Hall Anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YbB</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
: Evidence for Unconventional Charge Transport

Xiang, Ziji; Chen, Kuan-Wen; Chen, Lu; Asaba, Tomoya; Sato, Yuki; Zhang, Nan; Zhang, Dechen; Kasahara, Yuichi; Fumitoshi, Iga; Coniglio, William A.; Matsuda, Yuji; Singleton, John; Lü, Li

doi:10.1103/physrevx.12.021050

Cited by 15 publications

(8 citation statements)

References 130 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Importantly, the quantum oscillations in Fig. 2 are in good agreement with previous reports of SdH and de Haas–van Alphen quantum oscillations in both the insulating 18 , 29 , 30 and metallic states 19 , 20 of YbB 12 (see Supplementary Note 10 for additional comparisons with the literature). This demonstrates quantum oscillations in high-quality YbB 12 are a robust and reproducible phenomenon.…”

Section: Resultssupporting

confidence: 89%

The reverse quantum limit and its implications for unconventional quantum oscillations in YbB12

Mizzi,

Kushwaha,

Rosa

et al. 2024

Nat Commun

View full text Add to dashboard Cite

The quantum limit in a Fermi liquid, realized when a single Landau level is occupied in strong magnetic fields, gives rise to unconventional states, including the fractional quantum Hall effect and excitonic insulators. Stronger interactions in metals with nearly localized f-electron degrees of freedom increase the likelihood of these unconventional states. However, access to the quantum limit is typically impeded by the tendency of f-electrons to polarize in a strong magnetic field, consequently weakening the interactions. In this study, we propose that the quantum limit in such systems must be approached in reverse, starting from an insulating state at zero magnetic field. In this scenario, Landau levels fill in the reverse order compared to regular metals and are closely linked to a field-induced insulator-to-metal transition. We identify YbB12 as a prime candidate for observing this effect and propose the presence of an excitonic insulator state near this transition.

show abstract

Section: Resultssupporting

confidence: 89%

The reverse quantum limit and its implications for unconventional quantum oscillations in YbB12

Mizzi,

Kushwaha,

Rosa

et al. 2024

Nat Commun

View full text Add to dashboard Cite

show abstract

“…Importantly, the quantum oscillations in Fig. 2 are in good agreement with previous reports in both the insulating [20,31] and metallic states [21,22] of YbB 12 . This demonstrates quantum oscillations in high-quality YbB 12 are a robust and reproducible phenomenon.…”

supporting

confidence: 90%

The Reverse Quantum Limit: Implications for Unconventional Quantum Oscillations in YbB$_{12}$

Mizzi¹,

Kushwaha²,

Rosa³

et al. 2023

Preprint

View full text Add to dashboard Cite

Beyond the quantum limit, many-body effects are expected to induce unusual electronic phase transitions. Materials possessing metallic ground states with strong interactions between localized and itinerant electronic states are natural candidates for the realization of such quantum phases. However, the electronic correlations responsible for increasing the likelihood of novel phases simultaneously place the quantum limit beyond the reach of laboratory magnets. Here we propose these difficulties can be surmounted in materials with strong correlations and insulating ground states. Strong correlations in insulators and high magnetic fields conspire to fill Landau levels in the reverse order compared to conventional metals, such that the lowest Landau level is the first observed. Consequently, the quantum limit in strongly correlated insulators is reached in reverse and at fields accessible in laboratories. Quantum oscillations measured at high fields in YbB12 are shown to have features consistent with the reverse quantum limit. These include how quantum oscillations move in lock step with the angular evolution of the insulator-metal transition and the field dependence of the quantum oscillation frequency. We argue that close to the insulator-metal transition, the insulating state should be viewed through the lens of a magnetic field-induced electronic instability affecting the lowest Landau level states in the quantum limit.

show abstract

“…Ref. 4 reports both dHvA and SdH oscillations, ascribing their SdH data to the bulk, but it is not clear whether the dHvA data arise from the surface or the bulk ( 42 , 43 ). An additional complication in YbB 12 is the field-induced transitions in the insulating state ( 42 ) that make it hard to analyze quantum oscillations over a sufficiently broad field range.…”

Section: Discussionmentioning

confidence: 99%

Quantum oscillations in the magnetization and density of states of insulators

Panda

Banerjee

Randeria

2022

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

View full text Add to dashboard Cite

The observation of 1 / B -periodic behavior in Kondo insulators and semiconductor quantum wells challenges the conventional wisdom that quantum oscillations (QOs) necessarily arise from Fermi surfaces in metals. We revisit recently proposed theories for this phenomenon, focusing on a minimal model of an insulator with a hybridization gap between two opposite-parity light and heavy mass bands with an inverted band structure. We show that there are characteristic differences between the QO frequencies in the magnetization and the low-energy density of states (LE-DOS) of these insulators, in marked contrast to metals where all observables exhibit oscillations at the same frequency. The magnetization oscillations arising from occupied Landau levels occur at the same frequency that would exist in the unhybridized case. The LE-DOS oscillations in a disorder-free system are dominated by gap-edge states and exhibit a beat pattern between two distinct frequencies at low temperature. Disorder-induced in-gap states lead to an additional contribution to the DOS at the unhybridized frequency. The temperature dependence of the amplitude and phase of the magnetization and DOS oscillations are also qualitatively different and show marked deviations from the Lifshitz–Kosevich form well known in metals. We also compute transport to ensure that we are probing a regime with insulating upturns in the direct current (DC) resistivity.

show abstract

Hall Anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB12 : Evidence for Unconventional Charge Transport

Cited by 15 publications

References 130 publications

The reverse quantum limit and its implications for unconventional quantum oscillations in YbB12

The reverse quantum limit and its implications for unconventional quantum oscillations in YbB12

The Reverse Quantum Limit: Implications for Unconventional Quantum Oscillations in YbB$_{12}$

Quantum oscillations in the magnetization and density of states of insulators

Contact Info

Product

Resources

About