Control of spin dynamics with laser pulses: Generation of entangled states of donor-bound electrons in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Cd</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>Te quantum well

Bao, Jiming; Bragas, Andrea V.; Furdyna, J. K.; Merlín, R.

doi:10.1103/physrevb.71.045314

Cited by 21 publications

(22 citation statements)

References 74 publications

(123 reference statements)

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“…The SOC is essential for this process. The existence of this effect is confirmed by the observations of very related processes in quantum wells 33 and quantum dots [34][35][36] with an applied external magnetic field in the Voigt geometry. …”

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confidence: 66%

Theoretical investigation of the inverse Faraday effect via a stimulated Raman scattering process

2012

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We study theoretically the origin and mechanism of the ultrafast inverse Faraday effect, which is a magnetooptical effect, attracting much interest nowadays. Laser-induced subpicosecond spin dynamics in hydrogenlike systems and isolated many-electron atoms are investigated in order to get insight into this process. We show that the stimulated Raman scattering process leads to a change of the magnetic state of a system. We obtain the time evolution of the induced magnetization, its dependencies on laser properties, and the connection with the spin-orbit coupling of a system. DOI: 10.1103/PhysRevB.85.094419 PACS number(s): 75.78. Jp, 78.20.Ls, 75.60.Jk, 42.65.Dr INTRODUCTIONUltrafast optical control of the magnetic state of a medium has recently become a subject of intense research in modern magnetism.1,2 The manipulation of a magnetic order by subpicosecond laser pulses is challenging for the development of novel concepts for high-speed magnetic recording, information processing, and data storage. And at the same time, it reveals fundamental questions on magnetization dynamics and makes it possible to understand the fascinating physics of processes, which happen on subpicosecond time scales.A set of experiments has revealed a direct subpicosecond optical control on magnetization via the inverse Faraday effect, i.e., the process of the generation of a magnetic field by nonlinear polarized light. [3][4][5] In these experiments circularly polarized high-intensity laser pulses several tens of femtoseconds long are used to excite a magnetic system of a sample. [6][7][8][9][10][11][12][13][14] It was shown that such laser pulses act as an effective magnetic field in oxidic materials, which are weak ferromagnets 6-10 and even compensated antiferromagnets 12 and paramagnets. 13 However, the mechanisms of laser-induced magnetization dynamics are still poorly understood in spite of much experimental [6][7][8][9][10][11][12][13][14][15][16][17][18] and theoretical [19][20][21][22][23][24][25][26][27] effort. One of the open questions is the evolution of the magnetic momentum of a medium excited by a laser pulse. 18,21,24 It cannot be answered without the knowledge of the laserinduced transitions, which lead to the change of the magnetic state of a system in the inverse Faraday effect experiments. In order to get a detailed insight into such transitions, we study the stimulated Raman scattering process, which has been suggested to be responsible for this effect. 4,9,20 In this process a laser pulse stimulates an optical transition from the ground state to a virtual excited state, which is split due to some interaction, for example, the spin-orbit coupling. Then the transition back to the ground state is stimulated. But due to the transition to the virtual state, the magnetic state of the electron brought back to the ground state is changed. We simulate this process in our systems at the femtosecond time scale and describe the mechanism of how optical transitions, excited by circularly polarized light, can lead to a change of...

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confidence: 66%

Theoretical investigation of the inverse Faraday effect via a stimulated Raman scattering process

2012

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“…The sample was placed in a magnetic cryostat and immersed in liquid He. Our material system, the same one used by Bao et al [3,4] large bandgap antiferromagnetic 19-Å-thick MnTe barriers. Although their concentration is rather small, the Mn ions lead to a large enhancement of the electron g-factor in the wells [11].…”

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confidence: 98%

“…The quantum entanglement discussed here involves the spin component of the wavefunction of a pair of electrons bound to donors, tentatively identified as In. Their estimated concentration is 5×10 16 cm −3 [3,4].…”

Section: Methodsmentioning

confidence: 99%

“…Examples include the spin degrees of freedom of donors and acceptors [1], and excitons in quantum dots [2]. In an earlier study, Bao et al [3,4] reported on the exciton-mediated spin entanglement of up to three bound electrons in a CdMnTe quantum well. The exciton and the resulting entanglement were created and probed by ultrafast laser pulses.…”

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confidence: 98%

“…In recent years, tailored ultrafast optical pulses have been applied to a wide variety of systems to control vibrations [5], chemical reactions [6], and electronic excitations [7]. Here, we use shaped pulses to control the spin quantum state of an ensemble of electron pairs bound to nearby donors in the same system studied previously by Bao et al [3,4].…”

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Coherent control of bound entangled electrons in a CdMnTe quantum well

Jacobs¹,

Furdyna

Merlín

2008

Phys. Status Solidi (c)

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Ultrafast laser pulses were used to control the spin state of a pair of entangled, donor‐bound electrons in a CdMnTe quantum well. The entanglement, mediated by an optically‐excited exciton, was characterized by pumpprobe spectroscopy. The data exhibits two dominant oscillations, one at the frequency of the spin‐flip of a donor electron and the second one at twice this frequency. Their amplitudes depend linearly on the pump power. The quantum state of the two‐electron spin system can be controlled by appropriate spatial and temporal shaping of the pump pulses. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Band-Offset Engineering in Magnetic/Non-Magnetic Semiconductor Quantum Structures

Furdyna

Lee

Dobrowolska

et al. 2010

Introduction to the Physics of Diluted Magnetic Semiconductors

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Control of spin dynamics with laser pulses: Generation of entangled states of donor-bound electrons in aCd1−xMnxTe quantum well

Abstract: A quantum-mechanical many-particle system may exhibit non-local behavior in that measurements performed on one of the particles can affect a second one that is far apart. These so- -3 -

Cited by 21 publications

References 74 publications

Theoretical investigation of the inverse Faraday effect via a stimulated Raman scattering process

Theoretical investigation of the inverse Faraday effect via a stimulated Raman scattering process

Coherent control of bound entangled electrons in a CdMnTe quantum well

Band-Offset Engineering in Magnetic/Non-Magnetic Semiconductor Quantum Structures

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