  A key concept in the field of semiconductor spintronics is an electric field
control of spins via the spin-orbit coupling (SOC) and the SOC strength governs
efficiency of this control. We propose a new approach that allows the
experimental determination of the Rashba SOC strength for ballistic InAs
nanowires. The energy spectrum and ballistic transport of carriers through the
nanowire with surface two-dimensional electron gas (2DEG) in a homogeneous
magnetic field are studied. A general formula for the linear-response
one-dimensional ballistic thermopower is derived in the case of complex subband
structure. The ballistic conductance and the thermopower are shown to reveal
specific features due to strong SOC that allows us to propose a method for the
SOC strength determination.
