We report the effect of magnetic field induced quantum tunneling and relaxation transitions between orthogonal configurations in polyatomic systems where no tunneling is expected. Typical situations of this kind occur in molecular systems and local centers in crystals in ground and excited electronic $T$ states, subject to the $T\otimes e$ problem of the Jahn-Teller effect, where the wave functions of the three tetragonally distorted configurations are orthogonal. A detailed microscopic theory of this effect shows how the magnetic field violates the orthogonality between the latter allowing for tunneling and relaxations, which decrease in strong fields due to the induced decoherence. The novel effect is demonstrated experimentally as a big, sharp peak in ultrasound attenuation by ${\mathrm{Cr}}^{2+}$ centers in ZnSe:${\mathrm{Cr}}^{2+}$ in the magnetic field $B=0.15$ T at the temperature below 8 K. It may influence a variety of magnetic, electronic, and photonic properties of any system in an electronic $T$ state.

中文翻译：

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磁场引起的固体和分子系统正交构型之间的隧穿和弛豫

我们报告了磁场诱导的量子隧道效应和多原子系统中没有隧道效应的正交构型之间的弛豫转变的影响。这种典型的情况发生在分子系统和地心中的晶体以及受激电子中的局部中心$Ť$ 州，但受 $Ť\otimes Ë$Jahn-Teller效应的问题，其中三个四边形扭曲的构型的波函数是正交的。关于这种效应的详细的微观理论表明，磁场如何违反后者之间的正交性，从而允许隧穿和弛豫，由于诱导的去相干性，强磁场会减小隧穿和弛豫。实验证明，这种新效果是超声波衰减的一个大而尖锐的峰值，${铬}^{\mathrm{2个}+}$ ZnSe中的中心：${铬}^{\mathrm{2个}+}$ 在磁场中 $乙=0.15$ T在低于8 K的温度下。它可能会影响电子系统中任何系统的各种磁，电子和光子特性 $Ť$ 状态。