Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
Phys Rev Lett. 2011 Jan 28;106(4):045502. doi: 10.1103/PhysRevLett.106.045502. Epub 2011 Jan 25.
We show that the interaction between flexural phonons, when corrected by the exchange of electron-hole excitations, may drive the graphene sheet into a quantum critical point characterized by the vanishing of the bending rigidity of the membrane. Ripples arise then due to spontaneous symmetry breaking, following a mechanism similar to that responsible for the condensation of the Higgs field in relativistic field theories, and leading to a zero-temperature buckling transition in which the order parameter is given by the square of the gradient of the flexural phonon field.
我们表明，在修正了电子-空穴激发交换后的弯曲声子相互作用，可能会将石墨烯片推向一个量子临界点，其特征是膜的弯曲刚度消失。然后，由于自发对称破缺，会出现波纹，这类似于相对论场论中希格斯场凝聚的机制，并导致零温屈曲相变，其中序参量由弯曲声子场的梯度的平方给出。
