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arXiv 0906.3528cond-mat.str-elcond-mat.quant-gas
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一维多组分费米子冷原子中的Half电荷猜想

Haldane charge conjecture in one-dimensional multicomponent fermionic cold atoms

H. Nonne, P. Lecheminant, S. Capponi, G. Roux, E. Boulat

摘要:

对一维光晶格中2N分量费米子冷原子的自旋-单重态电荷模提出了一个Haldman猜想。通过低能量的方法和DMRG计算,我们显示了出现的无隙和有隙的阶段取决于奇偶性的$N$吸引力的相互作用在半填充。自旋为1的海森堡链的Halfton相的类似物是稳定的N=2与非局域弦电荷关联,和赝自旋1/2的边缘状态。这种偶奇行为的核心是自旋单重态赝自旋$N/2$算符的存在,它控制着吸引相互作用模型的低能性质,并产生了Haldom物理。

英文摘要:

A Haldane conjecture is revealed for spin-singlet charge modes in 2N-component fermionic cold atoms loaded into a one-dimensional optical lattice. By means of a low-energy approach and DMRG calculations, we show the emergence of gapless and gapped phases depending on the parity of $N$ for attractive interactions at half-filling. The analogue of the Haldane phase of the spin-1 Heisenberg chain is stabilized for N=2 with non-local string charge correlation, and pseudo-spin 1/2 edge states. At the heart of this even-odd behavior is the existence of a spin-singlet pseudo-spin $N/2$ operator which governs the low-energy properties of the model for attractive interactions and gives rise to the Haldane physics.

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