Finite-temperature decoherence of spin states in a {Cu₃} single molecular magnet

Abstract

We investigate the quantum evolution of spin states of a single molecular magnet in a local electric field. The decoherence of a {Cu 3 } single molecular magnet weakly coupled to a thermal bosonic environment can be analyzed by the spin-boson model. Using the finite-temperature time-convolutionless quantum master equation, we obtain the analytical expression of the reduced density matrix of the system in the secular approximation. The suppressed and revived dynamical behavior of the spin states are presented by the oscillation of the chirality spin polarization on the time scale of the correlation time of the environment. The quantum decoherence can be effectively restrained with the help of the manipulation of local electric field and the environment spectral density function. Under the influence of the dissipation, the pointer states measured by the von Neumann entropy are calculated to manifest the entanglement property of the system-environment model.

Magnetocaloric properties of V6 molecular magnet

“…This is, mainly, due to the fact that antiferromagnetically coupled triangle is an archetypical example of magnetically frustrated system [8]. The mentioned class of molecular magnets includes those based on Mn ions [9] or Cu ions [6,[10][11][12][13]. A distinct group within this class consists of various polyoxovanadates containing S = 1/2 spins originating from vanadium ions gathering such examples as V3 [14][15][16][17][18], V6 [19][20][21][22][23], V12 [24] and particularly frequently investigated V15 [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] clusters.…”

Non-Markovianity and Indivisible Quantum dynamics of a Apin- S System

“…According to the results of Ref. [8], the oscillations of the decaying rates γ j (j = ±) between negative values and positive ones are enhanced at some finite temperatures. Therefore, the non-Markovian behavior is also demonstrated in the condition of finite low temperatures.…”

Thermal quantum speed limit for classical-driving open systems

“…and C 0 = √ C + C − . Then the expression of the time-convolutionless master equation in the dressed state basis is given as [40,41]…”