Nuclear collective tunneling between Hartree states

Distinction of nuclear spin states with the scanning tunneling microscope.

We demonstrate rotational excitation spectroscopy with the scanning tunneling microscope for physisorbed H(2) and its isotopes HD and D(2). The observed excitation energies are very close to the gas phase values and show the expected scaling with the moment of inertia. Since these energies are characteristic for the molecular nuclear spin states we are able to identify the para and ortho specie...

Universality of symmetry and mixed-symmetry collective nuclear states.

The global correlation in the observed variation with mass number of the E2 and summed M1 transition strengths is examined for rare earth nuclei. It is shown that a theory of correlated S and D fermion pairs with a simple pairing plus quadrupole interaction leads naturally to this universality. Thus a unified and quantitative description emerges for low-lying quadrupole and dipole strengths.

Tunneling between edge states in a quantum spin Hall system.

We analyze a quantum spin Hall device with a point contact connecting two of its edges. The contact supports a net spin tunneling current that can be probed experimentally via a two-terminal resistance measurement. We find that the low-bias tunneling current and the differential conductance exhibit scaling with voltage and temperature that depend nonlinearly on the strength of the electron-elec...

1 99 3 Resonant Tunneling Between Quantum Hall Edge States

Resonant tunneling between fractional quantum Hall edge states is studied in the Luttinger liquid picture. For the Laughlin parent states, the resonance line shape is a universal function whose width scales to zero at zero temperature. Extensive quantum Monte Carlo simulations are presented for ν = 1/3 which confirm this picture and provide a parameter-free prediction for the line shape.

Instantons describing tunneling between magnetic states at finite temperature