We use self-consistent quantum transport theory to investigate the influence of electron-electron interactions on interlayer transport in semiconductor electron bilayers in the absence of an external magnetic field. We conclude that, even though spontaneous pseudospin order does not occur at zero field, interaction-enhanced quasiparticle tunneling amplitudes and pseudospin transfer torques do a...

We report single-molecule-transistor measurements on devices incorporating magnetic molecules. By studying the electron-tunneling spectrum as a function of magnetic field, we are able to identify signatures of magnetic states and their associated magnetic anisotropy. A comparison of the data to simulations also suggests that sequential electron tunneling may enhance the magnetic relaxation of t...

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...

An important issue regarding DNA electrical conductivity is the electron (hole) transfer rate. Experiments have found that this transfer rate involves quantum mechanical tunneling for short distances and thermally activated hopping over large distances. The electron (or hole) tunneling probability through a molecule depends on the length of molecule L, as e(-beta(E)L), where the tunneling betaE...

We investigate tunneling through a short wire with electron-electron interactions which is coupled to noninteracting leads. We identify two temperature regimes (a) TKondo < T ≤ Twire = h̄vF /kBd (d is the length of the interacting wire) and (b) T < TKondo ≪ Twire. In the first regime the effective (renormalized) electron-electron interaction is smaller than the tunneling matrix element. In this ...

Electron tunneling experiments involving Hg-Hg junctions incorporating two alkanethiolate monolayers are described. Formation of a symmetric junction (Hg-SCn-CnS-Hg) is accomplished by bringing in contact two small (3 × 10-3 cm2) mercury drop electrodes in a 5-20% (v/v) hexadecane solution of an alkanethiol. Formation of asymmetric junctions (Hg-SCn-CmS-Hg) and junctions containing n-alkane-3th...

Tunneling field effect transistors (TFETs) have been proposed to overcome the fundamental issues of Si based transistors, such as short channel effect, finite leakage current, and high contact resistance. Unfortunately, most if not all TFETs are operational only at cryogenic temperatures. Here we report that iron (Fe) quantum dots functionalized boron nitride nanotubes (QDs-BNNTs) can be used a...

Long-range electronic interactions between electron donors and acceptors in proteins depend on the structure of the intervening polypeptide. Several methods have been developed for calculating these weak couplings. New challenges in protein electron-transfer research include identifying the role of protein dynamics, and characterizing multistep tunneling over very long distances.

We have measured the tunneling between two two-dimensional electron gases at high magnetic fields B, when the carrier densities of the two electron layers are matched. For filling factors ν < 1, there is a gap in the current-voltage characteristics centered about V = 0, followed by a tunneling peak at ∼ 6 mV. Both features have been observed before and have been attributed to electron-electron ...

Marcus theory has explained how thermal nuclear motions modulate the energy gap between donor and acceptor sites in protein electron transfer reactions. Thermal motions, however, may also modulate electron tunneling between these reactions. Here we identify a new mechanism of nuclear dynamics amplification that plays a central role when interference among the dominant tunneling pathway tubes is...