Title: The Statistical Mechanics of Nonequilibrium Spins
When: Thursday, September 12, 2024, 12:00
Place: Department of Theoretical Condensed Matter Physics, Faculty of Sciences, Module 5, Seminar Room (5th Floor)
Speaker: Juan David Jaramillo, Instituto de Física Interdisciplinar y de Sistemas Complejos (IFISC), Spain.
Quantum state engineering has emerged in the last decade as an extremely relevant area of quantum information science due to the high demand of these type of structures for writing and reading quantum information, and for performing quantum operations in nanoscale machines operating beyond the classical realm. Different technologies have been used to prepare quantum states, among which we encounter the spin alternative as a attractive proposal as they can be manipulated electrically, what has been experimentally realized using different set ups based of single-molecule-magnet tunnel junctions. Here, we derive the statistical mechanics at finite temperature of a dimer of spins in the absence and in the presence of symmetry breaking interactions, particularly we refer to time reversal symmetry and space inversion symmetry. We particularly show that in the absence of time reversal symmetry breaking, and hence for vanishing spin expectation values, the spin quantum state will have no influence on the observables depending on the device Green’s function, and hence, to read and write information from engineered quantum states, time reversal symmetry must be broken.
