Papers › Geometry-induced wavefunction collapse
Geometry-induced wavefunction collapse
Li-Li Ye, Chen-Di Han, Liang Huang, Ying-Cheng Lai
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When a quantum particle moves in a curved space, a geometric potential can arise. In spite of a long history of extensive theoretical studies, to experimentally observe the geometric potential remains to be a challenge. What are the physically observable consequences of such a geometric potential? Solving the Schrodinger equation on a truncated conic surface, we uncover a class of quantum scattering states that bear a strong resemblance with the quasi-resonant states associated with atomic collapse about a Coulomb impurity, a remarkable quantum phenomenon in which an infinite number of quasi-resonant states emerge. A characteristic defining feature of such collapse states is the infinite oscillations of the local density of states (LDOS) about the zero energy point separating the scattering from the bound states. The emergence of such states in the curved (Riemannian) space requires neither a relativistic quantum mechanism nor any Coulomb impurity: they have zero angular momentum and their origin is purely geometrical - henceforth the term geometry-induced wavefunction collapse. We establish the collapsing nature of these states through a detailed comparative analysis of the behavior of the LDOS for both the zero and finite angular-momentum states as well as the corresponding classical picture. Potential experimental schemes to realize the geometry-induced collapse states are articulated. Not only has our study uncovered an intrinsic connection between the geometric potential and atomic collapse, it also provides a method to experimentally observe and characterize geometric potentials arising from different subfields of physics. For example, in nanoscience and nanotechnology, curved geometry has become increasingly common. Our finding suggests that wavefunction collapse should be an important factor of consideration in designing and developing nanodevices.
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