Based on the theory of gravitation with torsion developed by Hammond [Rep. Prog. Phys. 65 （2002） 599], thc interaction between the intrinsic spin of a particle and the mass source is calculated. It is shown that spi...Based on the theory of gravitation with torsion developed by Hammond [Rep. Prog. Phys. 65 （2002） 599], thc interaction between the intrinsic spin of a particle and the mass source is calculated. It is shown that spin can interact with the gravitimagnetic field created by a rotational mass, where the spin-rotation coupling is also discussed. According to the recent torsion pendulum experiment with polarized electrons by Heckel et al. [Phys. Rev. Left. 97 （2006） 021603], we set a new limit on the value of the torsion coupling constant K as K E [0.53, 0.95], which has improved many orders than the constraints from the early spln-spin experiment with K 〈 2 × 10^14.展开更多
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
基金The project partially supported by the National Basic Research Program of China under Grant No. 2003CB716300 and National Natural Science Foundation of China under Grant No. 10505009
文摘Based on the theory of gravitation with torsion developed by Hammond [Rep. Prog. Phys. 65 （2002） 599], thc interaction between the intrinsic spin of a particle and the mass source is calculated. It is shown that spin can interact with the gravitimagnetic field created by a rotational mass, where the spin-rotation coupling is also discussed. According to the recent torsion pendulum experiment with polarized electrons by Heckel et al. [Phys. Rev. Left. 97 （2006） 021603], we set a new limit on the value of the torsion coupling constant K as K E [0.53, 0.95], which has improved many orders than the constraints from the early spln-spin experiment with K 〈 2 × 10^14.
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.
