– The Coulomb correlation of a remote electron separated from a two-dimensional electron system (2DES) is studied in the presence of a magnetic field applied perpendicular to the 2DES. The polarization produced by the remote electron is described as the excitation of virtual plasmons in the 2DES. The resulting composite quasi-particle, electron + polarization, is therefore called a plasmon pola...

We calculate the tunneling density of states (DOS) of MgB2 for different tunneling directions, by directly solving the real-axis, two-band Eliashberg equations (EE). Then we show that the numeric inversion of the standard singleband EE, if applied to the DOS of the two-band superconductor MgB2, may lead to wrong estimates of the strength of certain phonon branches (e.g. the E2g) in the extracte...

Scanning tunneling images of carbon nanotubes frequently show electron distributions that break the local sixfold symmetry of the graphene sheet. We present a theory of these images that relates these anisotropies to the off-diagonal correlations in the single-particle density matrix, and allows one to extract these correlations from the observed images. The theory is applied to images of the l...

We investigated the reaction mechanism of the desorption of single hydrogen from a titanium dioxide surface excited by the tip of a scanning tunneling microscope (STM). Analysis of the desorption yield, in combination with theoretical calculations, indicates the crucial role played by the applied electric field. Instead of facilitating desorption by reducing the barrier height, the applied elec...

We investigated the inner-sphere reorganization of ferrocene ((Cp) 2Fe ( n+ )) and tris(2,2'-bipyridine) iron ((bpy) 3Fe ( n+ )) in a single-molecule-transistor geometry. In (Cp) 2Fe ( n+ ) ( n = 0 and 1), almost no vibrations were excited during single-electron transport, whereas in (bpy) 3Fe ( n+ ) ( n = 1, 2, and 3), many distinct vibrations appeared, consistent with its larger reorganizatio...

We formulate the problem of electron transport through a single-molecule magnet (SMM) in the Coulomb blockade regime taking into account topological interference effects for the tunneling of the large spin of a SMM. The interference originates from spin Berry phases associated with different tunneling paths. We show that, in the case of incoherent spin states, it is essential to place the SMM b...

Tunneling electrons from a low-temperature (5 kelvin) scanning tunneling microscope were used to control, through resonant electronic excitation, the molecular dynamics of an individual biphenyl molecule adsorbed on a silicon(100) surface. Different reversible molecular movements were selectively activated by tuning the electron energy and by selecting precise locations for the excitation insid...

Variable-area resonant tunneling diodes have been fabricated using a process in which the lateral confinement is produced by an in-plane implanted gate. The basic operation of such devices is discussed, and the lateral confinement shown by both measurements and numerical modeling to be very nearly symmetrical about the resonant tunneling diode (RID) barriers. Fine structure has been observed ne...

Electron tunneling in ferromagnetic single-electron transistors is considered theoretically in the sequential tunneling regime. A new formalism is developed, which operates in a two-dimensional space of states, instead of one-dimensional space used in the spinless case. It is shown that spin fluctuations can be significantly larger than the charge fluctuations. The influence of discrete energy ...