Magnetically induced reconstruction of the ground state in a few-electron Si quantum dot - art. no. 166802

We report unexpected fluctuations in the positions of Coulomb blockade peak s at high magnetic fields in a small Si quantum dot. The fluctuations have a distinctive sawtooth pattern: as a function of magnetic field, linear shi fts of peak positions are compensated by abrupt jumps in the opposite direc tion. The linear shifts have large slopes, suggesting formation of the grou nd state with a nonzero angular momentum. The value of the momentum is foun d to be well defined, despite the absence of the rotational symmetry in the dot.