Statistical properties of two-particle transmission at Anderson transition

The ensemble of $L\times L$ power-law random banded matrices, where the random hopping $H_{i,j}$ decays as a power-law $(b\mathrm{/}\mathrm{\mid }i-j\mathrm{\mid }{)}^a$, is known to present an Anderson localization transition at $a=1$, where one-particle eigenfunctions are multifractal. Here we study numerically, at this critical point, the statistical properties of the transmission $T_2$ for two distinguishable particles, two bosons or two fermions. We find that the statistics of $T_2$ is multifractal, i.e. the probability to have $T_2(L) \sim 1/L^{\kappa}$behavesas$L^{\Phi_2(\kappa)}$,wherethemultifractalspectrum$\Phi_2(\kappa)$ for fermions is different from the common multifractal spectrum concerning distinguishable particles and bosons. However in the three cases, the typical transmission $T_2^{typ}(L)$ is governed by the same exponent ${\kappa }_2^{typ}$, which is much smaller than the naive expectation $2{\kappa }_1^{typ}$, where ${\kappa }_1^{typ}$ is the typical exponent of the one-particle transmission $T_1(L)$.