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Laser Cooling, Optical Trapping and Zeeman-Sisyphus Deceleration of Heavy Polyatomic Molecules for Probing Physics Beyond the Standard Model
Laser Cooling, Optical Trapping and Zeeman-Sisyphus Deceleration of Heavy Polyatomic Molecules for Probing Physics Beyond the Standard Model
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103602
- ISBN
- 9798280714038
- DDC
- 530
- 서명/저자
- Laser Cooling, Optical Trapping and Zeeman-Sisyphus Deceleration of Heavy Polyatomic Molecules for Probing Physics Beyond the Standard Model
- 발행사항
- [Sl] : Harvard University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 131 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
- 주기사항
- Advisor: Doyle, John M.
- 학위논문주기
- Thesis (Ph.D.)--Harvard University, 2025.
- 초록/해제
- 요약Ultracold polyatomic molecules containing heavy nuclei, such as SrOH and YbOH, are sensitive to T- symmetry violating and P-symmetry violating physics beyond the Standard Model through the electron's electric dipole moment. Furthermore, SrOH is sensitive to ultralight Dark Matter through measuring time variations of fundamental constants. However, in order to make full use of these molecules, they need to be cooled to ultracold temperatures and held in optical traps. We have realized a magneto-optical trap (MOT) of SrOH and used this as the essential element to achieve optical trap- ping in the microKelvin temperature regime. We observed MOT lifetimes approaching 200 ms with temperatures ∼ 1 mK and observed damped oscillations in the MOT. We further cooled the SrOH molecules to ∼ 40 μK using Λ-enhanced gray molasses, and compressed the cloud to about 100 μm size using the conveyor belt MOT technique. Using this ultracold dense cloud of SrOH, we loaded an optical dipole trap (ODT), with a molecular lifetime of 1.2(1) seconds. In separate experiments with YbOH, which is heavier than SrOH, we demonstrated a novel deceleration method (Zeeman- Sisyphus deceleration) that can slow YbOH to under 20 m/s with only a few photons scattered utilizing high magnetic fields up to 2.5 T. By driving spin-flip transitions at the maxima and minima of the magnetic fields, slowing was achieved, which is a critical first step toward loading of a MOT for this species. We addressed the challenges associated with driving spin-flip transitions in molecules that have molecular perturbations among the electronic excited states and developed an understanding of the physics of such systems that is applicable to a wide range of molecules.
- 일반주제명
- Physics
- 일반주제명
- Applied physics
- 일반주제명
- Optics
- 키워드
- Laser cooling
- 키워드
- Optical trapping
- 기타저자
- Harvard University Physics
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798280714038
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aSawaoka, Hiromitsu.▼0(orcid)0000-0003-4657-1303
■24510▼aLaser Cooling, Optical Trapping and Zeeman-Sisyphus Deceleration of Heavy Polyatomic Molecules for Probing Physics Beyond the Standard Model
■260 ▼a[Sl]▼bHarvard University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a131 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-12, Section: B.
■500 ▼aAdvisor: Doyle, John M.
■5021 ▼aThesis (Ph.D.)--Harvard University, 2025.
■520 ▼aUltracold polyatomic molecules containing heavy nuclei, such as SrOH and YbOH, are sensitive to T- symmetry violating and P-symmetry violating physics beyond the Standard Model through the electron's electric dipole moment. Furthermore, SrOH is sensitive to ultralight Dark Matter through measuring time variations of fundamental constants. However, in order to make full use of these molecules, they need to be cooled to ultracold temperatures and held in optical traps. We have realized a magneto-optical trap (MOT) of SrOH and used this as the essential element to achieve optical trap- ping in the microKelvin temperature regime. We observed MOT lifetimes approaching 200 ms with temperatures ∼ 1 mK and observed damped oscillations in the MOT. We further cooled the SrOH molecules to ∼ 40 μK using Λ-enhanced gray molasses, and compressed the cloud to about 100 μm size using the conveyor belt MOT technique. Using this ultracold dense cloud of SrOH, we loaded an optical dipole trap (ODT), with a molecular lifetime of 1.2(1) seconds. In separate experiments with YbOH, which is heavier than SrOH, we demonstrated a novel deceleration method (Zeeman- Sisyphus deceleration) that can slow YbOH to under 20 m/s with only a few photons scattered utilizing high magnetic fields up to 2.5 T. By driving spin-flip transitions at the maxima and minima of the magnetic fields, slowing was achieved, which is a critical first step toward loading of a MOT for this species. We addressed the challenges associated with driving spin-flip transitions in molecules that have molecular perturbations among the electronic excited states and developed an understanding of the physics of such systems that is applicable to a wide range of molecules.
■590 ▼aSchool code: 0084.
■650 4▼aPhysics
■650 4▼aApplied physics
■650 4▼aOptics
■653 ▼aFundamental physics
■653 ▼aLaser cooling
■653 ▼aMolecular spectroscopy
■653 ▼aOptical trapping
■653 ▼aPrecision measurement
■653 ▼aUltracold molecules
■690 ▼a0605
■690 ▼a0752
■690 ▼a0215
■71020▼aHarvard University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-12B.
■790 ▼a0084
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357806▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
