Tunneling density of states in quantum dots with anisotropic exchange
Abstract
We reexamine the tunneling density of states in quantum dots and nanoparticles within the model which is an extension of the universal Hamiltonian to the case of uniaxial anisotropic exchange. We derive the exact analytical result for the tunneling density of states in the case of an arbitrary singleparticle energy spectrum. We find that, similar to the case of the isotropic exchange, the tunneling density of states as a function of energy has the maximum due to a finite value of the total spin of the ground state near the Stoner instability. We demonstrate that there are no additional extrema which have been predicted on the basis of perturbative analysis [M. N. Kiselev and Y. Gefen, Phys. Rev. Lett. 96, 066805 (2006)., 10.1103/PhysRevLett.96.066805].
 Publication:

Physical Review B
 Pub Date:
 July 2015
 DOI:
 10.1103/PhysRevB.92.035439
 arXiv:
 arXiv:1504.04753
 Bibcode:
 2015PhRvB..92c5439S
 Keywords:

 75.75.c;
 73.23.Hk;
 73.63.Kv;
 Coulomb blockade;
 singleelectron tunneling;
 Quantum dots;
 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 11 LaTex pages, 3 figures