Anomalous de Haas–van Alphen Effect in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>InAs</mml:mi><mml:mo>/</mml:mo><mml:mi>GaSb</mml:mi></mml:mrow></mml:math>
 Quantum Wells

Knolle, Johannes; Cooper, N. R.

doi:10.1103/physrevlett.118.176801

Cited by 38 publications

(26 citation statements)

References 33 publications

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“…It is worth noting too that QOs are a thermodynamic quantity and can arise in circumstances far departed from a conventional FL state. It has been shown theoretically, for example, that QOs can exist even in band-insulators [71] as well as in strongly interacting, quantum critical non-FLs [72]. Hence, the observation of QOs is no longer viewed as a 'smoking gun' for the existence of a fully coherent Fermi surface.…”

Section: Discussionmentioning

confidence: 99%

Possible superconductivity from incoherent carriers in overdoped cuprates

et al. 2021

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There is now compelling evidence that the normal state of superconducting overdoped cuprates is a strange metal comprising two distinct charge sectors, one governed by coherent quasiparticle excitations, the other seemingly incoherent and characterized by non-quasiparticle (Planckian) dissipation. The zero-temperature superfluid density n_s(0)ns(0) of overdoped cuprates exhibits an anomalous depletion with increased hole doping pp, falling to zero at the edge of the superconducting dome. Over the same doping range, the effective zero-temperature Hall number n_{\rm H}(0) transitions from pp to 1 + pp. By taking into account the presence of these two charge sectors, we demonstrate that in the overdoped cuprates Tl_22Ba_22CuO_{6+\delta}6+δ and La_{2-x}2−xSr_xxCuO_44, the growth in n_s(0)ns(0) as pp is decreased from the overdoped side may be compensated by the loss of carriers in the coherent sector. Such a correspondence is contrary to expectations from conventional BCS theory and implies that superconductivity in overdoped cuprates emerges uniquely from the sector that exhibits incoherent transport in the normal state.

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Section: Discussionmentioning

confidence: 99%

Possible superconductivity from incoherent carriers in overdoped cuprates

et al. 2021

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“…This result is an important prediction of our theory. It contrasts clearly with quantum oscillations in clean insulators that lack in-gap states, where the amplitude of magnetization oscillation exhibits non-monotonous temperature dependence [8] or deviates from LK factors [22], and the oscillation of thermally averaged density of states exhibits thermal activation behavior and drops to zero, instead of saturates, in the zero temperature limit [9,11,22].…”

mentioning

confidence: 86%

“…Intriguingly, recent experiments found quantum oscillations in heavy fermion materials SmB 6 [4,5] and YbB 12 [6,7], which are Kondo insulators with a small energy gap. The physical origin of these quantum oscillations in insulators is hotly debated [8][9][10][11][12][13][14][15][16][17][18][19].…”

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confidence: 99%

Quantum Oscillation from In-Gap States and a Non-Hermitian Landau Level Problem

2018

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Motivated by recent experiments on Kondo insulators, we theoretically study quantum oscillations from disorder-induced in-gap states in small-gap insulators. By solving a non-Hermitian Landau level problem that incorporates the imaginary part of electron's self-energy, we show that the oscillation period is determined by the Fermi surface area in the absence of the hybridization gap, and we derive an analytical formula for the oscillation amplitude as a function of the indirect band gap, scattering rates, and temperature. Over a wide parameter range, we find that the effective mass is controlled by scattering rates, while the Dingle factor is controlled by the indirect band gap. We also show the important effect of scattering rates in reshaping the quasiparticle dispersion in connection with angle-resolved photoemission measurements on heavy fermion materials.

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“…In real materials, however, sharp peaks will be smeared by interactions and disorder [39][40][41][42][43] , and sufficiently low temperature would be required for an experiment. At the same time, signal amplitudes would be reduced at low temperature, which is a common subtle issue also for observables where only states near the chemical potential contribute 17,44 . Nevertheless, quantum oscillations in static longitudinal transport have indeed been observed not only in YbB 12 but also in band inverted insulating quantum wells at low temperature 4,45,46 , and discussed theoretically 21 .…”

Section: Cyclotron Resonancementioning

confidence: 99%

Cyclotron resonance in Kondo insulator

Tada

2020

Preprint

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Motivated by the recent experimental observations of quantum oscillations in the Kondo insulators SmB6 and YbB12, we study magneto-optical conductivity of Kondo insulators. We show that there exist non-trivial cyclotron resonance peaks in a frequency domain below the hybridization gap as a result of the characteristic Landau level structure of the system. Furthermore, these low energy peaks are enhanced near the insulator-metal phase transition driven by an applied magnetic field and stable even at low temperatures. They are smoothly connected via Kondo effect to resonance peaks for unhybridized conduction and f -electrons at high temperature. The non-trivial cyclotron resonance is a dynamical counterpart of quantum oscillations in static quantities, and through this intimate connection it will provide a useful insight for the latter.

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Anomalous de Haas–van Alphen Effect in InAs/GaSb Quantum Wells

Cited by 38 publications

References 33 publications

Possible superconductivity from incoherent carriers in overdoped cuprates

Possible superconductivity from incoherent carriers in overdoped cuprates

Quantum Oscillation from In-Gap States and a Non-Hermitian Landau Level Problem

Cyclotron resonance in Kondo insulator

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