Sankar Das Sarma on Muck Rack

Sankar Das Sarma

  • Director, Condensed Matter Theory Center, University of Maryland, College Park
As seen in: Nature, New Scientist, Heise Online, MIT Technology Review, Physics APS, Physical Review B, RealClear Science
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Articles

Rabi and Ramsey oscillations of a Majorana qubit in a quantum dot-superconductor array

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By Haining Pan, Sankar Das Sarma, Chun-Xiao Liu
| Physical Review B
The Kitaev chain can be engineered within a quantum dot-superconductor array, hosting Majorana zero modes at fine-tuned sweet spots. In this work, we propose and simulate the occurrence of Rabi and Ramsey oscillations to feasibly construct a minimal Majorana qubit in the quantum dot setup. Our real-time results incorporate realistic effects, e.g., charge noise and leakage, reflecting the latest experimental progress.
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Long-Lived Topological Flatband Excitons in Semiconductor Moir\'e Heterostructures: A Bosonic Kane-Mele Model Platform

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By Ming Xie, Mohammad Hafezi, Sankar Das Sarma
| Physical Review B
Moiré superlattices based on two-dimensional transition metal dichalcogenides (TMDs) have emerged as a highly versatile and fruitful platform for exploring correlated topological electronic phases. One of the most remarkable examples is the recently discovered fractional quantum anomalous Hall effect (FQAHE) under zero magnetic field. Here, we propose a minimal structure that hosts long-lived excitons—a ubiquitous bosonic excitation in TMD semiconductors—with narrow topological bosonic bands.
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Self-consistent theory of fractional quantum anomalous Hall states in rhombohedral graphene

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By Ke Huang, XIAO LI, Sankar Das Sarma, fan zhang
| Physical Review B
Abstract The fractional quantum anomalous Hall (FQAH) effect in rhombohedral pentalayer graphene (PLG) has attracted significant attention due to its potential for observing exotic quantum states. In this work, we present a self-consistent Hartree-Fock theory for the FQAH effect in rhombohedral PLG. In particular, we focus on the convergence of the Hartree-Fock calculation with various reference fields and discuss the stability of the FQAH states in PLG.
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