U_{q^{1/2}}}( {\widehat {\mathfrak{sl}_2}} )$ in terms of quantum cluster variables.