【摘 要】
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The time-dependent Lanczos method is employed to investigate the ultrafast non-equilibrium response of a one-dimensional strongly correlated system,i.e.,the half-filled extended Hubbard model,when it
【出 处】
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第十二届国际凝聚态理论与计算材料学会议(The 12th International Conference on Con
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The time-dependent Lanczos method is employed to investigate the ultrafast non-equilibrium response of a one-dimensional strongly correlated system,i.e.,the half-filled extended Hubbard model,when it is subjected to an external field.Our main results can be summarized as follows: in the case of single pulse being applied,near the phase boundary of the spin-density-wave(SDW)and the charge-density-wave(CDW),a local charge(spin)order enhancement can be aroused from the SDW(CDW)side by a carefully tuned laser pulse.Thus,to some extend,a phase cross can be realized out of equilibrium in the 1D system [1,2].On the other hand,for the double-pulse case,in the region of the SDW phase where isolated excitonic excitations are supported,the system can be excited first and then deexcited by t,^ro successive pulses,if their relative phase matches some specific values.Our simulations demonstrate an interesting example of the controllability of ultrafast transition between excited and deexcited phases in strongly correlated electron systems [3].
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