  Radio-loud active galactic nuclei (RLAGNs) are a unique AGN population and
were thought to be preferentially associated with supermassive black holes
(SMBHs) at low accretion rates. They could impact the host galaxy evolution by
expelling cold gas through the jet-mode feedback. In this work, we studied
CO(6-5) line emission in a high-redshift radio galaxy, MRC 0152-209, at z=1.92
using ALMA up to a $0.024''$-resolution (corresponding to ~200 pc). This system
is a starburst major merger constituted of two galaxies: the northwest (NW) one
hosting the RLAGN with jet kinetic power $L_{\rm jet}\gtrsim2\times10^{46}$
erg/s and the southeast (SE) one. Based on the SED fitting for the entire
system (NW+SE galaxies), we found AGN bolometric luminosity $L_{\rm
AGN,bol}\sim(0.9-3)\times10^{46}$ erg/s for the RLAGN. We estimated BH mass
through $M_{\rm BH}-M_\star$ scaling relations and found an Eddington ratio of
$\sim0.7-4$ conservatively. These results suggest that the RLAGN is radiatively
efficient and the powerful jets could be launched from a super-Eddington
accretion disc. ALMA reveals a massive ($M_{\rm H_2}\sim2\times10^9$ Msun),
compact ($\sim500$ pc), and lopsided molecular outflow perpendicular to the jet
axis. The mass outflow rate (~1200-2600 Msun/yr) is comparable with the star
formation rate of ~2000-3000 Msun/yr. The outflow kinetic power/$L_{\rm
AGN,bol}$ ratio of ~0.008-0.02 and momentum boost factor ~3-24 agree with the
radiative-mode AGN feedback. On the other hand, the jets can also drive the
molecular outflow within its lifetime of $\sim2\times10^5$ yr without
additional energy supply from AGN radiation. The jets then could remove all
cold gas from the host galaxy through long-term, episodic launching. Our study
reveals a unique object where starburst, powerful jets, and rapid BH growth
co-exist, which may represent a fundamental stage of AGN-host galaxy
co-evolution.
