Universal scattering with general dispersion relations
Many synthetic quantum systems allow particles to have dispersion relations that are neither linear nor quadratic functions. Here, we explore single-particle scattering in general spatial dimension D≥1 when the density of states diverges at a specific energy. To illustrate the underlying principles...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-04-01
|
| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.023014 |
| _version_ | 1797210831003320320 |
|---|---|
| author | Yidan Wang Michael J. Gullans Xuesen Na Seth Whitsitt Alexey V. Gorshkov |
| author_facet | Yidan Wang Michael J. Gullans Xuesen Na Seth Whitsitt Alexey V. Gorshkov |
| author_sort | Yidan Wang |
| collection | DOAJ |
| description | Many synthetic quantum systems allow particles to have dispersion relations that are neither linear nor quadratic functions. Here, we explore single-particle scattering in general spatial dimension D≥1 when the density of states diverges at a specific energy. To illustrate the underlying principles in an experimentally relevant setting, we focus on waveguide quantum electrodynamics (QED) problems (i.e., D=1) with dispersion relation ε(k)=±|d|k^{m}, where m≥2 is an integer. For a large class of these problems for any positive integer m, we rigorously prove that when there are no bright zero-energy eigenstates, the S matrix evaluated at an energy E→0 converges to a universal limit that is only dependent on m. We also give a generalization of a key index theorem in quantum scattering theory known as Levinson's theorem—which relates the scattering phases to the number of bound states—to waveguide QED scattering for these more general dispersion relations. We then extend these results to general integer dimensions D≥1, dispersion relations ε(k)=|k|^{a} for a D-dimensional momentum vector k with any real positive a, and separable potential scattering. |
| first_indexed | 2024-04-24T10:16:50Z |
| format | Article |
| id | doaj.art-f8985b3191de4b089603c0d2b1c81227 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:16:50Z |
| publishDate | 2022-04-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-f8985b3191de4b089603c0d2b1c812272024-04-12T17:19:39ZengAmerican Physical SocietyPhysical Review Research2643-15642022-04-014202301410.1103/PhysRevResearch.4.023014Universal scattering with general dispersion relationsYidan WangMichael J. GullansXuesen NaSeth WhitsittAlexey V. GorshkovMany synthetic quantum systems allow particles to have dispersion relations that are neither linear nor quadratic functions. Here, we explore single-particle scattering in general spatial dimension D≥1 when the density of states diverges at a specific energy. To illustrate the underlying principles in an experimentally relevant setting, we focus on waveguide quantum electrodynamics (QED) problems (i.e., D=1) with dispersion relation ε(k)=±|d|k^{m}, where m≥2 is an integer. For a large class of these problems for any positive integer m, we rigorously prove that when there are no bright zero-energy eigenstates, the S matrix evaluated at an energy E→0 converges to a universal limit that is only dependent on m. We also give a generalization of a key index theorem in quantum scattering theory known as Levinson's theorem—which relates the scattering phases to the number of bound states—to waveguide QED scattering for these more general dispersion relations. We then extend these results to general integer dimensions D≥1, dispersion relations ε(k)=|k|^{a} for a D-dimensional momentum vector k with any real positive a, and separable potential scattering.http://doi.org/10.1103/PhysRevResearch.4.023014 |
| spellingShingle | Yidan Wang Michael J. Gullans Xuesen Na Seth Whitsitt Alexey V. Gorshkov Universal scattering with general dispersion relations Physical Review Research |
| title | Universal scattering with general dispersion relations |
| title_full | Universal scattering with general dispersion relations |
| title_fullStr | Universal scattering with general dispersion relations |
| title_full_unstemmed | Universal scattering with general dispersion relations |
| title_short | Universal scattering with general dispersion relations |
| title_sort | universal scattering with general dispersion relations |
| url | http://doi.org/10.1103/PhysRevResearch.4.023014 |
| work_keys_str_mv | AT yidanwang universalscatteringwithgeneraldispersionrelations AT michaeljgullans universalscatteringwithgeneraldispersionrelations AT xuesenna universalscatteringwithgeneraldispersionrelations AT sethwhitsitt universalscatteringwithgeneraldispersionrelations AT alexeyvgorshkov universalscatteringwithgeneraldispersionrelations |