Helical multiferroics for electric field controlled quantum information processing

Azimi, M.; Chotorlishvili, L.; Mishra, S. K.; Greschner, Sebastian; Vekua, T.; Berakdar, J.

doi:10.1103/physrevb.89.024424

Cited by 31 publications

(33 citation statements)

References 97 publications

(103 reference statements)

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“…Thus, the low-energy excitations are electromagnons. A possible MBL phase has a multiferroic nature and is controllable by a magnetic B field (we assumed it applied along the z axis) or an electric field E (applied below along the y axis) that couples to P. Such a scenario is well captured by the low-energy, effective spin-1/2 Hamiltonian with a dynamical DM interaction [18,35]:…”

Section: Helical Spin-1/2 Heisenberg Modelmentioning

confidence: 99%

Many-body localization phase in a spin-driven chiral multiferroic chain

et al. 2017

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Many-body localization (MBL) is an emergent phase in correlated quantum systems with promising applications, particularly in quantum information. Here, we unveil the existence and analyze this phase in a chiral multiferroic model system. Conventionally, MBL occurrence is traced via level statistics by implementing a standard finite-size scaling procedure. Here, we present an approach based on the full distribution of the ratio of adjacent energy spacings. We find a strong broadening of the histograms of counts of these level spacings directly at the transition point from MBL to the ergodic phase. The broadening signals reliably the transition point without relying on an averaging procedure. The fast convergence of the histograms even for relatively small systems allows monitoring the MBL dynamics with much less computational effort. Numerical results are presented for a chiral spin chain with a dynamical DzyaloshinskiiMoriya interaction, an established model to describe the spin excitations in a single-phase spin-driven multiferroic system. The multiferroic MBL phase is uncovered and it is shown how to steer it via electric fields.

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Section: Helical Spin-1/2 Heisenberg Modelmentioning

confidence: 99%

Many-body localization phase in a spin-driven chiral multiferroic chain

et al. 2017

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“…The material parameters we used are typical of FeGe, but the results obtained are of a general nature and not limited to a certain material only. For example, because of the sizable magnetoelectric coupling in the one phase chiral multiferroic systems [28][29][30][31], the strength of the DMI can be controlled by means of the applied external electric field.…”

Section: Effect Of Dmi On Magnetic Domains and Dwsmentioning

confidence: 99%

Thermally induced magnonic spin current, thermomagnonic torques, and domain-wall dynamics in the presence of Dzyaloshinskii-Moriya interaction

et al. 2016

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Thermally activated domain-wall (DW) motion in magnetic insulators has been considered theoretically, with a particular focus on the role of Dzyaloshinskii-Moriya interaction (DMI) and thermomagnonic torques. The thermally assisted DW motion is a consequence of the magnonic spin current due to the applied thermal bias. In addition to the exchange magnonic spin current and the exchange adiabatic and the entropic spin transfer torques, we also consider the DMI-induced magnonic spin current, thermomagnonic DMI fieldlike torque, and the DMI entropic torque. Analytical estimations are supported by numerical calculations. We found that the DMI has a substantial influence on the size and the geometry of DWs, and that the DWs become oriented parallel to the long axis of the nanostrip. Increasing the temperature smoothes the DWs. Moreover, the thermally induced magnonic current generates a torque on the DWs, which is responsible for their motion. From our analysis it follows that for a large enough DMI the influence of DMI-induced fieldlike torque is much stronger than that of the DMI and the exchange entropic torques. By manipulating the strength of the DMI constant, one can control the speed of the DW motion, and the direction of the DW motion can be switched, as well. We also found that DMI not only contributes to the total magnonic current, but also it modifies the exchange magnonic spin current, and this modification depends on the orientation of the steady-state magnetization. The observed phenomenon can be utilized in spin caloritronics devices, for example in the DMI based thermal diodes. By switching the magnetization direction, one can rectify the total magnonic spin current.

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“…A further central point is the appropriate working substance. We identified multiferroics (MF) and in particular magnetoelectrics nanostructures as promising candidates 16,17 . MFs possess intrinsically coupled order parameters such as elastic, magnetic, and ferroelectric orders [18][19][20][21][22][23][24][25][26] and can be well integrated in electronic circuites (in particular in oxide-based electronics).…”

Section: Introductionmentioning

confidence: 99%

“…Hence, an engine based on a MF substance performs magnetic, electric and possibly (via piezoelectricity) mechanical works, at the same time. A particularly interesting case is that of a quantum spiral magnetoelectric substance 16,17 .…”

Section: Introductionmentioning

confidence: 99%

Superadiabatic quantum heat engine with a multiferroic working medium

et al. 2016

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A quantum thermodynamic cycle with a chiral multiferroic working substance such as LiCu2O2 is presented. Shortcuts to adiabaticity are employed to achieve an efficient, finite time quantum thermodynamic cycle which is found to depend on the spin ordering. The emergent electric polarization associated with the chiral spin order, i.e. the magnetoelectric coupling, renders possible steering of the spin order by an external electric field and hence renders possible an electric-field control of the cycle. Due to the intrinsic coupling between of the spin and the electric polarization, the cycle performs an electro-magnetic work. We determine this work's mean square fluctuations, the irreversible work, and the output power of the cycle. We observe that the work mean square fluctuations are increased with the duration of the adiabatic strokes while the irreversible work and the output power of the cycle show a non-monotonic behavior. In particular the irreversible work vanishes at the end of the quantum adiabatic strokes. This fact confirms that the cycle is reversible. Our theoretical findings evidence the existence of a system inherent maximal output power. By implementing a Lindblad master equation we quantify the role of thermal relaxations on the cycle efficiency. We also discuss the role of entanglement encoded in the non-collinear spin order as a resource to affect the quantum thermodynamic cycle.

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Helical multiferroics for electric field controlled quantum information processing

Cited by 31 publications

References 97 publications

Many-body localization phase in a spin-driven chiral multiferroic chain

Many-body localization phase in a spin-driven chiral multiferroic chain

Thermally induced magnonic spin current, thermomagnonic torques, and domain-wall dynamics in the presence of Dzyaloshinskii-Moriya interaction

Superadiabatic quantum heat engine with a multiferroic working medium

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