Publications [#316822] of Harold U. Baranger

Papers Published
  1. Baranger, HU; Ullmo, D; Glazman, LI, Interactions and interference in quantum dots: Kinks in Coulomb-blockade peak positions, Physical Review. B, Condensed Matter, vol. 61 no. 4 (2000), pp. R2425-R2428 .

    We investigate the spin of the ground state of a geometrically confined many-electron system. For atoms, shell structure simplifies this problem - the spin is prescribed by the well-known Hund's rule. In contrast, quantum dots provide a controllable setting for studying the interplay of quantum interference and electron-electron interactions in general cases. In a generic confining potential, the shell-structure argument suggests a singlet ground state for an even number of electrons. The interaction among the electrons produces, however, accidental occurrences of spin-triplet ground states, even for weak interaction, a limit which we analyze explicitly. Variation of an external parameter causes sudden switching between these states and hence a kink in the conductance. Experimental study of these kinks would yield the exchange energy for the "chaotic electron gas." ©2000 The American Physical Society.