Resonant Photovoltaic Effect in Doped Magnetic Semiconductors

Bhalla, Pankaj; MacDonald, Allan H.; Culcer, Dimitrie

doi:10.1103/physrevlett.124.087402

Cited by 52 publications

(24 citation statements)

References 103 publications

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“…In the present study, bilayer MnBi 2 Te 4 is non-gyrotropic, hence it has vanishing MSC. Nevertheless, MSC in gyrotropic magnetic materials is worth for a further exploration which is closely related to magnetic bulk phototactic 31 . It should be noted that the term of "magnetic" nonlinear current defined in the MSC and MIC in Eqs.…”

Section: Microscopic Theory Of Second-order Nonlinear Photocurrentmentioning

confidence: 99%

Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials

Wang

Qian

2020

npj Comput Mater

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Nonlinear photocurrent in time-reversal invariant noncentrosymmetric systems such as ferroelectric semimetals sparked tremendous interest of utilizing nonlinear optics to characterize condensed matter with exotic phases. Here we provide a microscopic theory of two types of second-order nonlinear direct photocurrents, magnetic shift photocurrent (MSC) and magnetic injection photocurrent (MIC), as the counterparts of normal shift current (NSC) and normal injection current (NIC) in time-reversal symmetry and inversion symmetry broken systems. We show that MSC is mainly governed by shift vector and interband Berry curvature, and MIC is dominated by absorption strength and asymmetry of the group velocity difference at time-reversed ±k points. Taking $${\cal{P}}{\cal{T}}$$ P T -symmetric magnetic topological quantum material bilayer antiferromagnetic (AFM) MnBi2Te4 as an example, we predict the presence of large MIC in the terahertz (THz) frequency regime which can be switched between two AFM states with time-reversed spin orderings upon magnetic transition. In addition, external electric field breaks $${\cal{P}}{\cal{T}}$$ P T symmetry and enables large NSC response in bilayer AFM MnBi2Te4, which can be switched by external electric field. Remarkably, both MIC and NSC are highly tunable under varying electric field due to the field-induced large Rashba and Zeeman splitting, resulting in large nonlinear photocurrent response down to a few THz regime, suggesting bilayer AFM-z MnBi2Te4 as a tunable platform with rich THz and magneto-optoelectronic applications. Our results reveal that nonlinear photocurrent responses governed by NSC, NIC, MSC, and MIC provide a powerful tool for deciphering magnetic structures and interactions which could be particularly fruitful for probing and understanding magnetic topological quantum materials.

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Section: Microscopic Theory Of Second-order Nonlinear Photocurrentmentioning

confidence: 99%

Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials

Wang

Qian

2020

npj Comput Mater

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“…The recently discovered nonlinear Hall effect 1 – 22 is a new member of the Hall family 23 – 26 . It is characterized by a nonlinear transverse voltage (or current) in response to two ac currents (or electric fields).…”

Section: Introductionmentioning

confidence: 99%

Quantum theory of the nonlinear Hall effect

Wang

Sun

et al. 2021

Nat Commun

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The nonlinear Hall effect is an unconventional response, in which a voltage can be driven by two perpendicular currents in the Hall-bar measurement. Unprecedented in the family of the Hall effects, it can survive time-reversal symmetry but is sensitive to the breaking of discrete and crystal symmetries. It is a quantum transport phenomenon that has deep connection with the Berry curvature. However, a full quantum description is still absent. Here we construct a quantum theory of the nonlinear Hall effect by using the diagrammatic technique. Quite different from nonlinear optics, nearly all the diagrams account for the disorder effects, which play decisive role in the electronic transport. After including the disorder contributions in terms of the Feynman diagrams, the total nonlinear Hall conductivity is enhanced but its sign remains unchanged for the 2D tilted Dirac model, compared to the one with only the Berry curvature contribution. We discuss the symmetry of the nonlinear conductivity tensor and predict a pure disorder-induced nonlinear Hall effect for point groups C3, C3h, C3v, D3h, D3 in 2D, and T, Td, C3h, D3h in 3D. This work will be helpful for explorations of the topological physics beyond the linear regime.

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“…However, it offers a glimpse into the distinct features that the driven current shows. In contrast, theoretical studies on the impurity effects in the bulk photovoltaic effect mainly focus on the cases with extended Bloch waves, such as relaxation time dependence (16) and impurity-mediated photovoltaic effect (21)(22)(23)(24)(25).…”

mentioning

confidence: 99%

Theory of bulk photovoltaic effect in Anderson insulator

Ishizuka

Nagaosa

2021

Proc. Natl. Acad. Sci. U.S.A.

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The localization of wavefunction by disorder makes a conductive material an insulator with vanishing conductivity at zero temperature. A similar outcome is expected for the photocurrent in semiconductor p-n junctions because the photoexcited carriers cannot drift through the device. In contrast, we here show numerically that the bulk photovoltaic effect—the photovoltaic effect in noncentrosymmetric bulk materials—occurs in a noncentrosymmetric, disordered, one-dimensional insulator where all eigenstates are localized. We find this photocurrent remains, even when the energy scale of random potential is larger than the bandwidth. On the other hand, the photocurrent decays exponentially when the excitation is local, i.e., when only a part of the device is illuminated. The photocurrent also vanishes if the relaxation occurs only by contact with the electrodes. Our result implies that the ratio of the photovoltaic current and the direct current by the variable-range hopping increases with decreasing temperature. These results suggest a route to design high-efficiency solar cells and photodetectors.

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Resonant Photovoltaic Effect in Doped Magnetic Semiconductors

Cited by 52 publications

References 103 publications

Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials

Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials

Quantum theory of the nonlinear Hall effect

Theory of bulk photovoltaic effect in Anderson insulator

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