Magnetoresistance of a double-layer hybrid system in a tilted magnetic field

Parhizgar, Fariborz; Asgari, Reza

doi:10.1103/physrevb.90.035438

Cited by 6 publications

(2 citation statements)

References 43 publications

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“…44,69 In addition, it has recently been found that screening has a stronger effect on intra-layer properties than on inter-layer ones in double layer graphene systems. 70 Together these results clearly validates studying also the strong inter-surface pairing regime. Note though that we do not explicitly include the effects of electron-electron interactions.…”

Section: Inter-surface Spin-singlet Pairingsupporting

confidence: 67%

Highly tunable time-reversal-invariant topological superconductivity in topological insulator thin films

Parhizgar

Black‐Schaffer

2017

Sci Rep

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We study time-reversal-invariant topological superconductivity in topological insulator (TI) thin films including both intra- and inter-surface pairing. We find a nontrivial topology for multiple different configurations. For intra-surface pairing a π-phase difference between the intra-surface pairing states is required. We show that in this case the resulting topological phase is highly tunable by both an applied electric field and varied chemical potential. For spin-singlet inter-surface pairing, a sign-changing tunnel coupling present in many TI thin films is needed, and again, the topology can be tuned by electric field or doping. Notably, we find that the required inter-surface pairing strength for achieving nontrivial topology can still be subdominant compared to the intra-surface pairing. Finally, for spin-triplet inter-surface pairing we prove that the superconducting state is always topological nontrivial. We show that thin films of Cu-doped Bi2Se3 will likely host such spin-triplet inter-surface pairing. Taken together, these results show that time-reversal-invariant topological superconductivity is common in superconducting TI thin films and that the topological phase and its Kramers pair of Majorana edge modes is highly tunable with an applied electric field and varied chemical potential.

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Section: Inter-surface Spin-singlet Pairingsupporting

confidence: 67%

Highly tunable time-reversal-invariant topological superconductivity in topological insulator thin films

Parhizgar

Black‐Schaffer

2017

Sci Rep

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“…[9,10]. Thus we use a more exact screening function derived recently by many authors [6,23,26,27] using the Feynman diagram techniques for two-component systems. We only study the system immersed in the air and can thus consider the carrier-phonon interactions internally as in [7].…”

Section: Discussionmentioning

confidence: 99%

Screening effect on the phonon drag induced seebeck coefficient in bilayer graphene/quasi-two-dimensional electron gas structures

Van Tuan,

Khanh,

Van Tai

et al. 2024

Phys. Scr.

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In this work, we investigate the impacts of the temperature-dependent screening effect on the Seebeck coefficient originating from the phonon drag, namely phonon—drag thermopower S g , of a double layer system consisting of bilayer graphene (BLG) separated from a quasi-two-dimensional electron gas (q2DEG) by an air medium (hereafter referred to as BLG-q2DEG). For such a system, we can assume that the two-dimensional (2D) electrons in BLG only interact internally with acoustic phonons. We consider the effects of screening induced by the 2D electrons in q2DEG on the electron–phonon interactions in BLG by comparing with the results obtained when only using the monolayer screening function in BLG. The monolayer screening functions in BLG (q2DEG) do not depend on the distance d between the two layers, and the screening function of the double layer system approaches the respective monolayer screening functions for large d. When taking into account of the screening effect caused by charged carriers in both layers, S g of a BLG-q2DEG decreases compared to the case of only considering the monolayer screening effect, especially in the low-T regime. With different carrier densities in the two layers N s BLG ≠ N s GaAs , it has shown that S g strongly depends on BLG. Besides, when changing the width L of the q2DEG such as GaAs quantum well, the double layer screening function makes S g increase for small L and negligibly affects S g for large L. On the contrary, the monolayer screening functions make S g decrease for large L. The monolayer screening functions cause S g to increase for N s BLG < N s GaAs .

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Influence of dielectric environment on phase transition temperature of MLG-MLG graphene double layer system

Shah,

Ambavale,

Patel

et al. 2024

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Magnetoresistance of a double-layer hybrid system in a tilted magnetic field

Cited by 6 publications

References 43 publications

Highly tunable time-reversal-invariant topological superconductivity in topological insulator thin films

Highly tunable time-reversal-invariant topological superconductivity in topological insulator thin films

Screening effect on the phonon drag induced seebeck coefficient in bilayer graphene/quasi-two-dimensional electron gas structures

Influence of dielectric environment on phase transition temperature of MLG-MLG graphene double layer system

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