Vibration-mediated Kondo transport in molecular junctions: conductance evolution during mechanical stretching

• David Rakhmilevitch and
• Oren Tal

Beilstein J. Nanotechnol. 2015, 6, 2417–2422, doi:10.3762/bjnano.6.249

• activation can be distinguished. This analysis sheds light on the different parameters that affect vibration-mediated Kondo transport. As a starting point we briefly mention the relevant information found by former analysis of the Ag/CuPc molecular junction [23]. Differential conductance measurements

• differential conductance measurements as a function of voltage that revealed either Kondo peaks at zero and finite bias (Figure 1a) or vibration-induced conductance steps at the same voltage of the side peaks [23] (Figure 1a, inset) in about 30% of junctions, with a total of 186 junctions exhibiting a Kondo

• peak accompanied by satellite peaks and 31 junctions exhibiting a vibration-induced conductance step. These peaks and steps were not observed for the bare Ag junctions. We focus on the evolution of differential conductance curves while gradually increasing the inter-electrode separation in increments

Negative differential electrical resistance of a rotational organic nanomotor

• Hatef Sadeghi,
• Sara Sangtarash,
• Qusiy Al-Galiby,
• Rachel Sparks,
• Steven Bailey and
• Colin J. Lambert

Beilstein J. Nanotechnol. 2015, 6, 2332–2337, doi:10.3762/bjnano.6.240

• temperature for applied biases between −1 and 1 V. By differentiating the current with respect to the bias voltage V, one obtains the differential conductance (Figure 4, green dashed line) of the device, which clearly shows regions of NDR behaviour arising from the change in the energy landscape. The higher

Enhanced fullerene–Au(111) coupling in (2√3 × 2√3)R30° superstructures with intermolecular interactions

• Michael Paßens,
• Rainer Waser and
• Silvia Karthäuser

Beilstein J. Nanotechnol. 2015, 6, 1421–1431, doi:10.3762/bjnano.6.147

• addition, hybrid fullerene–Au(111) surface states suggest partly covalent interactions. Keywords: adatom–vacancy mechanism; differential conductance; fullerene; Ising model; scanning tunnelling microscopy; Introduction Monolayers of close-packed fullerenes on metal surfaces belong to one of the most

• adatoms. The observed symmetry breaking causes the lifting of the degeneracy of the LUMO and LUMO+1 orbitals in the differential conductance spectra. In addition, hybrid fullerene–metal states are identified and attributed to partly covalent interactions between adatoms on the Au(111) surface and C60

• C60 adsorbed with the 6:6 C–C bond and slightly tilted (Ubias = 0.80 V, IT = 0.41 nA, sample B). All structures point to an intermolecular effect that explains the long range order in the u-R30° superstructure. (a) Differential conductance spectra (dI/dV) over a C60 molecule as indicated by the red

Spectroscopic mapping and selective electronic tuning of molecular orbitals in phosphorescent organometallic complexes – a new strategy for OLED materials

• Pascal R. Ewen,
• Jan Sanning,
• Tobias Koch,
• Nikos L. Doltsinis,
• Cristian A. Strassert and
• Daniel Wegner

Beilstein J. Nanotechnol. 2014, 5, 2248–2258, doi:10.3762/bjnano.5.234

• transferred in situ into the cold STM (T = 5 K). All images where taken in constant-current mode. For the tunneling spectra the current I and the differential conductance dI/dV (via lock-in technique, modulation voltage 10–20 mV) were measured simultaneously as a function of sample bias V under open-feedback

Charge and spin transport in mesoscopic superconductors

• M. J. Wolf,
• F. Hübler,
• S. Kolenda and
• D. Beckmann

Beilstein J. Nanotechnol. 2014, 5, 180–185, doi:10.3762/bjnano.5.18

• current Iinj flowing into the junction is measured to determine the local differential conductance gloc = dIinj/dVinj. Simultaneously, the current Idet flowing out of a nearby detector junction is measured to obtain the nonlocal conductance gnl = dIdet/dVinj. The nonlocal conductance was measured for

Charge transport in a zinc–porphyrin single-molecule junction

• Mickael L. Perrin,
• Christian A. Martin,
• Ferry Prins,
• Ahson J. Shaikh,
• Rienk Eelkema,
• Jan H. van Esch,
• Jan M. van Ruitenbeek,
• Herre S. J. van der Zant and
• Diana Dulić

Beilstein J. Nanotechnol. 2011, 2, 714–719, doi:10.3762/bjnano.2.77

• reduction of the noise. The I(V)s of the junction containing ZnTPPdT–Pyr now show sharp step-like features, which are more pronounced than those in Figure 2d. We numerically determined the differential conductance (dI/dV) as displayed in Figure 3c. In the dI/dV curves, the steplike features are visible as

Interaction of spin and vibrations in transport through single-molecule magnets

• Falk May,
• Maarten R. Wegewijs and
• Walter Hofstetter

Beilstein J. Nanotechnol. 2011, 2, 693–698, doi:10.3762/bjnano.2.75

• zero-temperature differential conductance [19], as a function of the bias voltage V, were obtained from the SMM spectral function A(ω). Here ΓL,R is the tunnel coupling of the SMM to the left and right electrode. We calculated using the numerical renormalization group (NRG) from the equilibrium

• differential conductance. Due to the presence of the electrodes, spin fluctuations thus become significant at low temperature despite the presence of the anisotropy barrier of size DS2 opposing SMM spin reversal. A hallmark of this QST-Kondo effect is that it is suppressed with decreasing ratio of E/D or

• conductance G(V) normalized to the value and for T = 0. Parameters are S = 3/2, D = 5 · 10−4W, E = 0.1D, E′ = 0, Ω = 0.5D, J = 0.2W and D′ is varied. The dashed line represents the renormalized ZFS from Equation 3. Effect of the spin–vibration coupling on the QST-Kondo peak: SMM differential conductance