Nanofabricated adjustable multicontact devices on membranes

Area of Science:

• * Condensed matter physics
• * Nanotechnology
• * Materials science

Background:

• * Break junction techniques are standard tools for realizing adjustable atomic-size contacts.
• * Current methods are limited to a single adjustable junction per device, hindering integration into complex circuits.

Purpose of the Study:

• * To fabricate devices with multiple independently controllable break junctions.
• * To overcome the limitation of single-junction devices in nanofabrication.
• * To demonstrate the feasibility of addressing multiple junctions on a single chip.

Main Methods:

• * Fabrication of single and dual break junction devices on a silicon membrane.
• * Utilization of piezocontrol for precise tip positioning on the membrane's rear side.
• * Characterization of gold and platinum circuits with stabilized contacts.

Main Results:

• * Successful fabrication of devices containing two independently addressable break junctions.
• * Demonstration of independent control over junction adjustment via tip positioning.
• * Stabilization of various contact types, including single-atom, vacuum tunneling, and larger contacts.

Conclusions:

• * The developed technique allows for multiple independently adjustable break junctions on a single device.
• * This overcomes a key limitation of standard break junction methods.
• * The approach is suitable for integration into more complex electronic circuits.