Twisted particle collisions: A new tool for spin physics

Иванов, И. П.; Korchagin, Nikolai; Pimikov, A. V.; Zhang, P. M.

doi:10.1103/physrevd.101.096010

Cited by 16 publications

(13 citation statements)

References 42 publications

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“…The generation of vortex beams as twisted photons [1], vortex neutrons [2], or vortex electrons has inspired versatile theoretical studies and interesting experiments or proposals to unveil the basic properties of such beams and of effects of quantum interference and coherence in particle collisions, inaccessible with ordinary beams [3][4][5][6][7][8][9]. Quantized vortex electrons-i.e., electron beams carrying a quantized orbital angular momentum (OAM)-generated in electron microscopes [10][11][12] can be applied as probes for the study of chiral [13] or magnetic structures [14] and enable magnetic mapping with atomic resolution [15].…”

Section: Introductionmentioning

confidence: 99%

“…[5]), e.g., by means of spiral phase plates [10], holographic diffraction gratings [11], or the interaction with a magnetic needle, which mimics an approximate magnetic monopole [16]. The low efficiency and the limited flexibility of these methods hampers, however, the broad application of vortex beams for explorations of the atomic structure of matter and of fundamental interactions beyond a plane-wave approximation [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Quantum mechanical formulation of the Busch theorem

Floettmann

Karlovets

2020

Phys. Rev. A

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Due to the conservation of the canonical angular momentum, charged particle beams which are generated inside a solenoid field acquire a kinetic angular momentum outside of the solenoid field. The relation of kinetic orbital angular momentum to the field strength and the beam size on the cathode is called the Busch theorem. We formulate the Busch theorem in quantum mechanical form and discuss the generation of quantized vortex beams, i.e., beams carrying a quantized orbital angular momentum. Immersing a cathode in a solenoid field presents an efficient and flexible method for the generation of electron vortex beams, while, e.g., vortex ions can be generated by immersing a charge stripping foil in a solenoid field. Both techniques are utilized at accelerators for the production of nonquantized vortex beams. As a highly relevant use case we discuss in detail the conditions for the generation of quantized vortex beams from an immersed cathode in an electron microscope. General possibilities of this technique for the production of vortex beams of other charged particles are pointed out.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantum mechanical formulation of the Busch theorem

Floettmann

Karlovets

2020

Phys. Rev. A

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“…Relativistic vortex beams of electrons, muons, hadrons, heavy ions, nuclei, etc. can open up new prospects for atomic and nuclear physics, for high-energy physics with an emphasis on hadronic and spin studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. While twisted atoms and molecules with a projection of orbital angular momentum (OAM) onto the propagation axis have recently been generated [20], and means for producing the vortex (twisted) states of other massive particles are now being discussed [18], the available diffraction techniques [21][22][23][24][25] are very demanding to the spatial coherence of the beams and are hardly applicable for ultrarelativistic energies.…”

Section: Introductionmentioning

confidence: 99%

Generation of vortex particles via weak measurements

Karlovets¹,

Baturin²,

Geloni³

et al. 2022

Preprint

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While twisted photons with orbital angular momentum can be generated in several ways, their massive counterparts -vortex electrons, neutrons, or atoms -can be obtained so far only via diffraction techniques, not applicable for relativistic energies. Here we show that particles with phase vortices, including hadrons, ions, and nuclei, can be generated during emission in helical undulators, via Cherenkov radiation, in collisions with intense laser beams, in such scattering and annihilation processes as eµ → eµ, ep → ep, etc. We elucidate that the key element in obtaining them is not the process itself but the post-selection protocol due to quantum entanglement. A final particle acquires a phase vortex if the other final particle's momentum is weakly measured with no post-selection of its azimuthal angle. This technique can be used for generating all types of vortex particles, it can be adapted for ultrarelativistic beams of modern colliders for hadronic and spin studies, and it can also facilitate the development of sources of hard X-ray and γ-range twisted photons.

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“…Introduction. -The generation of electron vortex beams -i.e., electron beams carrying a quantized orbital angular momentum (OAM) -in electron microscopes [1][2][3] has inspired versatile theoretical studies and interesting experiments or proposals to unveil the basic properties of such beams, and to apply them as probes for the study of chiral [4] or magnetic structures [5] and of effects of quantum interference and coherence in particle collisions, inaccessible with ordinary beams [6][7][8][9][10][11]. The electron microscope community devised several methods to produce and analyze electron vortex beams (for a review see [8]), e.g., by means of spiral phase plates [1], holographic diffraction gratings [2], or by the interaction with a magnetic needle, which mimics an approximate magnetic monopole [12].…”

mentioning

confidence: 99%

Quantum mechanical formulation of the Busch theorem

Floettmann,

Karlovets

2020

Preprint

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Twisted particle collisions: A new tool for spin physics

Cited by 16 publications

References 42 publications

Quantum mechanical formulation of the Busch theorem

Quantum mechanical formulation of the Busch theorem

Generation of vortex particles via weak measurements

Quantum mechanical formulation of the Busch theorem

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