Angular-Momentum Transfer Mediated by a Vibronic-Bound-State

Yun Yi Pai; Claire E. Marvinney; Ganesh Pokharel; Jie Xing; Haoxiang Li; Xun Li; Michael Chilcote; Matthew Brahlek; Lucas Lindsay; Hu Miao; Athena S. Sefat; David Parker; Stephen D. Wilson; Jason S. Gardner; Liangbo Liang; Benjamin J. Lawrie

doi:10.1002/advs.202304698

Angular-Momentum Transfer Mediated by a Vibronic-Bound-State

Yun Yi Pai, Claire E. Marvinney, Ganesh Pokharel, Jie Xing, Haoxiang Li, Xun Li, Michael Chilcote, Matthew Brahlek, Lucas Lindsay, Hu Miao, Athena S. Sefat, David Parker, Stephen D. Wilson, Jason S. Gardner, Liangbo Liang, Benjamin J. Lawrie

Research output: Contribution to journal › Article › peer-review

Abstract

The notion that phonons can carry pseudo-angular momentum has many major consequences, including topologically protected phonon chirality, Berry curvature of phonon band structure, and the phonon Hall effect. When a phonon is resonantly coupled to an orbital state split by its crystal field environment, a so-called vibronic bound state forms. Here, a vibronic bound state is observed in NaYbSe₂, a quantum spin liquid candidate. In addition, field and polarization dependent Raman microscopy is used to probe an angular momentum transfer of ΔJ_z = ±ℏ between phonons and the crystalline electric field mediated by the vibronic bound stat. This angular momentum transfer between electronic and lattice subsystems provides new pathways for selective optical addressability of phononic angular momentum via electronic ancillary states.

Original language	English
Article number	2304698
Journal	Advanced Science
Volume	11
Issue number	2
DOIs	https://doi.org/10.1002/advs.202304698
State	Published - Jan 12 2024

Funding

The authors would like to acknowledge insightful discussion with Michael A. McGuire, Allen Scheie, Xinshu Zhang, Yi Luo, Cristian Batista, Alan Tennant, and Vyacheslav Bryantsev. This research was sponsored by the U. S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Some of the first‐principles phonon calculations and all of the variable‐temperature, zero‐field Raman microscopy were performed at the Center for Nanophase Materials Sciences, which is a U.S. Department of Energy Office of Science User Facility. S.D.W. and G.P. acknowledge support by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under award DE‐SC0017752. Postdoctoral research support was provided by the Intelligence Community Postdoctoral Research Fellowship Program at the Oak Ridge National Laboratory, administered by Oak Ridge Institute for Science and Education through an interagency agreement between the U.S. Department of Energy and the Office of the Director of National Intelligence.

Funders	Funder number
Intelligence Community Postdoctoral Research
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Oak Ridge Institute for Science and Education
Office of the Director of National Intelligence
Division of Materials Sciences and Engineering	DE‐SC0017752

Keywords

Raman microscopy
phonon circularity
quantum spin liquid
vibronic bound state

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10.1002/advs.202304698

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title = "Angular-Momentum Transfer Mediated by a Vibronic-Bound-State",

abstract = "The notion that phonons can carry pseudo-angular momentum has many major consequences, including topologically protected phonon chirality, Berry curvature of phonon band structure, and the phonon Hall effect. When a phonon is resonantly coupled to an orbital state split by its crystal field environment, a so-called vibronic bound state forms. Here, a vibronic bound state is observed in NaYbSe2, a quantum spin liquid candidate. In addition, field and polarization dependent Raman microscopy is used to probe an angular momentum transfer of ΔJz = ±ℏ between phonons and the crystalline electric field mediated by the vibronic bound stat. This angular momentum transfer between electronic and lattice subsystems provides new pathways for selective optical addressability of phononic angular momentum via electronic ancillary states.",

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AU - Pai, Yun Yi

AU - Marvinney, Claire E.

AU - Pokharel, Ganesh

AU - Xing, Jie

AU - Li, Haoxiang

AU - Li, Xun

AU - Chilcote, Michael

AU - Brahlek, Matthew

AU - Lindsay, Lucas

AU - Miao, Hu

AU - Sefat, Athena S.

AU - Parker, David

AU - Wilson, Stephen D.

AU - Gardner, Jason S.

AU - Liang, Liangbo

AU - Lawrie, Benjamin J.

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AB - The notion that phonons can carry pseudo-angular momentum has many major consequences, including topologically protected phonon chirality, Berry curvature of phonon band structure, and the phonon Hall effect. When a phonon is resonantly coupled to an orbital state split by its crystal field environment, a so-called vibronic bound state forms. Here, a vibronic bound state is observed in NaYbSe2, a quantum spin liquid candidate. In addition, field and polarization dependent Raman microscopy is used to probe an angular momentum transfer of ΔJz = ±ℏ between phonons and the crystalline electric field mediated by the vibronic bound stat. This angular momentum transfer between electronic and lattice subsystems provides new pathways for selective optical addressability of phononic angular momentum via electronic ancillary states.

KW - Raman microscopy

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Angular-Momentum Transfer Mediated by a Vibronic-Bound-State

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