Spin-rotation coupling(SRC)is a fundamental interaction that connects electronic spins with the rotational motion of a medium.We elucidate the Einstein-de Haas(EdH)effect and its inverse with SRC as the microscopic me...Spin-rotation coupling(SRC)is a fundamental interaction that connects electronic spins with the rotational motion of a medium.We elucidate the Einstein-de Haas(EdH)effect and its inverse with SRC as the microscopic mechanism using the dynamic spin-lattice equations derived by elasticity theory and Lagrangian formalism.By applying the coupling equations to an iron disk in a magnetic field,we exhibit the transfer of angular momentum and energy between spins and lattice,with or without damping.The timescale of the angular momentum transfer from spins to the entire lattice is estimated by our theory to be on the order of 0.01 ns,for the disk with a radius of 100 nm.Moreover,we discover a linear relationship between the magnetic field strength and the rotation frequency,which is also enhanced by a higher ratio of Young’s modulus to Poisson’s coefficient.In the presence of damping,we notice that the spin-lattice relaxation time is nearly inversely proportional to the magnetic field.Our explorations will contribute to a better understanding of the EdH effect and provide valuable insights for magneto-mechanical manufacturing.展开更多
The objects of the investigation were uniformly Ag~＋ doped Hg_（0.76）Cd_（0.24） Te mercury chalcogenide monocrystals obtained by ion implantation with subsequent thermal annealing over 20 days. After implantation a...The objects of the investigation were uniformly Ag~＋ doped Hg_（0.76）Cd_（0.24） Te mercury chalcogenide monocrystals obtained by ion implantation with subsequent thermal annealing over 20 days. After implantation and annealing the conductivity was inverted from n-type with carrier concentration of 10^（16） cm^（-3） to p-type with carrier concentration of ≈ 3.9 × 10^（15） cm^（-3）. The investigations of microwave absorption derivative（d P/d H） showed the existence of strong oscillations in the magnetic field for Ag：Hg_（0.76）Cd_（0.24） Te in the temperature range 4.2–12 K. The concentration and effective mass of charge carrier were determined from oscillation period and temperature dependency of oscillation amplitude. We suppose that this phenomenon is similar to the de Haas–van Alphen effect in weakly correlated electron system with imperfect nesting vector.展开更多
基金supported by NKRDPC-2022YFA1402802,NSFC-92165204,NKRDPC2018YFA0306001,NSFC-11974432Leading Talent Program of Guangdong Special Projects(201626003)supported by the National Natural Science Foundation of China under Grant No.NSFPHY-1748958.
文摘Spin-rotation coupling(SRC)is a fundamental interaction that connects electronic spins with the rotational motion of a medium.We elucidate the Einstein-de Haas(EdH)effect and its inverse with SRC as the microscopic mechanism using the dynamic spin-lattice equations derived by elasticity theory and Lagrangian formalism.By applying the coupling equations to an iron disk in a magnetic field,we exhibit the transfer of angular momentum and energy between spins and lattice,with or without damping.The timescale of the angular momentum transfer from spins to the entire lattice is estimated by our theory to be on the order of 0.01 ns,for the disk with a radius of 100 nm.Moreover,we discover a linear relationship between the magnetic field strength and the rotation frequency,which is also enhanced by a higher ratio of Young’s modulus to Poisson’s coefficient.In the presence of damping,we notice that the spin-lattice relaxation time is nearly inversely proportional to the magnetic field.Our explorations will contribute to a better understanding of the EdH effect and provide valuable insights for magneto-mechanical manufacturing.
文摘The objects of the investigation were uniformly Ag~＋ doped Hg_（0.76）Cd_（0.24） Te mercury chalcogenide monocrystals obtained by ion implantation with subsequent thermal annealing over 20 days. After implantation and annealing the conductivity was inverted from n-type with carrier concentration of 10^（16） cm^（-3） to p-type with carrier concentration of ≈ 3.9 × 10^（15） cm^（-3）. The investigations of microwave absorption derivative（d P/d H） showed the existence of strong oscillations in the magnetic field for Ag：Hg_（0.76）Cd_（0.24） Te in the temperature range 4.2–12 K. The concentration and effective mass of charge carrier were determined from oscillation period and temperature dependency of oscillation amplitude. We suppose that this phenomenon is similar to the de Haas–van Alphen effect in weakly correlated electron system with imperfect nesting vector.
