Spintronics Meets Density Matrix Renormalization Group: Quantum Spin-Torque-Driven Nonclassical Magnetization Reversal and Dynamical Buildup of Long-Range Entanglement

Petrović, Marko D.; Mondal, Priyanka; Feiguin, Adrian; Plecháč, Petr; Nikolić, Branislav K.

doi:10.1103/physrevx.11.021062

Cited by 17 publications

(23 citation statements)

References 62 publications

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“…These studies are often directly applicable to the investigation of dynamical properties of single-molecule magnets [35][36][37], magnetic impurities embedded in metallic hosts [35,[38][39][40][41][42][43] or even larger ferromagnetic systems whose dynamics can be represented by a single macrospin [18,44,45]. Nevertheless, no-less important is the insight that they provide into the dynamics of more complex magnetic structures [15,16,34,[46][47][48][49][50] and into the general interplay between localized magnetic moments and conduction electrons [50][51][52][53] relevant for spintronics applications [54][55][56][57].…”

Section: Introductionmentioning

confidence: 99%

“…This interplay was addressed by a broad range of methods. Important results have been obtained by fully quantum-mechanical approaches, including exact diagonalization [58][59][60], the time-dependent density-matrix renormalization group [7,31,57,61], nonequilibrium Green's functions (NEGF) [62][63][64][65] or ab initio calculations [29,[66][67][68][69][70]. Nevertheless, because of the complexity of the problem, classical methods still play a crucial role in this research area.…”

Section: Introductionmentioning

confidence: 99%

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Spin Dynamics in Magnetic Nano-Junctions

Smorka¹,

Žonda²,

Thoss³

2021

Preprint

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We investigate nonequilibrium processes in magnetic nano-junctions employing a numerical approach, which combines classical spin dynamics with the hierarchical equations of motion technique for the quantum dynamics of the conduction electrons. Focusing on the spin dynamics, we find that the spin relaxation rates depend in a non-monotonous way on the coupling between the localized spin and conduction electrons, with a pronounced maximum at intermediate coupling strength. This result can be understood by analyzing the local density of states. In the case of a magnetic junction subject to an external dc-voltage, spin relaxation exhibits resonant features reflecting the electronic spectrum of the system. In addition, in multi-site junctions, spin relaxation is also influenced by electron localization.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spin Dynamics in Magnetic Nano-Junctions

Smorka¹,

Žonda²,

Thoss³

2021

Preprint

View full text Add to dashboard Cite

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“…See, e.g., Refs. [216][217][218][219] and references therein for analysis beyond our linearized dilute magnon gas limit.…”

Section: Squeezed Statesmentioning

confidence: 99%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan,

Cao,

Kamra

et al. 2021

Preprint

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Spintronics and quantum information science are two promising candidates for innovating information processing technologies. The combination of these two fields enables us to build solid-state platforms for studying quantum phenomena and for realizing multi-functional quantum tasks. For a long time, however, the intersection of these two fields was limited due to the distinct properties of the classical magnetization, that is manipulated in spintronics, and quantum bits, that are utilized in quantum information science. This situation has changed significantly over the last few years because of the remarkable progress in coding and processing information using magnons. On the other hand, significant advances in understanding the entanglement of quasi-particles and in designing high-quality qubits and photonic cavities for quantum information processing provide physical platforms to integrate magnons with quantum systems. From these endeavours, the highly interdisciplinary field of quantum magnonics emerges, which combines spintronics, quantum optics and quantum information science. Here, we give an overview of the recent developments concerning the quantum states of magnons and their hybridization with mature quantum platforms. First, we review the basic concepts of magnons and quantum entanglement and discuss the generation and manipulation of quantum states of magnons, such as single-magnon states, squeezed states and quantum many-body states including Bose-Einstein condensation and the resulting spin superfluidity. We discuss how magnonic systems can be integrated and entangled with quantum platforms including cavity photons, superconducting qubits, nitrogen-vacancy centers, and phonons for coherent information transfer and collaborative information processing. The implications of these hybrid quantum systems for non-Hermitian physics and parity-time symmetry are highlighted, together with applications in quantum memories and high-precision measurements. Finally, we present an outlook on some of the challenges and opportunities in quantum magnonics.

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“…In the same way as in its ground state version, tDMRG relies on a matrix product state representation of the wave function plus a Suzuki-Trotter decomposition of the evolution operator to evolve the state [65][66][67][68][69]. Among other applications, it has been used to study time-dependent transport in a number of one-dimensional setups [81][82][83][84][85][86][87][88][89][90]. The formulation is extensively discussed in the cited literature, so we limit ourselves to a brief summary of the protocol used in this work.…”

Section: B Time-dependent Density Matrix Renormalization Groupmentioning

confidence: 99%

Transient dynamics of a magnetic impurity coupled to superconducting electrodes: exact numerics versus perturbation theory

Souto,

Feiguin,

Martín-Rodero

et al. 2021

Preprint

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Impurities coupled to superconductors offer a controlled platform to understand the interplay between superconductivity, many-body interactions, and non-equilibrium physics. In the equilibrium situation, local interactions at the impurity induce a transition between the spin-singlet to the spindoublet ground state, resulting in a supercurrent sign reversal (0 − π transition). In this work, we apply the exact time-dependent density matrix renormalization group method to simulate the transient dynamics of such superconducting systems. We also use a perturbative approximation to analyze their properties at longer times. These two methods agree for a wide range of parameters. In a phase-biased situation, the system gets trapped in a metastable state characterized by a lower supercurrent compared to the equilibrium case. We show that local Coulomb interactions do not provide an effective relaxation mechanism for the initially trapped quasiparticles. In contrast, other relaxation mechanisms, such as coupling to a third normal lead, make the impurity spin relax for parameter values corresponding to the equilibrium 0 phase. For parameters corresponding to the equilibrium π phase the impurity converges to a spin-polarized stationary state. Similar qualitative behavior is found for a voltage-biased junction, which provides an effective relaxation mechanism for the trapped quasiparticles in the junction.

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Spintronics Meets Density Matrix Renormalization Group: Quantum Spin-Torque-Driven Nonclassical Magnetization Reversal and Dynamical Buildup of Long-Range Entanglement

Cited by 17 publications

References 62 publications

Spin Dynamics in Magnetic Nano-Junctions

Spin Dynamics in Magnetic Nano-Junctions

Quantum magnonics: when magnon spintronics meets quantum information science

Transient dynamics of a magnetic impurity coupled to superconducting electrodes: exact numerics versus perturbation theory

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