All-optically induced ultrafast photocurrents: beyond the instantaneous coherent response.

All-optically induced ultrafast photocurrents: beyond the instantaneous coherent response.
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全光感应超快光电流:超越瞬时相干响应

DOI:
10.1103/physrevlett.109.216601
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发表时间:
2012
影响因子:
8.6
通讯作者:
M. Bieler
M. Bieler
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
S. Priyadarshi;K. Pierz;M. Bieler

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结果表明,光致相干极化的非瞬时响应极大地影响了半导体中电荷的实空间位移。相干地控制这种实空间移位与时间上不重叠的激励脉冲的可能性允许观察一种新类型的移位电流,其仅存在于某些偏振成形的激励脉冲中并且在连续波极限中消失。与先前研究的移位电流相比,新电流需要两个正交跃迁偶极矩之间的相位失配,并且在非线性二阶描述内导致相对于两个激励电场振幅的阶反对称的张量。这些观测,甚至可以在室温下进行,预计将发生在各种半导体晶体类,有助于更好地理解光物质相互作用,涉及简并带。因此,他们预计将被证明是重要的未来研究的相干和非线性光学效应的半导体。
It is demonstrated that the noninstantaneous response of the optically induced coherent polarization tremendously influences the real-space shift of electronic charges in semiconductors. The possibility of coherently controlling this real-space shift with temporally nonoverlapping excitation pulses allows for the observation of a new type of shift current, which only exists for certain polarization-shaped excitation pulses and vanishes in the continuous-wave limit. In contrast to previously studied shift currents, the new current requires a phase mismatch between two orthogonal transition dipole moments and leads, within a nonlinear second-order description, to a tensor which is antisymmetric with respect to the order of the two exciting electric field amplitudes. These observations, which can even be made at room temperature and are expected to occur in a variety of semiconductor crystal classes, contribute to a better understanding of light-matter interaction involving degenerate bands. Thus, they are expected to prove important for future studies of coherent and nonlinear optical effects in semiconductors.
DOI: 10.1103/physrevb.82.115316
发表时间: 2010-09
期刊: Physical Review B
影响因子: 3.7
作者:
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通过未掺杂 GaAs 量子阱中的能带混合反转相干控制的超快光电流。
DOI: 10.1103/physrevlett.104.217401
发表时间: 2010
影响因子: 8.6
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S. Priyadarshi;A. Racu;K. Pierz;U. Siegner;M. Bieler;H. T. Duc;J. Förstner;T. Meier
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