| Full text | |
| Author(s): |
de Koning, Maurice
;
Cai, Wei
Total Authors: 2
|
| Document type: | Journal article |
| Source: | NPJ QUANTUM MATERIALS; v. 7, n. 1, p. 7-pg., 2022-12-27. |
| Abstract | |
Quantum behavior at mesoscopic length scales is of significant interest, both from a fundamental-physics standpoint, as well as in the context of technological advances. In this light, the description of collective variables comprising large numbers of atoms, but nevertheless displaying non-classical behavior, is a fundamental problem. Here, we show that an effective-Hamiltonian approach for such variables, as has been applied to describe the quantum behavior of coupled qubit/oscillator systems, can also be very useful in understanding intrinsic behavior of quantum materials. We consider lattice dislocations - naturally occurring mesoscopic line defects in crystals - in the prototypical bosonic quantum crystal, solid He-4. For this purpose, we map fully atomistic quantum simulations onto effective one-dimensional Hamiltonians in which the collective dislocation-position variables are represented as interacting, massive quantum particles. The results provide quantitative understanding of several experimental observations in solid He-4. (AU) | |
| FAPESP's process: | 13/08293-7 - CCES - Center for Computational Engineering and Sciences |
| Grantee: | Munir Salomao Skaf |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 16/23891-6 - Computer modeling of condensed matter |
| Grantee: | Alex Antonelli |
| Support Opportunities: | Research Projects - Thematic Grants |