Vector polarons in a degenerate electron system

Clougherty, Dennis P.; Foell, Charles

doi:10.1103/physrevb.70.052301

Cited by 5 publications

(2 citation statements)

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“…Atomic units (@ m e 1) are used throughout. This is a continuum version of the pseudo-Jahn-Teller model with local symmetry A E , and it is similar to a recently studied continuum model that was shown to contain new kinds of multiorbital polarons (''vector polarons'') [8] that feature spatial variations of the vibronic mixing. It is demonstrated here using a variational argument that the model of Eq.…”

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Jahn-Teller Solitons, Structural Phase Transitions, and Phase Separation

Clougherty

2006

Phys. Rev. Lett.

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It is demonstrated that under common conditions a molecular solid subject to Jahn-Teller interactions supports stable Q-ball-like nontopological solitons. Such solitons represent a localized lump of excess electric charge in periodic motion accompanied by a time-dependent shape distortion of a set of adjacent molecules. The motion of the distortion can correspond to a true rotation or to a pseudorotation about the symmetric shape configuration. These solitons are stable for Jahn-Teller coupling strengths below a critical value; however, as the Jahn-Teller coupling approaches this critical value, the size of the soliton diverges signaling an incipient structural phase transition. The soliton phase mimics features commonly attributed to phase separation in complex solids.

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Jahn-Teller Solitons, Structural Phase Transitions, and Phase Separation

Clougherty

2006

Phys. Rev. Lett.

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“…Using a semi-classical continuum model of an electron in a deformable molecular crystal, the effects of electronic and vibrational degeneracy (and near degeneracy) on polaron structure have been investigated. With the inclusion of local Jahn-Teller couplings within the degenerate manifolds, a multicomponent polaron emerges as a solution of the semiclassical equations of motion [2].…”

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Polarons and solitons in Jahn–Teller systems

Clougherty

2007

Journal of Molecular Structure

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Using a semiclassical continuum model of an electron in a deformable molecular crystal, some properties of multicomponent generalizations of the polaron-"vector polarons"-are elucidated. Analytical solutions for the case of two electronic bands coupled to two vibrational modes are given in detail. Within the model considered, the vector polaron can be classified by its wavefunction into several types and can have features that include: (1) a spatial variation in the electronic and vibrational character, and (2) low-energy internal degrees of freedom. For the case of electronic and vibrational degeneracy, local Jahn-Teller interactions can also lead to a novel spatiotemporal soliton, a long-lived excited state of the many-electron system stabilized by the conservation law resulting from degeneracy.

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Manipulative Single Electric Dipole with Spontaneous Translational Symmetry Breaking in a Two-Dimensional Crystal

Hao,

Song,

Yang

et al. 2024

Nano Lett.

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It is widely acknowledged that quantum entities with minimal mass cannot undergo spontaneous symmetry breaking due to strong quantum fluctuations. Here, we report the discovery of a positionally settled single electric dipole that can be manipulated and electrically polarized in a monolayer CoCl 2graphite heterostructure, which demonstrates an unprecedented example of spontaneous lattice-translational-symmetry breaking. Scanning tunneling microscopy and atomic force microscopy show that the solitons are intrinsic paraelectric dipoles driven by synchronous charge−lattice distortion around individual CoCl 6 octahedrons. Both the dipole moment and lateral position of the soliton can be manipulated by the electric field exerted from the tip, which offers polarity-switchable and layout-designable electrostatic potential landscapes that determine the band bending configuration. This study exemplifies a brand-new type of local charge− lattice order, appealing for further research on the mechanism underlying the soliton robustness, and the electrically and positionally controllable single dipole supports the feasibility of band tailoring in device applications.

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Vector polarons in a degenerate electron system

Cited by 5 publications

References 20 publications

Jahn-Teller Solitons, Structural Phase Transitions, and Phase Separation

Jahn-Teller Solitons, Structural Phase Transitions, and Phase Separation

Polarons and solitons in Jahn–Teller systems

Manipulative Single Electric Dipole with Spontaneous Translational Symmetry Breaking in a Two-Dimensional Crystal

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