论文标题
具有集体物质互动的轻型系统中的关键现象
Critical phenomena in light-matter systems with collective matter interactions
论文作者
论文摘要
我们研究了包括集体Qubit Qubit相互作用的广义DICKE模型中量子相图和量子临界现象的发作。通过采用半经典技术，我们分析了相应的经典能量表面，固定点和状态的平滑密度随着哈密顿参数的函数，以确定地面（QPT）或激发态（ESQPT）中的量子相变。我们推出了丰富的相图，新阶段的存在以及由于在独立规范方向上改变了量子位相互作用的强度而产生的新过渡。我们还发现，由于量子相互作用而出现的相位之间的对应关系，而在它们不存在的阶段，但在光耦合中具有不同的非共振项的强度。我们希望我们的工作能够铺平道路，并刺激结合物质 - 物质和光 - 物质相互作用的系统中量子关键的探索。
We study the quantum phase diagram and the onset of quantum critical phenomena in a generalized Dicke model that includes collective qubit-qubit interactions. By employing semiclassical techniques, we analyze the corresponding classical energy surfaces, fixed points, and the smooth Density of States as a function of the Hamiltonian parameters to determine quantum phase transitions in either the ground (QPT) or excited states (ESQPT). We unveil a rich phase diagram, the presence of new phases, and new transitions that result from varying the strength of the qubits interactions in independent canonical directions. We also find a correspondence between the phases emerging due to qubit interactions and those in their absence but with varying the strength of the non-resonant terms in the light-matter coupling. We expect our work to pave the way and stimulate the exploration of quantum criticality in systems combining matter-matter and light-matter interactions.
