论文标题
非局部性的解质量子临界点
Deconfined Quantum Critical Point with Non-locality
论文作者
论文摘要
Néel和Valence键固体（VBS）阶之间的量子临界点（DQCP）最初是在局部哈密顿量的量子自旋系统中提出的。在过去的几年中，已经探索了与非本地相互作用的DQCP的类似物，这可能导致丰富的可能性。非局部相互作用可以是由哈密顿量中的瞬时远程相互作用引起的，也可以来自驻留在一个较高空间维度中的无间隙模式。在这里，我们考虑了另一种通过将DQCP耦合到费米表面的“热点”来产生非局部相互作用的机制。我们证明，至少在实质性的能量窗口中，DQCP的物理受到动态指数$ z> 1 $的新固定点的控制
The deconfined quantum critical point (DQCP) between the Néel and valence bond solid (VBS) order was originally proposed in quantum spin systems with a local Hamiltonian. In the last few years analogues of DQCPs with nonlocal interactions have been explored, which can lead to rich possibilities. The nonlocal interactions can either arise from an instantaneous long range interaction in the Hamiltonian, or from gapless modes that reside in one higher spatial dimension. Here we consider another mechanism of generating nonlocal interactions by coupling the DQCP to the "hot spots" of a Fermi surface. We demonstrate that at least within a substantial energy window, the physics of the DQCP is controlled by a new fixed point with dynamical exponent $z > 1$
