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We observed the high-mass star-forming core G336.01-0.82 at 1.3 mm and 0.05''(~150 au) angular resolution with the Atacama Large Millimeter/submillimeterArray (ALMA) as part of the Digging into the Interior of Hot Cores with ALMA(DIHCA) survey. These high-resolution observations reveal two spiral streamersfeeding a circumstellar disk at opposite sides in great detail. Molecular lineemission from CH$_3$OH shows velocity gradients along the streamers consistentwith infall. Similarly, a flattened envelope model with rotation and infallimplies a mass larger than 10 M$_\odot$ for the central source and acentrifugal barrier of 300 au. The location of the centrifugal barrier isconsistent with local peaks in the continuum emission. We argue that gasbrought by the spiral streamers is accumulating at the centrifugal barrier,which can result in future accretion burst events. A total high infall rate of~$4\times10^{-4}$ M$_\odot$ yr$^{-1}$ is derived by matching models to theobserved velocity gradient along the streamers. Their contribution account for20-50% the global infall rate of the core, indicating streamers play animportant role in the formation of high-mass stars.

Digging into the Interior of Hot Cores with ALMA: Spiral Accretion into the High-mass Protostellar Core G336.01-0.82