Observation of Excitonic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi></mml:math>-Body Bound States: Polyexcitons in Diamond

Omachi, Junko; Suzuki, Takeshi; Kato, Koichi; Naka, N.; Yoshioka, Kosuke; Kuwata‐Gonokami, Makoto

doi:10.1103/physrevlett.111.026402

Cited by 31 publications

(28 citation statements)

References 22 publications

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“…Recently, a possible signature of Efimov physics in an excitonic system has been claimed to be observed [148]. In reference [148], N -body bound states of excitons, called poly-excitons, have been observed up to N = 6 by a photoluminescence measurement in a diamond crystal. The binding energies of these poly-exciton states were measured, and compared with those found in other crystals [153,154].…”

Section: Universal Few-body Physics With Excitonsmentioning

confidence: 99%

Efimov physics: a review

2017

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This article reviews theoretical and experimental advances in Efimov physics, an array of quantum few-body and many-body phenomena arising for particles interacting via short-range resonant interactions, that is based on the appearance of a scale-invariant three-body attraction theoretically discovered by Vitaly Efimov in 1970. This three-body effect was originally proposed to explain the binding of nuclei such as the triton and the Hoyle state of carbon-12, and later considered as a simple explanation for the existence of some halo nuclei. It was subsequently evidenced in trapped ultra-cold atomic clouds and in diffracted molecular beams of gaseous helium. These experiments revealed that the previously undetermined three-body parameter introduced in the Efimov theory to stabilise the three-body attraction typically scales with the range of atomic interactions. The few- and many-body consequences of the Efimov attraction have been since investigated theoretically, and are expected to be observed in a broader spectrum of physical systems.

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Section: Universal Few-body Physics With Excitonsmentioning

confidence: 99%

Efimov physics: a review

2017

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“…It is also expected to occur in solid-state physics [23,24]. This universality stems from the effective three-body attraction that occurs between particles interacting with nearly resonant short-range interactions.…”

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confidence: 97%

Microscopic Origin and Universality Classes of the Efimov Three-Body Parameter

2014

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The low-energy spectrum of three particles interacting via nearly resonant two-body interactions in the Efimov regime is set by the so-called three-body parameter. We show that the three-body parameter is essentially determined by the zero-energy two-body correlation. As a result, we identify two classes of two-body interactions for which the three-body parameter has a universal value in units of their effective range. One class involves the universality of the three-body parameter recently found in ultracold atom systems. The other is relevant to short-range interactions that can be found in nuclear physics and solid-state physics.The Efimov effect is a universal low-energy quantum phenomenon, which was originally predicted in nuclear physics [1] and has rekindled considerable interest since its experimental confirmation with ultracold atoms . It is also expected to occur in solid-state physics [23,24]. This universality stems from the effective three-body attraction that occurs between particles interacting with nearly resonant short-range interactions. As a result of this attraction, three particles may bind even when the interaction is not strong enough to bind two particles. Furthermore, an infinite series of such three-body bound states exists near the unitary point where the interaction is resonant, i.e. where a two-body bound state appears and the s-wave scattering a length diverges. The typical three-body energy spectrum for such systems is represented in Fig. 1 in units of inverse length. Near zero energy and large scattering lengths, the three-body spectrum is invariant under a discrete scaling transformation by a universal factor e π/s0 ≈ 22.7 for identical bosons, where s 0 ≈ 1.00624 characterises the strength of the three-body attraction.A notable consequence of the Efimov effect is the existence of another physical scale beyond the two-body scattering length to fix the low-energy properties of the system. This scale is known as the three-body parameter. In zero-range models, it manifests itself as the necessity to introduce a momentum cutoff or a three-body boundary condition. It can be characterised, for instance, by the scattering length a − at which a trimer appears or by its binding wave number κ at unitarity, as indicated in Fig. 1. Because of the discrete scaling invariance, it is defined up to a power of e π/s0 . In this Letter, we will focus on the ground Efimov state, which slightly deviates from the discrete-scaling-invariant structure, but is more easily observed and computed, and still reveals the essence of the physics behind the three-body parameter.Three important questions can be raised concerning the three-body parameter. Is there a simple mechanism that determines the three-body parameter from the microscopic interactions? What is the microscopic length scale which determines the three-body parameter? Finally, if there is such a length scale, what are the conditions for the three-body parameter to be related to that length scale through a universal dimensionless constant,

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“…c) (). Although the electron–hole liquid is generally more stable at high density and low temperature, polyexcitons appear under specific density and temperature conditions with a 400–500 ps rise time (). Photo‐injection near the transverse‐acoustic phonon‐assisted absorption edge (

h ν < 5.55

eV) of excitons was most effective in reducing the formation of electron–hole droplets and

T_{ex}

.…”

Section: Electron–hole System In Diamond Under Photo‐injectionmentioning

confidence: 99%

“…Therefore, it is important to understand the exciton diffusivity, free‐carrier mobility, and their relationship. Besides excitons, various complexes such as polyexcitons (), electron–hole plasmas, and electron–hole liquid () are formed in photoexcited diamond, and coexist with excitons in an early time window (<10 ns). We take an advantage of time‐resolved spectroscopy to achieve a temporal and spectral separation of exciton contributions.…”

Section: Introductionmentioning

confidence: 99%

Excitons and fundamental transport properties of diamond under photo‐injection

Naka

Morimoto

Akimoto

2016

Physica Status Solidi (a)

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Abstractauthoren Exciton diffusivity and carrier mobility are key features in determining transport properties of a material. The optimum values required for high‐performance devices are expected to be realized in undoped intrinsic materials. Diamond, one of the emergent high‐mobility materials, has a wide band gap suited for use in power electronics and optoelectronics. For many years, however, mobility measurement for diamond has been limited by carrier freezing at deep impurity levels. Recently, attempts at utilizing photoexcited carriers in undoped diamond have been made in a wide temperature range and various excitation schemes. A series of investigations demonstrated a wealth of intriguing observations such as dominant role of excitons and emergence of low‐temperature anomaly in momentum relaxation. This article highlights recent experimental advances and progresses in understanding transport properties of photoexcited intrinsic diamond.

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Observation of ExcitonicN-Body Bound States: Polyexcitons in Diamond

Cited by 31 publications

References 22 publications

Efimov physics: a review

Efimov physics: a review

Microscopic Origin and Universality Classes of the Efimov Three-Body Parameter

Excitons and fundamental transport properties of diamond under photo‐injection

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