Quantum criticality of reconstructing Fermi surfaces in antiferromagnetic metals
Quantum criticality of reconstructing Fermi surfaces in antiferromagnetic metals
复制标题
反铁磁金属中重建费米表面的量子临界性
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Sachdev
中科院分区：
文献类型：
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作者：
Junhyung Lee;P. Strack;S. Sachdev
我们提出了二维金属中涉及费米表面重建的量子临界点的功能重整化群分析，这是由于自旋密度波序的开始。它的临界理论是由序参量与费米子准粒子强耦合的不动点所控制，并获得具有共同动态临界指数的谱函数。我们得到了临界指数和准粒子谱权在费米表面周围变化的结果。我们的分析是在自旋费米子模型的两波段变体上实现的，这将允许与无符号问题的量子蒙特卡罗模拟进行比较。
We present a functional renormalization group analysis of a quantum critical point in two-dimensional metals involving Fermi surface reconstruction due to the onset of spin-density wave order. Its critical theory is controlled by a fixed point in which the order parameter and fermionic quasiparticles are strongly coupled and acquire spectral functions with a common dynamic critical exponent. We obtain results for critical exponents and for the variation in the quasiparticle spectral weight around the Fermi surface. Our analysis is implemented on a two-band variant of the spin-fermion model which will allow comparison with sign-problem-free quantum Monte Carlo simulations.