Berry-phase effects in transport through single Jahn-Teller molecules
Berry-phase effects in transport through single Jahn-Teller molecules
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DOI：
10.1103/physrevb.77.075323
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发表时间：
2007-02
影响因子：
3.7
通讯作者：
M. Schultz;T. Nunner;F. Oppen
中科院分区：
文献类型：
--
作者：
M. Schultz;T. Nunner;F. Oppen
Jahn-Teller 分子的振动模式受到贝里相的影响，贝里相与绝热势的圆锥相交相关。我们从理论上研究了当隧道电子在对称电荷态和 Jahn-Teller 扭曲电荷态之间切换分子时，Berry 相对单个 $E\ensuremath{\bigotimes}e$ Jahn-Teller 分子的电子传输特性的影响。我们发现，贝里相与光谱捕获机制相结合，甚至在库仑封锁之外的区域也会导致电流封锁。封锁在栅极电压上是强烈不对称的，并引起明显的负微分电导。
The vibrational modes of Jahn-Teller molecules are affected by a Berry phase that is associated with a conical intersection of the adiabatic potentials. We investigate theoretically the effect of this Berry phase on the electronic transport properties of a single $E\ensuremath{\bigotimes}e$ Jahn-Teller molecule when the tunneling electrons continually switch the molecule between a symmetric and a Jahn-Teller distorted charge state. We find that the Berry phase, in conjunction with a spectral trapping mechanism, leads to a current-blockade even in regions outside the Coulomb blockade. The blockade is strongly asymmetric in the gate voltage and induces pronounced negative differential conductance.