Yes, there is a concept of "opposite" particles to conduction electrons, known as positrons.
Conduction electrons are negatively charged particles that are responsible for the flow of electric current in materials like metals. They are part of the electron sea or electron cloud in a material's atomic structure.
Positrons, on the other hand, are positively charged particles and are considered antiparticles to electrons. Antiparticles have the same mass as their corresponding particles but opposite electric charge. The positron was first theorized by Paul Dirac in 1928, and its existence was later confirmed through experimental observations.
When a positron encounters an electron, they can annihilate each other, resulting in the production of energy in the form of gamma-ray photons. This annihilation process is a consequence of the opposite charges of the particles. Positrons are also involved in other particle interactions and are used in various scientific and medical applications, such as in positron emission tomography (PET) imaging.
It's important to note that in the context of conduction in materials, the term "opposite" refers to opposite charge rather than being strictly complementary in terms of their role in conduction. Both electrons and positrons can participate in electrical conduction, but in most common materials at normal conditions, it is the presence of conduction electrons that dominates the conduction behavior. Positrons are typically not abundant in ordinary matter and require specialized conditions or processes to be produced or observed.