Two-photon pathway to ultracold ground state molecules of [superscript 23]Na [superscript 40]K
We report on high-resolution spectroscopy of ultracold fermionic [superscript 23]Na[superscript 40]K Feshbach molecules, and identify a two-photon pathway to the rovibrational singlet ground state via a resonantly mixed B[superscript 1]Π ~ c[superscript 3]Σ[superscript +]intermediate state. Photoass...
| Main Authors: | , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
IOP Publishing
2015
|
| Online Access: | http://hdl.handle.net/1721.1/100045 https://orcid.org/0000-0003-4329-5163 https://orcid.org/0000-0001-8120-8548 https://orcid.org/0000-0003-2672-5264 |
| _version_ | 1826203413036138496 |
|---|---|
| author | Park, Jee Woo Will, Sebastian Zwierlein, Martin Wolfram |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Park, Jee Woo Will, Sebastian Zwierlein, Martin Wolfram |
| author_sort | Park, Jee Woo |
| collection | MIT |
| description | We report on high-resolution spectroscopy of ultracold fermionic [superscript 23]Na[superscript 40]K Feshbach molecules, and identify a two-photon pathway to the rovibrational singlet ground state via a resonantly mixed B[superscript 1]Π ~ c[superscript 3]Σ[superscript +]intermediate state. Photoassociation in a [superscript 23]Na–[superscript 40]K atomic mixture and one-photon spectroscopy on [superscript 23]Na[superscript 40]K Feshbach molecules reveal about 20 vibrational levels of the electronically excited c[superscript 3]Σ[superscript +]state. Two of these levels are found to be strongly perturbed by nearby B[superscript 1]Π levels via spin–orbit coupling, resulting in additional lines of dominant singlet character in the perturbed complex B[superscript 1}Π |v = 4〉 ~ c[superscript 3]∑[superscript +] v = 25〉, or of resonantly mixed character in B[superscript 1}Π |v = 12〉 ~ c[superscript 3]∑[superscript +] v = 35〉. The dominantly singlet level is used to locate the absolute rovibrational singlet ground state X[superscript 1]∑[superscript +] |v = 0, J = 0〉 via Autler–Townes spectroscopy. We demonstrate coherent two-photon coupling via dark state spectroscopy between the predominantly triplet Feshbach molecular state and the singlet ground state. Its binding energy is measured to be 5212.0447(1) cm[superscript −1], a thousand-fold improvement in accuracy compared to previous determinations. In their absolute singlet ground state, [superscript 23]Na[superscript 40]K molecules are chemically stable under binary collisions and possess a large electric dipole moment of 2.72 Debye. Our work thus paves the way towards the creation of strongly dipolar Fermi gases of NaK molecules. |
| first_indexed | 2024-09-23T12:36:35Z |
| format | Article |
| id | mit-1721.1/100045 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:36:35Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1000452022-10-01T10:04:30Z Two-photon pathway to ultracold ground state molecules of [superscript 23]Na [superscript 40]K Park, Jee Woo Will, Sebastian Zwierlein, Martin Wolfram Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Research Laboratory of Electronics Park, Jee Woo Will, Sebastian Zwierlein, Martin Wolfram We report on high-resolution spectroscopy of ultracold fermionic [superscript 23]Na[superscript 40]K Feshbach molecules, and identify a two-photon pathway to the rovibrational singlet ground state via a resonantly mixed B[superscript 1]Π ~ c[superscript 3]Σ[superscript +]intermediate state. Photoassociation in a [superscript 23]Na–[superscript 40]K atomic mixture and one-photon spectroscopy on [superscript 23]Na[superscript 40]K Feshbach molecules reveal about 20 vibrational levels of the electronically excited c[superscript 3]Σ[superscript +]state. Two of these levels are found to be strongly perturbed by nearby B[superscript 1]Π levels via spin–orbit coupling, resulting in additional lines of dominant singlet character in the perturbed complex B[superscript 1}Π |v = 4〉 ~ c[superscript 3]∑[superscript +] v = 25〉, or of resonantly mixed character in B[superscript 1}Π |v = 12〉 ~ c[superscript 3]∑[superscript +] v = 35〉. The dominantly singlet level is used to locate the absolute rovibrational singlet ground state X[superscript 1]∑[superscript +] |v = 0, J = 0〉 via Autler–Townes spectroscopy. We demonstrate coherent two-photon coupling via dark state spectroscopy between the predominantly triplet Feshbach molecular state and the singlet ground state. Its binding energy is measured to be 5212.0447(1) cm[superscript −1], a thousand-fold improvement in accuracy compared to previous determinations. In their absolute singlet ground state, [superscript 23]Na[superscript 40]K molecules are chemically stable under binary collisions and possess a large electric dipole moment of 2.72 Debye. Our work thus paves the way towards the creation of strongly dipolar Fermi gases of NaK molecules. National Science Foundation (U.S.) United States. Air Force Office of Scientific Research (Presidential Early Career Award for Scientists and Engineers) United States. Army Research Office United States. Army Research Office. Multidisciplinary University Research Initiative United States. Air Force Office of Scientific Research. Multidisciplinary University Research Initiative David & Lucile Packard Foundation 2015-11-24T20:13:22Z 2015-11-24T20:13:22Z 2015-07 2015-05 Article http://purl.org/eprint/type/JournalArticle 1367-2630 http://hdl.handle.net/1721.1/100045 Park, Jee Woo, Sebastian A Will, and Martin W Zwierlein. “Two-Photon Pathway to Ultracold Ground State Molecules of [superscript 23]Na [superscript 40]K.” New J. Phys. 17, no. 7 (July 1, 2015): 075016. © 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft https://orcid.org/0000-0003-4329-5163 https://orcid.org/0000-0001-8120-8548 https://orcid.org/0000-0003-2672-5264 en_US http://dx.doi.org/10.1088/1367-2630/17/7/075016 New Journal of Physics Creative Commons Attribution http://creativecommons.org/licenses/by/3.0/ application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Park, Jee Woo Will, Sebastian Zwierlein, Martin Wolfram Two-photon pathway to ultracold ground state molecules of [superscript 23]Na [superscript 40]K |
| title | Two-photon pathway to ultracold ground state molecules of [superscript 23]Na [superscript 40]K |
| title_full | Two-photon pathway to ultracold ground state molecules of [superscript 23]Na [superscript 40]K |
| title_fullStr | Two-photon pathway to ultracold ground state molecules of [superscript 23]Na [superscript 40]K |
| title_full_unstemmed | Two-photon pathway to ultracold ground state molecules of [superscript 23]Na [superscript 40]K |
| title_short | Two-photon pathway to ultracold ground state molecules of [superscript 23]Na [superscript 40]K |
| title_sort | two photon pathway to ultracold ground state molecules of superscript 23 na superscript 40 k |
| url | http://hdl.handle.net/1721.1/100045 https://orcid.org/0000-0003-4329-5163 https://orcid.org/0000-0001-8120-8548 https://orcid.org/0000-0003-2672-5264 |
| work_keys_str_mv | AT parkjeewoo twophotonpathwaytoultracoldgroundstatemoleculesofsuperscript23nasuperscript40k AT willsebastian twophotonpathwaytoultracoldgroundstatemoleculesofsuperscript23nasuperscript40k AT zwierleinmartinwolfram twophotonpathwaytoultracoldgroundstatemoleculesofsuperscript23nasuperscript40k |