Metallic states induced by quantum lattice fluctuations
Metallic states induced by quantum lattice fluctuations
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DOI：
10.1103/physrevb.99.035203
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发表时间：
2019-01
影响因子：
3.7
通讯作者：
N. Tomita;A. Takahashi
中科院分区：
文献类型：
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作者：
N. Tomita;A. Takahashi
我们发展了一个易于处理的多体理论，在这个理论中，超越绝热近似的量子晶格涨落以及电子涨落都可以被描述。通过电子的斯莱特行列式与声子相干态的直积的叠加，构造了一个多体波函数。将该方法应用于具有Su-Schrieffer-Heeger电子-声子耦合的一维电子系统。我们表明，在重掺杂制度，量子晶格涨落由于集体运动的带电孤子造成的幂律奇点的波数依赖的电子densityat费米波数。这表明金属态是由重掺杂诱导的，并且它是Tomonaga-Luttinger液体。目前的结果可以解决一个长期存在的问题，重掺杂聚乙炔的电子状态，泡利顺磁性沿着与一个强的红外活性光吸收共存。
We developed a tractable many-body theory in which quantum lattice fluctuations beyond the adiabatic approximation, as well as electronic fluctuations, can be described. A many-body wave function is constructed by the superposition of direct products of Slater determinants for the electrons and the coherent states of phonons. The method was applied to a one-dimensional electron system with Su-Schrieffer-Heeger electron-phonon coupling. We show that, in the heavily doped regime, the quantum lattice fluctuations due to the collective motion of charged solitons cause a power-law singularity in the wave-number dependence of the electron densityat the Fermi wave number. This indicates that a metallic state is induced by heavy doping, and it is a Tomonaga-Luttinger liquid. The current results can solve a long-standing problem for the electronic state of heavily doped polyacetylene, the coexistence of Pauli paramagnetism along with a strong infrared-active light absorption.