Properties of nanowires in air

Abellán, J.; Chicon, R.; Arenas, A.

doi:10.1016/s0039-6028(98)00707-9

Cited by 15 publications

(10 citation statements)

References 29 publications

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“…For high-bias, important questions concerning nonlinear conductance, 2,5-7 electromigration, 8 and heating arise. At the present stage, however, the available experimental results 2,5,8,9 on finite bias conduction in Au QPCs are contradictory, and the theoretical interpretation of the results is unclear. [5][6][7] Sakai and co-workers 8 studied conductance histograms acquired from breaking Au contacts in a relay and found that the 1 G 0 peak did not change its position as the bias voltage was gradually increased to 1.5 V. This suggests that the conductance of a single-atom Au contact ͑which has a conductance close to G 0 ) 3,4 is almost independent of voltage.…”

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confidence: 86%

“…2,5,9 We can fit the nonlinear curves to a tunneling model and suggest that these are due to tunneling through a contaminant layer between the electrodes. Previous measurements of I -V curves on Au contacts 2,5,9 were done over a time scale of 0.1-50 s, thus restricting the measurements to contacts which are stable over relatively long time scales. Instead, we use a setup, 10 whereby an I -V curve can be acquired within only 20 s, and transient contact geometries can be studied.…”

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confidence: 99%

“…8 In contrast, none of the previous measurements of highly nonlinear I -V curves on stable Au contacts at RT were performed on sputtered ͑and annealed͒ samples in UHV. 2,5,9 It has been suggested that the previously observed highly nonlinear I -V curves on Au contacts could be a signature of Luttinger-liquid effects. 2,5 Our results suggest an alternative and more trivial explanation, namely, that nonlinearities are related to a contamination of the Au-Au interface.…”

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confidence: 99%

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Current-voltage curves of gold quantum point contacts revisited

Hansen

Nielsen

Brandbyge

et al. 2000

Applied Physics Letters

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We present measurements of current–voltage (I–V) curves on gold quantum point contacts (QPCs) with a conductance up to 4 G0 (G0=2e2/h is the conductance quantum) and voltages up to 2 V. The QPCs are formed between the gold tip of a scanning tunneling microscope and a Au(110) surface under clean ultra-high-vacuum conditions at room temperature. The I–V curves are found to be almost linear in contrast to previous reports. Tight-binding calculations of I–V curves for one- and two-atom contacts are in excellent agreement with our measurements. On the other hand, clearly nonlinear I–V curves are only observed when the sample has been cleaned in air.

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confidence: 86%

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confidence: 99%

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confidence: 99%

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Current-voltage curves of gold quantum point contacts revisited

Hansen

Nielsen

Brandbyge

et al. 2000

Applied Physics Letters

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“…In the past literatures, both linear and nonlinear I-V curves have been reported on the Au 1G 0 contact. Cubic nonlinearity has been observed in experiments conducted in air or in low vacuum [29,30], while measurements in ultrahigh vacuum yield straight I-V curves [31,32]. To estimate the nonlinearity of each I(t) curve, we obtained the conductance…”

Section: B Nonlinearity In the I-v Characteristicsmentioning

confidence: 99%

Break Voltage of the 1G0 Contact of Noble Metals and Alloys

Miura

Iwata

Kurokawa

et al. 2009

e-J. Surf. Sci. Nanotechnol.

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We have measured the break voltage of the 1G0 contact of Au, Ag, Cu, and AuAg alloys at room temperature in ultrahigh vacuum. Exploiting the break junction technique, we produced a 1G0 contact and broke it by applying a voltage ramp. The break voltage of each metal exhibits a broad distribution, and the average break voltage decreases as Au > Cu & Ag, in consistent with the elemental dependence of the high-bias stability of the 1G0 contact suggested in previous experimental studies. In AuAg alloys, the break-voltage distribution for some alloys exhibits a double-peak structure, each peak locating close to the break voltage of the 1G0 contact of pure Au and Ag, respectively. This observation suggests that the break voltage of AuAg alloys is locally determined by the elemental species of the atom occupying the contact site.

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“…The resulting MQPCs need to be highly stable at room temperature. Contacts based on STM or MCBJs are reported to have only limited mechanical stability at room temperature, degrading in best cases, within tens of seconds. − Complimentary to this high-stability demand, the new fabrication route of MQPCs should also possess fault-correcting capabilities, i.e., to be able to “heal” damaged MQPCs when needed.…”

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confidence: 99%

Fabrication of Highly Stable Configurable Metal Quantum Point Contacts

2008

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Metal quantum point contacts (MQPCs), with dimensions comparable to the de Broglie wavelength of conducting electrons, reveal ballistic transport of electrons and quantized conductance in units of G0=2e(2)/h. While these contacts hold great promise for applications such as coherent controlled devices and atomic switches, their realization is mainly based on the scanning tunneling microscope (STM) and mechanically controlled break junction (MCBJ), which cannot be integrated into electronic circuits. MQPCs produced by these techniques have also limited stability at room temperature. Here we report on a new method to form MQPCs with quantized conductance values in the range of 1-4G0. The contacts appear to be stable at room temperature for hours and can be deterministically switched between conductance values, or reform in case they break, using voltage pulses. The method enables us to integrate MQPCs within nanoscale circuits to fully harness their unique advantages.

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Properties of nanowires in air

Cited by 15 publications

References 29 publications

Current-voltage curves of gold quantum point contacts revisited

Current-voltage curves of gold quantum point contacts revisited

Break Voltage of the 1G0 Contact of Noble Metals and Alloys

Fabrication of Highly Stable Configurable Metal Quantum Point Contacts

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