论文标题
从伪制品金属到费米液体使用Ancilla Qubits
From the pseudogap metal to the Fermi liquid using ancilla qubits
论文作者
论文摘要
我们提出了一种新的Parton理论的孔掺杂铜矿，描述了带有小费米表面的伪制成金属的演变到具有大费米表面的常规费米液体。我们在每个平方晶格位置介绍2个Ancilla Qubits，并使用它们来获取用于假pap金属状态的分数化费米液体的变异波函数。我们为丘比特提出了一个多层hamiltonion，电子驻留在“物理”层中，而ancilla量子位则为两个“隐藏”层：可以通过将隐藏的图层留在一个微不足道的距离状态中的规范变换来从物理层中脱钩。该哈密顿量产生了一种新兴的轨距理论，不仅描述了分数化的费米液体，还描述了常规的费米液体，以及可能的异国情调中间阶段和临界点。分数化的费米液体的孔口袋和准粒子重量仅在“费米弧”上很大，而费米子旋转激发型则带有新兴量规场的电荷。
We propose a new parton theory of the hole-doped cuprates, describing the evolution from the pseudogap metal with small Fermi surfaces to the conventional Fermi liquid with a large Fermi surface. We introduce 2 ancilla qubits per square lattice site, and employ them to obtain a variational wavefunction of a fractionalized Fermi liquid for the pseudogap metal state. We propose a multi-layer Hamiltonion for the cuprates, with the electrons residing in the 'physical' layer, and the ancilla qubits in two 'hidden' layers: the hidden layers can be decoupled from the physical layer by a canonical transformation which leaves the hidden layers in a trivial gapped state. This Hamiltonian yields an emergent gauge theory which describes not only the fractionalized Fermi liquid, but also the conventional Fermi liquid, and possible exotic intermediate phases and critical points. The fractionalized Fermi liquid has hole pockets with quasiparticle weight which is large only on "Fermi arcs", and fermionic spinon excitations which carry charges of the emergent gauge fields.
