一維具有近平帶鋸齒鏈模型的拓?fù)湎嘧?/H1>
發(fā)布時(shí)間：2018-04-03 03:35
本文選題：拓?fù)湎嘧?/strong> 切入點(diǎn)：光晶格 出處：《山西大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年03期
【摘要】：研究了一維具有周期性調(diào)制的鋸齒鏈模型的近平帶和拓?fù)湎嘧儐栴}。在無周期性調(diào)制情況下,標(biāo)準(zhǔn)的鋸齒鏈模型出現(xiàn)平帶的條件為沿著對角線方向的躍遷強(qiáng)度是沿著底線方向的2~(1/2)倍,但是此時(shí)平帶為拓?fù)淦接沟�。引入周期性調(diào)制后,系統(tǒng)出現(xiàn)一系列近平帶,且具有非零的整數(shù)陳數(shù),具有拓?fù)浞瞧接沟男再|(zhì)。通過改變調(diào)制強(qiáng)度,系統(tǒng)伴隨著拓?fù)鋽?shù)和能隙的變化出現(xiàn)一系列拓?fù)湎嘧儭＿@一模型可以在現(xiàn)階段冷原子系統(tǒng)中實(shí)現(xiàn)。
[Abstract]:In this paper, the near flat band and topological phase transition of one dimensional sawtooth chain model with periodic modulation are studied.In the case of no periodic modulation, the condition for the standard sawtooth chain model to appear flat band is that the intensity of transition along diagonal direction is 2 / 1 / 2 of that along the bottom line, but the flat band is topological mediocre at this time.When the periodic modulation is introduced, a series of near flat bands appear in the system, and the system has non-zero integer number, which has the property of topological non-mediocrity.By changing the modulation intensity, a series of topological transitions appear along with the changes of the topological number and the band gap.This model can be implemented in cold atomic systems at this stage.
【作者單位】： 山西大學(xué)理論物理研究所;山西醫(yī)科大學(xué)基礎(chǔ)醫(yī)學(xué)院物理教研室;
【基金】：國家自然科學(xué)基金(11604188) 山西省基礎(chǔ)研究青年基金(2016021027)
【分類號(hào)】：O413;O469
【相似文獻(xiàn)】
相關(guān)期刊論文 前1條
1 劉春揚(yáng);渺位四角系統(tǒng)及其完美匹配數(shù)[J];漳州師范學(xué)院學(xué)報(bào)(自然科學(xué)版);2005年03期
，
本文編號(hào)：1703470
本文鏈接：http://sikaile.net/kejilunwen/wulilw/1703470.html
本文選題：拓?fù)湎嘧?/strong> 切入點(diǎn)：光晶格 出處：《山西大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年03期
【摘要】：研究了一維具有周期性調(diào)制的鋸齒鏈模型的近平帶和拓?fù)湎嘧儐栴}。在無周期性調(diào)制情況下,標(biāo)準(zhǔn)的鋸齒鏈模型出現(xiàn)平帶的條件為沿著對角線方向的躍遷強(qiáng)度是沿著底線方向的2~(1/2)倍,但是此時(shí)平帶為拓?fù)淦接沟�。引入周期性調(diào)制后,系統(tǒng)出現(xiàn)一系列近平帶,且具有非零的整數(shù)陳數(shù),具有拓?fù)浞瞧接沟男再|(zhì)。通過改變調(diào)制強(qiáng)度,系統(tǒng)伴隨著拓?fù)鋽?shù)和能隙的變化出現(xiàn)一系列拓?fù)湎嘧儭＿@一模型可以在現(xiàn)階段冷原子系統(tǒng)中實(shí)現(xiàn)。
[Abstract]:In this paper, the near flat band and topological phase transition of one dimensional sawtooth chain model with periodic modulation are studied.In the case of no periodic modulation, the condition for the standard sawtooth chain model to appear flat band is that the intensity of transition along diagonal direction is 2 / 1 / 2 of that along the bottom line, but the flat band is topological mediocre at this time.When the periodic modulation is introduced, a series of near flat bands appear in the system, and the system has non-zero integer number, which has the property of topological non-mediocrity.By changing the modulation intensity, a series of topological transitions appear along with the changes of the topological number and the band gap.This model can be implemented in cold atomic systems at this stage.
【作者單位】： 山西大學(xué)理論物理研究所;山西醫(yī)科大學(xué)基礎(chǔ)醫(yī)學(xué)院物理教研室;
【基金】：國家自然科學(xué)基金(11604188) 山西省基礎(chǔ)研究青年基金(2016021027)
【分類號(hào)】：O413;O469
【相似文獻(xiàn)】
相關(guān)期刊論文 前1條
1 劉春揚(yáng);渺位四角系統(tǒng)及其完美匹配數(shù)[J];漳州師范學(xué)院學(xué)報(bào)(自然科學(xué)版);2005年03期
，本文編號(hào)：1703470
本文鏈接：http://sikaile.net/kejilunwen/wulilw/1703470.html
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