Exact amplitude ratio and finite-size corrections for the MxN square lattice Ising model.

Exact amplitude ratio and finite-size corrections for the MxN square lattice Ising model.
复制标题

MxN 方格伊辛模型的精确振幅比和有限尺寸修正。

DOI:
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发表时间:
2000
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
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通讯作者:
Chin
Chin
中科院分区:
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文献类型:
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作者:
N. Izmailian;Chin

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设f、U和C分别表示具有周期边界条件的M × N正方形晶格上临界伊辛模型的自由能、内能和比热,f(无穷大)表示固定M/N和N->无穷大时的f。我们发现,f、U和C可以写成N(f-f(infinity))=求和算子(infinity)(i=1)f(2 i-1)/N(2 i-1),U=[2]的-平方根+求和算子(infinity)(i=1)u(2 i-1)/N(2 i-1),C=8 ln N/pi+求和算子(infinity)(i=0)c(i)/N(i),即,Nf和U是N(-1)的奇函数。我们还发现u(2 i-1)/c(2 i-1)=1/平方根[2]和u(2 i)/c(2 i)=0(1 <或= i <infinity),并分别得到f,U和C的1/N(5),1/N(5)和1/N(3)阶的封闭形式表达式,这意味着c(5)的解析方程。
Let f, U, and C represent, respectively, the free energy, the internal energy, and the specific heat of the critical Ising model on the MxN square lattice with periodic boundary conditions, and f(infinity) represents f for fixed M/N and N-->infinity. We find that f, U, and C can be written as N(f-f(infinity))= summation operator(infinity)(i=1)f(2i-1)/N(2i-1), U=-square root of [2]+ summation operator(infinity)(i=1)u(2i-1)/N(2i-1), and C=8 ln N/pi+ summation operator(infinity)(i=0)c(i)/N(i), i.e., Nf and U are odd functions of N(-1). We also find that u(2i-1)/c(2i-1)=1/square root of [2] and u(2i)/c(2i)=0 for 1 < or = i <infinity and obtain closed form expressions for f, U, and C up to orders 1/N(5), 1/N(5), and 1/N(3), respectively, which implies an analytic equation for c(5).