Phys. Rev. B 90, 115110 (2014); http://dx.doi.org/10.1103/PhysRevB.90.115110
arXiv:1304.8090 [quant-ph]
The existence of vacuum forces is one of the most striking consequences of quantum mechanics. We show how the strong potentials induced by vacuum fluctuations can be exploited in a practical scheme for quantum sensing. Position measurements at the quantum level are of central importance for many applications but very challenging.
Phys. Rev. Lett. 107, 107201
We extend the Mermin-Wagner theorem to a system of lattice spins which are spin coupled to itinerant and interacting charge carriers. We use the Bogoliubov inequality to rigorously prove that neither (anti-) ferromagnetic nor helical long-range order is possible in one and two dimensions at any finite temperature. Our proof applies to a wide class of models including any form of electron-electron and single-electron interactions that are independent of spin.
Phys. Rev. B 84, 075307 (2011).
The physics of quantum dots is depicted succinctly by the universal Hamiltonian, where only zero-mode interactions are included. In the case in which the latter involve charging and isotropic spin-exchange terms, this would lead to a non-Abelian action. Here we address an Ising spin-exchange interaction, which leads to an Abelian action. The analysis of this simplified yet nontrivial model shed light on a more general case of charge and spin entanglement. We present a calculation of the tunneling density of states and dynamic magnetic susceptibility.