Laboratoire Charles Coulomb UMR 5221 CNRS/UM2, Université Montpellier 2, Place Eugene Bataillon, 34095 Montpellier Cedex 05, France.
Laboratoire Charles Coulomb UMR 5221 CNRS/UM2, Université Montpellier 2, Place Eugene Bataillon, 34095 Montpellier Cedex 05, France and Ioffe Physical-Technical Institute of the RAS, 26, Politechnicheskaya, 194021 Saint-Petersburg, Russia.
Phys Rev Lett. 2013 Feb 15;110(7):077403. doi: 10.1103/PhysRevLett.110.077403. Epub 2013 Feb 14.
Optical pump-probe experiments reveal spin beats of manganese ions in (Cd,Mn)Te, due to hyperfine and crystal fields. At "magic" orientations of the magnetic field, the effect of local crystal field is strongly suppressed. In this case, the spin precession of Mn(2+) embedded in the lattice approaches the precession expected for the free ion. Following optical excitation, regular spin pulses show up, revealing the one-to-one correspondence between precession frequency and Mn(2+) nuclear spin state. The period of the spin pulses accurately determines the hyperfine constant |A|=705 neV. The manganese spin coherence time up to T(2)(Mn)≃15 ns is measured for a manganese concentration x=0.0011.
光学泵浦探测实验揭示了 (Cd,Mn)Te 中锰离子的自旋拍频现象，这归因于超精细和晶体场的作用。在磁场的“魔法”方向上，局域晶体场的作用被强烈抑制。在这种情况下，嵌入晶格中的 Mn(2+)的自旋进动接近自由离子的进动预期。在光激发之后，出现了规则的自旋脉冲，揭示了进动频率与 Mn(2+)核自旋态之间的一一对应关系。自旋脉冲的周期准确地确定了超精细常数 |A|=705 neV。对于锰浓度 x=0.0011，测量到锰自旋相干时间长达 T(2)(Mn)≃15 ns。
